A Complete Analysis of Methods and Techniques for Preventing and Controlling Pests and Diseases in Cymbidium ensifolium
1. Southern blight
Symptoms: Southern blight mostly occurs during the plum rain season, mainly harming the rhizome part of the plant, causing the roots to rot and die. There will be white fungal colonies on the soil surface, the plant gradually lodges, and the plant withers.
Solution: After the disease occurs, replace the soil promptly, sprinkle in lime, wash and cut off the diseased plant parts, disinfect them, pay attention to ventilation and air permeability, control the amount of watering, and the plant will slowly recover.
2. Scale insects
Symptoms: Scale insects are the main pest of Cymbidium ensifolium, mostly caused by a high-temperature, high-humidity, and poorly ventilated environment. Scale insects harm the branches of Cymbidium ensifolium, causing the leaves to turn yellow and the branches to wither.
Solution: You can choose to spray with a 1000-fold dilution of omethoate, or rinse with clean water, repeatedly washing two or three times.
That is all for the introduction to winter care methods and pest and disease prevention and control methods for Cymbidium ensifolium. Cymbidium ensifolium is lively and beautiful, so how could it not be loved? Everyone should hurry and grow a pot too.
How should Cymbidium ensifolium be cared for and managed, and what are the techniques for preventing and controlling pests and diseases in Cymbidium ensifolium?
Cymbidium ensifolium is a relatively good variety for home cultivation. So do you know what the care and management of Cymbidium ensifolium involve? What techniques are there for preventing and controlling pests and diseases in Cymbidium ensifolium? Today, the editor will chat with everyone about knowledge related to cultivating Cymbidium ensifolium.
Care and management
1. Light control and coolingCymbidium ensifolium grows best at an annual average temperature between 15-23°C. Summer temperatures are hot, so use a 70-80% plastic shade net to cool it down.
2、High temperatures promote cooling. For the high temperatures caused by excessive light, measures should be takento increase the layers and density of shading to promote cooling; in summer and autumn, when light is strong, the air is stuffy and hot, and temperatures are high, doors and windows should be opened to allow the air in the orchid site to fully circulate and promote cooling. Splashing clean water on the walkways and under the orchid benches, and spraying water mist into the indoor space, can also help lower the temperature.
3. Moisture retention and ventilation. Moisture retention and ventilation in the orchid site should be regulated to the most reasonable state to benefit orchid growth. To maintain air humidity, an advanced fully automatic humidifier can be used, and water mist can also be sprayed into the space, walkways, and under the orchid benches. Maintaining substrate moisture should be regulated according to conditions such as light, humidity, and ventilation. For soil cultivation, water once every 2-4 days, adhere to "better dry than wet," and the timing of watering should be adapted to local conditions. Wild orchids originate in mountain wilderness and secluded valleys, where the production area is open on all sides, but there is also shade from forest and grass, with breezes blowing from time to time, allowing long-term growth in an environment with fresh air. Therefore, the orchid site also needs to create these conditions for orchid growth. If the orchid site is relatively closed, more doors and windows should be added to promote air convection.
4. Heat preservation and freeze protection
Cymbidium ensifolium can only tolerate brief, intermittent low temperatures of -2 to -5°C under protective conditions that block wind and frost. Therefore, it should be kept warm in a greenhouse in winter, and if conditions permit, heating equipment can also be used.
5. Fertilization
Adopt the principle of "suiting measures to the orchid, determining fertilizer by the seedling condition, preferring dilute over concentrated, and applying lightly at the right time." That is, grasp the timing according to the orchid species, seedling vigor, and physiological characteristics. For dry fertilizer, use cow bone meal (containing 4% nitrogen, 22.06% phosphorus), plant ash (1.04% phosphorus, 6.41% potassium), cake fertilizer (7% nitrogen, 1.32% phosphorus, 2.12% potassium), and burned soil mixed fertilizer, used alternately with compound fertilizer, no fewer than 4 times per year in each pot. For liquid fertilizer, use filtered and diluted fully decomposed organic fertilizer, urea, monopotassium phosphate, or special flower fertilizer alternately as topdressing or foliar feeding, generally once every 15 days. When applying foliar spray, use clean water to spray the leaf surface once each on the two days before and after, to wash away dust and medicinal residue.
Fertilization times include:① Sprouting-promoting fertilizer(late spring and early summer): dry fertilizer once or twice, foliar feeding once every 10 days, mainly nitrogen and potassium fertilizer, to promote the emergence of aboveground stems and leaves and the expansion of the underground root system.② Development fertilizer(late summer and early autumn): when new bud leaves elongate and emerge, to promote robust new buds, mainly nitrogen, applied frequently and lightly; after the new buds open their leaves, mainly potassium to promote strong seedlings, spraying with monopotassium phosphate once a week.③ Flower-promoting fertilizer: When the new shoot leaves stop growing, the plant enters the flower bud differentiation stage, mainly phosphorus, dry fertilizer twice, foliar feeding once a week.④ Late autumn and early winter, from Cold Dew to Start of Winter, the orchid will enter dormancy. Apply dry fertilizer once, liquid fertilizer twice, and foliar spray once every 10 days, to ensure safe overwintering, accumulate reserves for flowering, and increase the sprouting rate the following spring.
Disease prevention and control
Anthracnose, black spot, and scale insect damage are common. For diseases, spray with a 500-fold dilution of 10% carbendazim wettable powder; for pests, spray with a 1500-fold dilution of 40% omethoate emulsifiable concentrate.
Pest and disease management of Cymbidium ensifolium during the flowering period
In the bright spring days of March, with bright spring light and flowers competing in beauty, the orchid nursery is full of vitality: the flower scape of Cymbidium ensifolium has already grown more than 20 cm, and the flowers are in bud ready to bloom. However, good times do not come, and good flowers are hard to open; the flower buds gradually shrivel. Only after cutting them open did we know they were already infested by pests, with stem borers wrapped inside. For this, the following treatment methods were adopted.
① Turn the orchid pot upside down and rinse the orchid roots with tap water. The inner walls of the leaf sheaths attached around the pseudobulb should especially be washed thoroughly; scrape off the dirt, and after drying, soak for 30 minutes in a 300-fold dilution of thiophanate-methyl and carbendazim (the solution should submerge above the pseudobulb), then dry in the shade and repot.
② Before repotting the diseased Cymbidium ensifolium plant, the planting material and orchid pot must be sterilized at high temperature. Cut off infected leaves, dead tips, and diseased roots. After potting the orchid plant, spray chemicals to eliminate pests and diseases. Use a 500-fold dilution of litchi pest enemy, buprofezin, thiophanate-methyl, and carbendazim for the first spray, then once every 10 days, for 3 consecutive times. When spraying, spray evenly on the underside and upper side of the leaves, and apply especially heavily to the pseudobulb part.
③ Choose a good placement location. Choose the best position in the orchid site. The orchid pot should receive direct sunlight before 8:30 a.m. (in summer), be moved to a shade shed after 9 a.m. to receive "dappled sunlight," and be placed in a cool place after 12 p.m. At this time, it should be ventilated front, back, left, right, above, and below, and water should be released on the ground to flow back and increase humidity; when a fresh breeze comes gently and a cool breeze blows, it is very beneficial to orchid growth.
The above is the knowledge I have learned today about the care and management of Cymbidium ensifolium. I hope flower lovers will find this article helpful after reading it. If you want to know more knowledge about orchid family plants, please continue to follow our Succulent Garden, and we will provide you with more related content as soon as possible!
How to prevent and control pests and diseases in Cymbidium ensifolium?
The following is the relevant knowledge summarized by the editor about preventing and controlling pests and diseases in Cymbidium ensifolium. I hope it can provide help to orchid enthusiasts.
In the bright spring days of March, with bright spring light and flowers competing in beauty, the orchid nursery is full of vitality: the flower scape of Cymbidium ensifolium has already grown more than 20 cm, and the flowers are in bud ready to bloom. However, good times do not come, and good flowers are hard to open; the flower buds gradually shrivel. Only after cutting them open did we know they were already infested by pests, with stem borers wrapped inside. For this, the following treatment methods were adopted.
1. Turn the orchid pot upside down and rinse the orchid roots with tap water. The inner walls of the leaf sheaths attached around the pseudobulb should especially be washed thoroughly; scrape off the dirt, and after drying, soak for 30 minutes in a 300-fold dilution of thiophanate-methyl and carbendazim (the solution should submerge above the pseudobulb), then dry in the shade and repot.
2. Before repotting the diseased Cymbidium ensifolium plant, the planting material and orchid pot must be sterilized at high temperature. Cut off infected leaves, dead tips, and diseased roots. After potting the orchid plant, spray chemicals to eliminate pests and diseases. Use a 500-fold dilution of litchi pest enemy, buprofezin, thiophanate-methyl, and carbendazim for the first spray, then once every 10 days, for 3 consecutive times. When spraying, spray evenly on the underside and upper side of the leaves, and apply especially heavily to the pseudobulb part.
3. Choose a good placement location. Choose the best position in the orchid site. The orchid pot should receive direct sunlight before 8:30 a.m. (in summer), be moved to a shade shed after 9 a.m. to receive "dappled sunlight," and be placed in a cool place after 12 p.m. At this time, it should be ventilated front, back, left, right, above, and below, and water should be released on the ground to flow back and increase humidity; when a fresh breeze comes gently and a cool breeze blows, it is very beneficial to orchid growth.
Southern blight of Cymbidium ensifolium
Mostly occurs during the plum rain season. Attention should be paid to ventilation and light transmission, and good pot soil drainage for prevention. After the disease occurs, the fungus-bearing pot soil can be removed, and pentachloronitrobenzene powder or lime can be sprinkled on.
Anthracnose of Cymbidium ensifolium
Occurs year-round, and is even more rampant in hot and rainy seasons. In addition to improving environmental conditions, during the disease period, spray first with a 800-**** fold dilution of 50% thiophanate-methyl wettable powder, once every 7-10 days, then supplement with 1% equal-amount Bordeaux mixture, once every half month.
Scale insects on Cymbidium ensifolium
Under conditions of high temperature, high humidity, and poor air circulation, they reproduce fastest. Use conventional methods for prevention and control.
Root rot of Cymbidium ensifolium
Nematodes parasitize orchid roots, causing root rot, poor growth of aboveground leaves, leaf color fading and yellowing, and even plant wilting. Nematode damage causes large numbers of wounds and also causes infection by other soil-borne pathogens, leading to plant disease and accelerated plant death. The cultivation substrate should be disinfected, and 100°C steam sterilization can be used to kill eggs. For severe cases, repot immediately, soak the diseased plant in the medicinal solution for 20-30 minutes, remove and dry, and replant with new substrate.
The above is the relevant knowledge for preventing and controlling pests and diseases in Cymbidium ensifolium.