How to prevent pests and diseases in Adenium obesum? Good ventilation and dry air are key
When growing Adenium obesum, although pests and diseases are not common, flower lovers should still fully understand them to avoid being at a loss when pests and diseases appear, otherwise it will not only slow the growth of Adenium obesum, but also cause it to fail to bloom or the whole plant to die. Below, let us learn about the pest and disease control methods for Adenium obesum.
Pest prevention for Adenium obesum
1. Scale insects
They mainly harm the leaves and branches of Adenium obesum, and are one of the most important pests in Adenium obesum pest and disease control. They cause symptoms such as yellowing leaves, withered branch tips, and declining growth, and may also trigger sooty mold and so on.
[Prevention]: Regularly turn the soil and repot, pay attention to reasonable fertilizing and watering to improve its resistance to scale insects, and pay attention to timely pruning. For methods, refer to the detailed introduction in the Adenium obesum pruning methods illustration.
[Treatment]: When scale insects appear, before they have formed, use a 1000-fold dilution of 40% omethoate, spraying once every 7 days, 2-3 times is enough; when the damage is relatively severe, use an insecticide made by mixing 40% omethoate emulsifiable concentrate and 80% dichlorvos emulsifiable concentrate in a 1:1 ratio and spray 2-3 times.
2. Leaf roller caterpillars
The larvae feed on the leaf mesophyll of Adenium obesum and remain in the leaf veins and upper epidermis, causing grayish-brown thin films to appear on the leaves. The adults are usually brown or yellowish-brown and are extremely harmful to the leaves of Adenium obesum.
[Prevention]: Keep the environment ventilated, avoid excessive environmental humidity, pay attention to drainage during the rainy season, and move it indoors to a ventilated place for care.
[Treatment]: When they are larvae, spray a 1500-fold dilution of 60% dimethoate emulsifiable concentrate, or a 1000-fold dilution of 50% phoxim emulsifiable concentrate.
Disease control for Adenium obesum
1. Soft rot
[Symptoms]: In the early stage of the disease, the outer leaves appear wilted and drooping, but recover to normal on cloudy days; the plant's leaves dry up over a large area, and water-soaked lesions appear at the base of the stem, with the lesion color being a pale grayish-yellow.
[Disease pattern]: The pathogen overwinters in soil and compost, invades the plant through wounds with the help of wind and rain, absorbs nutrients between the cells of the wound, and spreads and reproduces from spring to autumn.
[Control]: When planting, the soil needs to be healthy and clean; in the early stage of the disease, spray with a 1000-fold dilution of Dexon original powder or an 800-fold dilution of 38% oxadixyl-cymoxanil-kresoxim-methyl.
2. Leaf spot disease
[Symptoms]: Blackish-brown original spots appear on the leaves, then expand into irregular patches, the edges of the lesions rise slightly, and small black dots arranged irregularly appear on both sides of the leaves.
[Disease pattern]: The pathogen overwinters in diseased residues or on the soil surface, spreads with wind and rain the following year, and occurs severely during high summer temperatures. It is related to excessive planting density, poor ventilation, and excessive humidity.
[Control]: Good ventilation must be maintained in the Adenium obesum environment, and environmental humidity should not be too high; dry air is more favorable for the growth of Adenium obesum; when the disease occurs, spray with 400-600-fold 80% mancozeb, 500-fold 50% captan, etc.
Adenium obesum cultivation methods_Adenium obesum pictures
Adenium obesum is also called Tianbao flower, and is a succulent plant in the genus Adenium of the Apocynaceae family, also known as a succulent plant. It is a succulent shrub and small tree plant, with a plant height generally of 4.5 m, and the trunk is swollen in shape. The leaves of Adenium obesum are simple and alternate, growing at the branch tips, with an obovate and elliptical shape, a length of 15 cm, entire margins, blunt apex, and also with a short point, rather fleshy, and growing without petioles. Below, let us take a look at the cultivation methods of Adenium obesum and an introduction to Adenium obesum pictures.
[Adenium obesum pictures—morphological characteristics]
Adenium obesum is a succulent shrub and small tree plant, shaped like a small trumpet, and the flower color is rose red, very vivid. The inflorescence is umbrella-shaped, brilliant like brocade, and it blooms continuously throughout the year. The leaves of Adenium obesum are simple and alternate, obovate in shape, with an acute apex, a length of 8-10 cm, and a width of 2-4 cm. The leaves are leathery, very glossy, and the corolla colors include white, bicolor, rose red, pink, etc. The flowering period is from May to December, and the flower colors include red, rose red, pink, white, etc. In southern regions it is mainly planted in greenhouses and will produce abundant fruit, with seeds that are white and covered with fine hairs.
[Adenium obesum pictures—growth habits]
Adenium obesum likes to grow in environments with sufficient light, drought, high temperature, and so on. It grows in sandy soil rich in calcium, loose, well-aerated, and well-drained. Adenium obesum's cold resistance and shade tolerance are very good. It avoids waterlogging, concentrated fertilizer, and raw fertilizer in its growing environment, is afraid of cold, and is suitable for growing in an environment of 25-30°C. If grown at home, it needs to be placed in a place with sufficient sunlight or diffused light for cultivation. Its flowering period is from May to December, and the flower colors include pink, white, rose red, red, etc. In southern regions, planting in greenhouses makes it relatively sturdy.
[Adenium obesum pictures—propagation methods]
Adenium obesum mainly uses cutting propagation, grafting propagation, layering propagation, and seed propagation. Cutting propagation is generally carried out in summer, and 1-2-year-old branches can be selected for cuttings. For grafting, oleander is used as the rootstock, and the cleft grafting method is used during the attack; after survival, the plant grows very luxuriantly and the flowers bloom very brilliantly. Layering propagation is also carried out in summer, generally using the air layering method in summer, and roots can generally form in about one month, while potting can be done in one and a half months. The seed propagation method is also carried out in summer, and the suitable germination temperature is 21°C.
[Cultivation methods of Adenium obesum]
1. Light: Giving sufficient light is more conducive to the flowering of Adenium obesum. During vigorous growth, carry out appropriate shading treatment, and during dormancy, also give appropriate light.
2. Temperature: Adenium obesum likes to grow in an environment with sufficient light and ventilation. In the summer in southern regions, Adenium obesum is in its growth period, with an average temperature of 30°C, and this temperature is very favorable for the growth of Adenium obesum. In winter, Adenium obesum's cold resistance is very poor, so it should be placed indoors for cultivation.
3. Watering: Do not place Adenium obesum in a humid environment to grow. Even during the growth period, there should not be too much water. Water only when the potting soil is completely dry. During the growth period, avoid adding [water] excessively, otherwise the plant will be threatened by pests and wither.
4. Fertilizing: Summer belongs to the growth period of Adenium obesum, and during the growth period sufficient fertilizer should be given, which is more conducive to the growth of Adenium obesum. Adenium obesum grows relatively slowly, so some slow-release fertilizer can be applied, and decomposed compost can be applied. During the autumn dormancy period, the growth rate of Adenium obesum will also slow down or stop, so fertilizing should be stopped.
5. Pruning: If you want the plant shape of Adenium obesum to be very beautiful, pruning work is very important. If pruning management is not carried out normally and it is allowed to grow leggy, it can very easily lose its ornamental value. Pruning after the flowering period is the best time, and you can also prune according to your own preferences.
6. Pest and disease prevention: The diseases that appear in Adenium obesum include leaf spot disease, which can be prevented by spraying with thiophanate. The pests encountered include the damage of scale insects and leaf roller caterpillars, which can be sprayed with fenitrothion.
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Adenium obesum Adenium obesum Adenium obesum illustrated guide: How to grow Adenium obesum / How to propagate Adenium obesum
Adenium obesum profileAdenium obesum Adenium obesum
Aliases: Tianbao flower, small oleander, wealth flower, Shahongji flower, Adam flower, dwarf frangipani
Classification: Succulent and succulent plants
Family and genus: Plantae, Angiosperms, Dicotyledons, Gentianales, Apocynaceae, Adenium
Full bloom period: Spring and autumn
Adenium obesum (scientific name: Adenium obesum) is a perennial succulent plant, with a plant height reaching up to 2 m.. It has multiple aliases, such as: Tianbao flower, wealth flower, Shahongji flower, Adam flower, dwarf frangipani, small oleander, and in Europe and America it is often called desert rose or desert azalea. It belongs to small trees, and in its place of origin it can grow to 2 m tall. The base of Adenium obesum is swollen, the fleshy stem is short and thick, and needle-shaped or obovate leaves alternate at the tips of stem branches. The upper surface of the leaves is dark green, and the underside is light green and relatively rough. The flowering period is from late spring to autumn, and the flowers are pink to red, forming umbel-like inflorescences, 2-10...
Cultivation methods and precautions for Adenium obesum Introduction to Adenium obesum
Adenium obesum (scientific name: Adenium obesum) is a perennial succulent plant, with a plant height reaching up to 2 m.. It has multiple aliases, such as: Tianbao flower, wealth flower, Shahongji flower, Adam flower, dwarf frangipani, small oleander, and in Europe and America it is often called desert rose or desert azalea. It belongs to small trees, and in its place of origin it can grow to 2 m tall. The base of Adenium obesum is swollen, the fleshy stem is short and thick, and needle-shaped or obovate leaves alternate at the tips of stem branches. The upper surface of the leaves is dark green, and the underside is light green and relatively rough. The flowering period is from late spring to autumn, and the flowers are pink to red, forming umbel-like inflorescences, with 2-10 flowers in a five-pointed funnel shape clustered at the branch tips.
The whole plant is toxic. If livestock or young children accidentally eat the stems, leaves, or sap, it can cause heart diseases such as accelerated heartbeat and arrhythmia.
Adenium obesum is a crystalline form of gypsum growing in low-lying desert areas. Its appearance closely resembles a rose, and it grows in the desert. Its root is swollen into a fleshy root, the stem is thick, there are many branches, and the leaves are emerald green. It is named desert rose because its place of origin is close to the desert and it is red like a rose. Therefore it is called desert rose. According to its growth form, it can be divided into single, connected, branched, and clustered forms. For size, the diameter of a single form is generally 1.5-10 cm, and connected forms are 10-50 cm or larger. It is one of the few flower-like minerals among natural stones and has high ornamental value. Because of the unique climatic conditions in the Inner Mongolia desert, this unique flower of the desert, the desert rose, grows; its appearance closely resembles a blooming bouquet of roses. It not only has unique ornamental value, but also represents love that never fades. There are also places of origin in China, such as in the Gobi Desert of Alxa League in Inner Mongolia.
Botanically, Adenium obesum is also called Tianbao flower, and is a succulent plant in the genus Adenium of the Apocynaceae family. It is native to Kenya and Tanzania in Africa, likes high temperature, dryness, and a sunny environment, tolerates severe heat, and is not cold-resistant. It is named desert rose because its place of origin is close to the desert and it is red like a rose; in mineralogy, desert rose is a gypsum-type crystal born in the desert, shaped like a blooming rose, with countless forms and wondrous beauty. Its main component is limestone, and because its formation geographical conditions are special, its output is scarce, making it a purely natural strange stone; desert rose is also the name of a popular pop song sung by Hong Wei, with lyrics by He Houhua and music by He Qiaoli.
Morphological characteristics of Adenium obesum
The flowers of Adenium obesum resemble small trumpets, rose red, and very beautiful. The umbel-like inflorescences form clusters of three to five, brilliant like brocade, blooming continuously through the four seasons. It is named desert rose because its place of origin is close to the desert and it is red like a rose.
The leaves of Adenium obesum are simple and alternate, obovate, with an acute apex, 8 cm-10 cm long and 2 cm-4 cm wide, leathery, glossy, dark green on the upper surface, grayish-green on the underside, and with entire margins. The raceme is terminal, bearing more than 10 flowers, trumpet-shaped, 6 cm-8 cm long; the corolla has 5 lobes, in rose red, pink, white, and bicolor, etc. May to December is the flowering period of Adenium obesum, and the flowers are red, rose red, pink, white, etc. Greenhouse cultivation in the south more easily produces fruit. The seeds have white fine hairs, which help them fly and disperse.
Tianbao flower is commonly called "desert rose", with the scientific name Adenium Obesum, and its place of origin is northeastern Africa. "Flower of Baimacheng" is in the same family but a different genus. Its flowers are bright red, and the multi-flowered variety is red outside and white inside, both shaped like small trumpets; the flower diameter is about four cm, and the flower color is very delicate and charming; the sap in its stem is slightly toxic, so when potted at home, care should be taken not to let children and pets swallow it. Its growth habits are similar to the commonly grown "bottle palm". The leaves are like long teaspoons, whorled near the top, just like a small umbrella shape; the leaves below its stem fall off, leaving one mark after another. Tianbao flower belongs to the succulent plants of the Apocynaceae family, all having curved tubers or tuberous roots, fleshy and enlarged, storing a large amount of water and nutrients, and therefore tolerant of drought and barren conditions. Tianbao flower likes heat and fears cold, and sometimes sheds leaves in winter to reduce water evaporation, which helps resist the cold; it itself enters a "hibernation" state, so it should not be watered or fertilized too much.
Ecological habits and growing environment of Adenium obesum
In the south, the flowering period is from May to August in the Gregorian calendar. It likes light and warmth; therefore, during the warm and humid growing period, sunlight is necessary to promote photosynthesis. Long-term excessive shade easily makes the branches and leaves soft and drooping, and it is then very difficult to bud flowers again. Sufficient sunlight can enable normal flower bud differentiation. It likes a high-temperature, dry, and sunny environment. It tolerates severe heat, is not cold-resistant, is drought-tolerant, and avoids waterlogging. Sandy loam rich in calcium and well-drained is suitable. In winter the temperature should not be lower than 10°C.
Perennial succulent plant, with a plant height reaching up to 2 m. It likes a dry, high-temperature, ventilated, and sunny environment, tolerates severe heat, and is not cold-resistant. It is drought-tolerant but not tolerant of waterlogging. Do not water too much each time; if there is more water, it very easily causes root rot, and the branches also grow leggy. A good sunlight environment instead helps Adenium obesum bloom. The root is swollen into a fleshy root. The stem is thick, and the leaves are emerald green.
Fern plants
Adenium obesum is a fern plant named "Selaginella tamariscina", very drought-tolerant. In the dry season it becomes withered and yellow, wilting, just like clumps of dried grass. When the water supply is sufficient, the branches and leaves stretch out and turn green again, so it is also called "resurrection plant", but it actually cannot bloom. This fern plant was first named in Long Yingtai's literary collection "Desert Rose", in which it is introduced: "Yes, in his eyes, it is not a rose, it is only a kind of lichen! No matter how beautiful a lichen is, how beautiful can it be? What he sees is an ugly, damp-smelling lower plant, placed in a big bowl." In fact, this naming comes from its resemblance, rather than actually being able to bloom flowers similar to roses.
Cultivation techniques for Adenium obesum
During cultivation, the branches of Adenium obesum easily grow leggy, affecting the beauty of the plant shape, and grafting can be used to change its plant shape. At a certain height of the plant, all branches can be cut off according to a certain shape, then take the upper ends of the cut branches and use the cleft grafting method for grafting. After grafting treatment, the plant shape is beautiful, and after flowering the flowering branches are compact and highly ornamental.
Adenium obesum is relatively drought-tolerant, and do not water too much each time. If there is more water, it very easily causes root rot, and the branches also grow leggy, making pruning rather troublesome. In high summer temperatures, water according to soil conditions. Generally water once every two or three days, and water must not accumulate in the pot. In winter when the temperature drops, Adenium obesum also enters a semi-dormant period. At this time, watering should be appropriately controlled, attention should be paid to keeping the soil dry, and watering once a week is enough. Appropriate drought is very favorable for the growth of Adenium obesum. (When Adenium obesum enters the dormant period in winter, the leaves will gradually fall off. This is normal leaf drop, and there is no need to be nervous about it.)
Adenium obesum relatively likes phosphorus and potassium fertilizers, and should be supplemented about once a month normally. During the vigorous summer growth period, sufficient fertilizer and water are needed, so that the flowers produced can be luxuriant and vivid. In addition, in combination with repotting once a year, some long-acting base fertilizer can also be appropriately applied in the pot, such as decomposed soybean cake, bone meal, etc.
Pruning art
The pruning work for Adenium obesum is also very important. If normal pruning is not paid attention to and it is allowed to grow leggy, it very easily loses its ornamental value. After the flowering period is the best time for pruning, and choices can be made according to personal preference. Note: More branches mean more flowers. If you want more flowers, you must find a way to keep more branch divisions.
Cultivation key points
Pot cultivation requires sufficient sunlight and good drainage. A mixed soil of fertile, loose sand and leaf mold is best. During the growth period it should be dry rather than wet. In high summer temperatures, water once a day, and normally water once every 2-3 days. Fertilize 2-3 times throughout the year. In the winter drought dormancy period, leaves normally fall. For planting, plant or repot in spring. In southern regions it can be planted in the ground and overwinter outdoors. In northern regions it should be potted and overwinter indoors. The potting soil can use equal parts leaf mold and coarse sand mixed, plus a small amount of decomposed dry bone meal. Before planting, put some broken tiles at the bottom of the pot to facilitate drainage. Repot every spring and replace with new cultivation soil. Newly planted and newly repotted plants can be placed indoors or in a shaded place for care, with less watering, and enter normal management after they recover.
Light and temperature
During the growth period, it should be placed outdoors in a place with sufficient sunlight, or it can be grown in a greenhouse, requiring sufficient light. In winter it needs to be brought indoors and sheltered in a sunny place; it is better if grown in a greenhouse. In winter, keep the indoor temperature above 12°C. If the potting soil is dry, it can also overwinter safely at a temperature of 7-8°C.
Watering and fertilizing
Spring and autumn are the vigorous growth periods, so water fully and keep the potting soil moist, but not overly wet. Water according to the principle of watering when dry and stopping when wet, and water thoroughly when completely dry. In early spring and late autumn, when temperatures are relatively low, watering should be restrained. In winter, reduce watering and keep the potting soil dry, but water if it becomes too dry. It does not need much fertilizer; during the growth period apply thin liquid fertilizer 1-2 times a month, and stop fertilizing in winter.
Adenium obesum relatively likes phosphorus and potassium fertilizers, and should be supplemented about once a month normally. During the vigorous summer growth period, sufficient fertilizer and water are needed, so that the flowers produced can be luxuriant and vivid. In addition, in combination with repotting once a year, some long-acting base fertilizer can also be appropriately applied in the pot, such as decomposed soybean cake, bone meal, etc.
Potting soil and repotting
Adenium obesum, like other succulent plants, likes sandy soil with good drainage. Therefore, when repotting, it is best to add more river sand or small gravel to ordinary soil, which can improve the drainage of the potting soil. Generally this is only needed when the plant has already grown quite luxuriantly. However, seedling-stage Adenium obesum should be repotted every year. The repotting method is very simple. First, before repotting, stop watering, then after the potting soil is completely dry, turn the plant out, remove the old potting soil and prune the root system, then replant.
Cultivation methods and care key points for Adenium obesum
Adenium obesum likes a dry and sunny environment, is drought-tolerant but not tolerant of waterlogging, and tolerates heat but not cold. The suitable growth temperature is 20-30°C. When cultivated at home, it should be placed in a place with sufficient sunlight or diffused light, and it is suitable to use fertile, loose, well-drained sandy loam rich in calcium. May to December is its flowering period, and the flowers are red, rose red, pink, white, etc. Greenhouse cultivation in the south more easily produces fruit.
Sunlight
Do not think that the seemingly delicate Adenium obesum cannot accept strong sunlight. In fact, a good sunlight environment instead helps Adenium obesum bloom. Apart from the vigorous growth period, even during the dormant period, Adenium obesum still needs sufficient sunlight to overwinter.
Temperature
Adenium obesum likes to grow in a high-temperature and ventilated environment. In the summer in the south, which is also the growth period of Adenium obesum, the average temperature is around 30°C, making it very suitable for growth in the south. In winter, because Adenium obesum has poor cold resistance, it should be moved indoors for cultivation and kept dry, so that Adenium obesum can bloom those beautiful flowers again in spring and summer.
Watering
The growth of Adenium obesum should avoid a humid environment. Even during the growth period, water should not be too much. Before each watering, it must be confirmed that the surface of the potting soil is completely dry. Do not water during the plant's dormant period, as this will only make the plant more susceptible to cold damage and withering.
During the growth period it should be dry rather than wet. In the high-temperature summer period, water according to soil conditions once the surface soil is dry. Generally water once every 3 days, and water must not accumulate in the pot, otherwise the roots easily rot. In the vigorous spring growth season each year, apply nitrogen fertilizer 2-3 times, and before flowering apply calcium- and phosphorus-containing compound fertilizer 2 times. In the winter drought season, the plant enters the dormant period. If the temperature is below 10°C, the leaves fall, and at this time watering should be controlled and the soil kept dry.
Fertilizing
The spring and summer rainy seasons each year are the growth period of Adenium obesum. Therefore, at this time fertilizer should be added slightly to sufficiently supplement the nutrients consumed during its growth. However, because the growth speed of Adenium obesum varies, it is better to use slow-release fertilizer, such as decomposed compost. As for autumn and winter, these are the dormant period of Adenium obesum, when its growth is very slow or even stops. Therefore, do not fertilize during this period.
Indoor potting
In summer, the potting soil should be kept moist, otherwise the leaves easily dry and curl; in the remaining seasons, it is better to keep it dry rather than wet; in winter, watering thoroughly once a week or once every ten days is enough.
During cultivation, the branches of Adenium obesum easily grow leggy, affecting the beauty of the plant shape, and grafting can be used to change its plant shape. At a certain height of the plant, all branches can be cut off according to a certain shape, then take the upper ends of the cut branches and use the cleft grafting method for grafting. After grafting treatment, the plant shape is beautiful, and after flowering the flowering branches are compact and highly ornamental. More branches mean more flowers. If you want more flowers, you must find a way to keep more branch divisions.
Propagation methods for Adenium obesum
Adenium obesum is commonly propagated by cuttings, grafting, and layering, and can also be sown. Adenium obesum is mainly propagated by sowing and cuttings.
Cuttings
Summer is best. Select 1-2-year-old branches, with tip branches being best, cut them into 10 cm lengths, wait for the cut surface to dry, then insert into a sand bed. After insertion, roots form in about 3-4 weeks. For grafting, use oleander as the rootstock, and use the cleft grafting method in summer. After survival, the plant grows robustly and easily blooms. For layering, the air layering method is often used in summer. Cut 2/3 into a robust branch, first fill with moss, then wrap with plastic film. Roots form in about 25 days, and after 45 days cut it off and pot it. Sow in summer, with a germination temperature of 21°C.
Whether flowers, leaves, stems, or its shape, all are elegant and unique, natural and generous, with a distinctive style, especially suitable for home interior and balcony decoration. When in full bloom, most of the leaves fall off, and the branches are full of flowers, with a beautiful posture. During cultivation, the branches of Adenium obesum easily grow leggy, affecting the beauty of the plant shape, and grafting can be used to change its plant shape. At a certain height of the plant, all branches can be cut off according to a certain shape, then take the upper ends of the cut branches and use the cleft grafting method for grafting. After grafting treatment, the plant shape is beautiful, and after flowering the flowering branches are compact and highly ornamental. More branches mean more flowers. If you want more flowers, you must find a way to keep more branch divisions.
Sowing
Spring is best. Use the spot sowing method to facilitate management after emergence. Before sowing, the substrate must be disinfected. After emergence, note that the substrate in the sowing tray must not be too wet, otherwise the roots may rot and cause the death of large numbers of seedlings. Cuttings are best taken in the vigorous growth season. Cut branch segments to about 10 cm, soak the lower ends in water, and dilute the sticky liquid at the cut surface to prevent gumming from affecting root development. They can be inserted into a sand bed or directly inserted into sterilized cultivation substrate, and roots can form in about 15-30 days. When propagating, it is recommended to use the sowing method, so that the plant's root and stem can naturally swell to form a good plant shape. Cutting seedlings cannot do this, and their ornamental value will also be greatly reduced.
Disease control for Adenium obesum Disease control
Sometimes there is damage from leaf spot disease, which can be sprayed with a 500-fold dilution of 50% thiophanate wettable powder. Pests include damage from scale insects and leaf roller caterpillars, which can be killed by spraying with a 1000-fold dilution of 50% fenitrothion emulsifiable concentrate. The main pest is scale insects. When the infestation is severe, it causes all leaves to fall off, the plant growth point to die, and even the plant to die. Home cultivation should be observed carefully; once discovered, immediately wipe them off with a cotton swab dipped in water. It can also be sprayed 1-2 times during the egg-laying and hatching periods with a 1000-2000-fold dilution of 40% omethoate emulsifiable concentrate, or a 1000-fold dilution of 50% fenitrothion emulsifiable concentrate. When carrying out pest and disease control, pay attention to medication safety.
Control techniques for soft rot
Adenium obesum soft rot is a major disease harming Adenium obesum. Adenium obesum has vivid flowers, luxuriant blooming, and a short and sturdy plant, especially the root and stem parts with an ancient and vigorous posture, making it an excellent succulent plant for tropical regions. It has been introduced into China for more than 10 years and grows well, but the occurrence and damage of its soft rot often causes the death of the entire plant.
1. Symptoms: Soft rot is a major disease of Adenium obesum. Adenium obesum develops water-soaked softening near the soil surface, initially white or pale yellow, and finally turning dark brown. Under moist conditions it cracks and rots and has a foul odor, with the internal tissue black, and when touched it is both sticky and soft.
2. Cause: Adenium obesum soft rot is mainly caused by high summer temperatures and muggy conditions, poor ventilation, or water accumulation in the pot.
① High summer temperatures, muggy conditions, poor ventilation, or exposure to rain are the key factors causing the occurrence of this disease.
② Watering too much during the growth period leaves the tubers and roots in a suffocated state, and root absorption capacity declines.
③ When potting or transplanting seedlings, planting too deep or piling too much soil around the root and stem area favors disease development. High humidity at the stem base favors pathogen reproduction and invasion, promoting the occurrence of the disease.
3. Control methods:
① When cultivating, choose well-drained, moderately fertile sandy loam. Use 3 parts coarse sand, 1 part leaf mold, plus a small amount of plant ash. Do not use garden soil as seedling soil.
② In order to prevent the occurrence of soft rot early, starting from the planting seedlings, first disinfect the potting soil for planting flowers. The soil must be disinfected with 0.5%-1% formalin solution, every square [meter], to prevent mutual infection. The depth is generally such that the seedling neck is slightly exposed above the surface, the stem neck of mature plants is exposed about 1/3 above the surface, and old tubers are exposed about 1/2 above the surface.
③ Watering: Normally do not water too much, to avoid the potting soil becoming too wet. Especially in the early stage after potting, pay attention to watering less. In hot weather, slightly moist is better. From early September, watering can be appropriately increased.
④ Chemical control: About once every month, spray with a 1000-fold dilution of agricultural streptomycin or 150-200-fold Bordeaux mixture.
Distribution area of Adenium obesum
Adenium obesum is native to Kenya and Tanzania in Africa. It is now distributed in North African countries such as Tunisia, Algeria, and Morocco.
Uses and ornamental value of Adenium obesum
Whether flowers, leaves, stems, or its shape, all are elegant and unique, natural and generous, with a distinctive style, especially suitable for home interior and balcony decoration. When in full bloom, most of the leaves fall off, and the branches are full of flowers, with a beautiful posture.
Whether flowers, leaves, stems, or its shape, Adenium obesum is elegant and unique, natural and generous, with a distinctive style, especially suitable for home interior and balcony decoration, and is an excellent product for indoor cultivation.
In the south, Adenium obesum can bloom twice, in spring and autumn. If cared for properly, flowers can be seen in all three seasons of spring, summer, and autumn. When in full bloom, most of the leaves fall off, and the branches are full of flowers. Its posture is beautiful, and the tree shape is ancient and vigorous, elegant and unique. The roots, stems, leaves, and flowers all have relatively high ornamental value, and it is currently a popular high-grade indoor cultivation product.
Landscape uses and garden design of Adenium obesum
Adenium obesum has a short plant and an ancient and vigorous tree shape, with roots and stems swollen like a wine bottle. It blooms twice each year in April-May and September-October. Bright red and beautiful, shaped like a trumpet, extremely unique, and deeply loved by people. In the south, ground planting to arrange small courtyards is simple and dignified, natural and generous. For potted ornamental use, decorating interiors and balconies is distinctive.
Cultural background and beautiful legend of Adenium obesum
According to legend, in the vast Gobi Desert, there is a kind of stone that has grown for tens of millions of years. It is the crystalline form of a plant. The seeds of this plant are naturally paired. After flowering, the roots and stems are connected, and the flowers are like roses; if one of them dies, the other no longer blooms and slowly withers... After countless years, their bodies and the sand crystallize into a peculiar flower, without life but never fading, becoming the "desert rose" symbolizing everlasting love.
Legend has it that in desert regions, roses are not easy to survive, so young local people often give desert rose stones instead on Valentine's Day.
Overview of the Mineral Species and Genus
Desert rose, also known as "gobi stone," "wind-carved stone," or "wind-polished stone," is mainly found in the vast Gobi. Desert roses are born in the riverbeds of ancient Ruoshui, mostly formed after volcanic magma cooled and then underwent long-term natural changes and sun-and-wind erosion, or formed from quartz sand condensed over tens of millions of years. Because of special geological conditions, they form into myriad shapes, magnificent and magical flowers within stone. The geographical conditions for the formation of desert roses are special, so yields are scarce, and among them those whose flower shape closely resembles a rose and that fully display floral characteristics are even rarer. The formation of desert roses bears witness to history. Not only can they be treasured for a lifetime, they can also be passed down to future generations, becoming a testament to generations of family happiness. Petal after petal of rose-like stone petals opens with lifelike realism; it is a masterpiece formed by fine sand weathering through thousands of years of wind and rain sculpting. There are also scattered grains of fine sand embedded in the middle of the petals. It has no rose leaves or thorns, only flowers, silently blooming in the Gobi desert. This rock's shape resembles a rose, hence it is called "desert rose." Desert rose: imbued with aesthetic sentiment, it strengthens appreciation of beauty, promotes associative power and imagination, benefits artistic creators, and can also serve as a gift for young men and women to express mutual affection and convey love.
Desert rose is a rare gemstone and commemorative stone, born in the desert. Its main components are calcium carbonate and quartz; it is a gypsum-type crystal, a flower within stone. Because the geographical conditions of its formation are special, its yield is scarce. Desert rose is shaped like a blooming rose, in myriad forms, magnificent and magical. It is a purely natural strange stone that can purify water quality and air, and has extremely high collection value and ornamental value.
Main Components
Desert rose is a symbiont of calcite, quartz, and hard transparent gypsum.
Origin and Distribution
Countries near the Sahara Desert, including Algeria, Libya, and others. It is also produced in desert regions of the United States, Mexico, Morocco, Canada, and other countries. There are also producing areas in China, such as in the Gobi Desert of Alxa League in Inner Mongolia.
Development and Utilization
Because desert rose is difficult to extract, scarce in yield, and peculiar in shape, it occupies a special position in the natural strange stone market and has extremely precious research and collection value. It has petal after petal of rose-like stone petals, opening with lifelike realism. It is formed by fine sand weathering through tens of millions or even hundreds of millions of years of wind and rain sculpting. There are also scattered grains of fine sand embedded in the middle of the petals. It has no rose leaves or thorns, only flowers silently blooming in the Gobi desert, but it will never wither or fade.
Desert Rose Images