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What are the morphological characteristics of oleander?
Evergreen shrub or small tree. Plant height 1.5-6 m, upright growth habit. Stems smooth, strongly branching; old branches grayish-brown, new branches purplish-brown or green. Leaves simple, whorled or opposite, lanceolate, 10-25 cm long, leathery, entire margins, midrib prominent; a small amount of white milky sap present in both branches and leaves. Cymes terminal; corolla funnel-shaped, 5-lobed, flower diameter 3-5 cm, in colors such as pink, deep red, red, and white. Single or double flowers, with a distinctive fragrance. Flowering period June-October. Follicle, elongated horn-shaped. Fruit ripening period December
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How to control oleander aphids? A full breakdown of practical methods
Oleander aphid, also known as the kapok aphid, belongs to the order Homoptera, family Aphididae. It is distributed throughout southern China, as well as in various countries of Southeast Asia, Africa, and South America. Damage symptoms: nymphs or aphids attack oleander, stunting the growth of affected new shoots, turning the upper and lower leaves black, and causing flower buds and flowers to develop incompletely and open abnormally, reducing ornamental value. Morphological characteristics: the wingless parthenogenetic female is oval in shape, 2.3 mm long, yellow like a banana peel. The frontal tubercles are raised, higher than the median frontal tubercle; the antennae are dark, with coarse tile-like sculpturing; the rostrum reaches the middle coxae. The cornicles are long and tubular, dark
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Detailed Explanation of Oleander Cultivation and Management Methods and Technical Key Points
Oleander, also known as yangtao, bannianhong, or liuyetao, originated in Iran and India. It is an evergreen shrub or small tree of the Apocynaceae family. Dwarf types suitable for pot cultivation reach 60-80 cm in height, while tall types can grow to over 3 m. It blooms from late May each year, and the flowering period is extremely long, lasting until October. Flower colors include peach red, pink, yellow, white, and others, with peach red being the most common. The flowers are double-petaled and have a delicate fragrance. Every year during the flowering season, green leaves set off red flowers, gorgeous and elegant, offering both foliage and flowers to admire, combining the beauty of peach and bamboo.
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Oleander Planting and Cultivation Methods and Key Technical Points
1. Planting time is in spring. Open-field cultivation in the Yellow River basin and areas to its south; container cultivation in cold northern regions, overwintering indoors. When transplanting, the plant must be planted with a soil ball. The planting site must be sunny and free of standing water. Summer transplanting is also possible, but some branches must be pruned off and an appropriate number of leaves cut away to reduce water transpiration and promote survival. For container plants, repot once every 2-3 years, using a growing medium of 6 parts leaf mold and 4 parts river sand; before planting, a horseshoe chip can also be placed at the bottom of the pot as a base fertilizer. Before planting, shorten the branches
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Harvesting and Fresh-Keeping Methods for Outdoor Oleander Cuttings
[Other Chinese Names]Dajiezhong, Jiaochudong, Jiujiezhong, Juna, Liuyetao, Shuigancao[Family and Genus]Apocynaceae, Nerium[Place of Origin]Nepal, India, Iran and other places[Plant Characteristics]Oleander is an evergreen shrub or small tree. Plant height 5-6 m. It has milky sap. Simple leaves are whorled or opposite, linear-lanceolate, 10-25 cm long, entire, leathery.[Cutting Harvest]The harvested part is the current-year branches of oleander. Harvesting should be carried out from May to July each year. In order to obtain ideal
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Diagnosis and Treatment of Oleander Poisoning in Cattle
Oleander is an ornamental plant, and many local farmers grow it. According to relevant literature, oleander contains cardiac glycosides, which have an irritant effect. After animals consume it, it can cause hemorrhagic gastroenteritis, increased sodium and calcium ion concentrations in myocardial cells, and decreased potassium ion concentration, thereby causing a series of pathological phenomena in animals such as atrial fibrillation and cardiac arrhythmia. I. Incidence Situation In July 2002, a 3-year-old yellow cow in Gumudi Town, Miquan City, consumed oleander in the yard. Two hours later, the cow showed abdominal pain, restlessness
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How should potted oleander be pruned and shaped
Oleander leaves are borne in whorls of three and it has typical three-forked branching: each time it is pruned, 3 new shoots grow from the stem nodes. People often use this branching trait to shape and prune it, so that each plant keeps 3 main branches on the trunk, and each main branch keeps 3 more branches, the tree form commonly known as "three forks and nine tops". After a potted oleander has established, the first pruning can generally be done according to the plant's height and personal preference, choosing and keeping a trunk of 30-40 cm and pinching it to encourage side branches. When the new shoots grow to 4-6 cm long, choose 3 appropriately positioned thick branches and remove the rest
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Medicinal Value and Floral Characteristics of Oleander
I. Origin: Apocynaceae (Nerium indicum Mill.). Also known as willow-leaf peach, half-year red, peach bamboo, pen peach. It was introduced to China for cultivation a very long time ago; as early as the Ming Dynasty's "Pingfang Pu" there are records of oleander. Although China is not the homeland of oleander, it has a cultivation history of more than 500 years to date. Growing oleander is not troublesome, so pot cultivation is very common in both the south and the north. In all areas south of the Yangtze River basin in China, it can be cultivated in the open field; in Chongqing it is close to a wild state, and can be seen everywhere.
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How to treat oleander leaf spot? Detailed methods for disease control in medicinal plants
Oleander, scientific name Nerium indicum Mill., is a woody plant of the family Apocynaceae. Its leaves and flowers are used as medicine; it is toxic. It has the effects of strengthening the heart and promoting diuresis, eliminating phlegm, and killing insects. It is distributed in most provinces and regions across the country. Symptoms mainly affect the leaves. At first, small purplish-red spots appear at the leaf tip or leaf margin, and after expanding they form circular, semicircular to irregular brown lesions. The lesions have concentric rings. In the later stage the center fades to white, and the red-brown margin is relatively wide. When humidity is high, a grayish-brown mold layer can grow on both sides of the lesions, namely the pathogen's conidiophores and conidia. The disease
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How to control oleander aphids? Aphid control methods for garden ornamental trees
Distribution and damage The oleander aphid Aphis nerii Boyer de Fonscolombe, also known as the oleander yellow aphid, belongs to the order Homoptera, family Aphididae. It is distributed in Changchun, Shenyang, Baotou, Taiyuan, Ningbo, Guiyang, Urumqi and other places. It pierces and sucks sap from the new shoots and young leaves of oleander plants, affecting normal plant growth and flowering. Morphological characteristics: wingless female aphid body length 2 mm, body apricot yellow, antennae dark brown, legs black, cauda tongue-shaped, with 11-14 curved hairs. Winged female aphid oval, head and thorax black,
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