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Occurrence and Control Techniques of Common Diseases and Pests of Orchids
In the course of cultivation, orchids are often harmed by pests and diseases, which not only reduce the ornamental value, but also cause serious deaths. 1, anthrax. This disease is the most common disease of orchids. It mainly damages the leaves. Black dots are formed on the late stage lesions, and finally the diseased leaves are brown. The disease usually occurs in May-June, during the rainy season or in the September-October period, there are many typhoons or typhoons. years. Control methods: 1 Cut off the disease in a timely manner and burn the dismembered body. 2 Improve the way water is poured, ie slowly inject water from the edge of the pot. 3 After the new leaves sprout in winter, spray Bordeaux mixture (1:1:140) 1-2 times, spray 50% carbendazim 500-600 times in the early stage of the disease, and strengthen ventilation and light transmission to avoid spraying on leaves. 2, leaf blight. The leaves that invaded the orchid mainly attacked the small spots of reddish-brown color at the beginning, and quickly expanded into oval or round black-brown lesions. There were many lesions on the leaves, and the leaf tissue between the lesions lost chlorosis and died yellow. Control methods: 1 Remove the diseased leaves and the diseased bodies are burned. 2 pay attention to ventilation and light, to prevent over-watering, bogey directly sprayed plants. 3 can use 50% thiophanate 600-800 times spray. Once every 10 days or so, spray 3 to 4 times. 3, white peony disease. One of the major diseases of orchids is caused by fungi. It is prone to occur in high-temperature and rainy seasons. It often appears in May and June, and it is the epidemic period in July and August. Control methods: 1 timely removal of diseased leaves, diseased plants, disease points, can be disinfected lime disinfectant; before planting fixed strains with 30% earthworm water-removing agent 1000 times liquid wet soil. 2 At the beginning of the disease, 1:500 times of chlorothalonil spray can be used to spray the leaves and roots. 4, scale insects. Shield and whitefly are the most common. April-October is the occurrence period, and winter occurs occasionally. Its fertility is extremely strong. It can occur for multiple generations and overlap in generations in one year, and it is the most serious in May to October. Control methods: 1 When a small amount occurs, it can be brushed off with a soft brush and rinsed with water. When 2 is more, it can spray 40% quick-acting emulsion 1000 times in the hatching period. When spraying, the front and back of the leaf should be sprayed and sprayed continuously for 3 to 4 times. Every time they are separated by 5-7 days, they are almost extinct. 5. Red spider has strong reproductive ability and serious damage. It is prone to occur during the period of high temperature from June to August. Control methods: 1 A small amount, brush or small brush can be used to remove. More than 20% kill with 40% dicofol 1000 times. 3 The soil method can ignite a mosquito coil, place it in the pot of the diseased plant, and cover it with a plastic bag. After 1 hour of smoking, no matter whether the egg or the adult is killed, it does not affect the plant.
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