Detailed Explanation of the Occurrence and Control Techniques of Common Orchid Pests and Diseases

The occurrence and control techniques for common orchid pests and diseases are a very troublesome issue. Today I will share with you what the occurrence and control techniques for common orchid pests and diseases are.

What are the occurrence and control techniques for common orchid pests and diseases:

During the cultivation of orchids, they are often harmed by pests and diseases, which not only reduces their ornamental value but in severe cases can even lead to death.

1. Anthracnose. This disease is a common orchid disease, mainly harming the leaves. In the later stage, small black spots appear on the lesions, eventually causing the diseased leaves to wither and turn yellow. This disease occurs mostly in May-June, during the plum rain season, or in years with heavy autumn rain or many typhoons in September-October. Control methods: ① Promptly prune out diseased leaves and burn the diseased plant debris. ② Improve the watering method, that is, slowly pour water in from the edge of the flower pot. ③ After new leaves emerge in winter, spray Bordeaux mixture (1:1:140) 1-2 times. In the early stage of the disease, spray 50% carbendazim 500-600 times dilution. At the same time, strengthen ventilation and light transmission, and avoid spraying water on the leaf surface.

2. Leaf blight. It mainly attacks orchid leaves. In the early stage, it appears as small reddish-brown spots, which then rapidly expand into oval or round dark brown lesions. When there are many lesions on the leaves, the leaf tissue between the lesions loses its green color and turns yellow and dies. Control methods: ① Collect diseased leaves and diseased plant debris and burn them. ② Pay attention to ventilation and light transmission, prevent excessive watering, and avoid directly spraying or watering the plant. ③ Spray with 50% thiophanate 600-800 times dilution. Spray once about every 10 days, and 3-4 consecutive sprays are sufficient.

3. Southern blight. One of the main diseases of Cymbidium, caused by [pathogen]. It is prone to occur in hot and rainy seasons, often appearing in May and June, with July and August being the peak period of incidence. Control methods: ① Promptly remove diseased leaves, diseased plants, and diseased planting holes, and lime can be spread and mixed in; before planting, drench the potting soil with 30% Tumiao Xiao water agent 1000 times dilution. ② In the early stage of the disease, 1:500 chlorothalonil can be used to spray the leaf surface and irrigate the roots.

4. Scale insects. Shield scales and mealybugs are common. The occurrence period is from April to October, and they occasionally occur in winter as well. Their reproductive capacity is extremely strong, and they can produce multiple generations in one year with overlapping generations. May to October is severe. Control methods: ① When only a small number occur, they can be brushed off with a soft brush and then rinsed clean with water. ② When there are many, spray 40% Supracide emulsifiable concentrate 1000 times dilution during the peak hatching period. When spraying, both the front and back of the leaves must be sprayed. Spray continuously 3-4 times, with an interval of 5-7 days each time, and they will basically be eliminated.

5. Red spider mites. Their reproductive capacity is strong and the damage is very serious. They are prone to occur during the high-temperature period from June to August.

Control methods: ① If the number is small, they can be brushed off with a wool brush or a small brush. ② If there are many, use 40% dicofol 1000 times dilution to kill them. ③ A folk method is to light one mosquito coil and place it in the pot of the diseased plant, then cover the pot together with a plastic bag. After fumigating for 1 hour, both eggs and adults are killed, and the plant is not affected.