MySheen

The red spider of rhododendron

Published: 2024-11-22 Author: mysheen
Last Updated: 2024/11/22, The female adult is about 0.3 mm long, dark red, nearly oval, the back of the body is raised, 4 pairs of dark red; the male adult is 0.25 mm long, cuneate, flattened bright red. The adults overwintered in the root of the plant, mainly near the main vein of the petiole on the back of the leaf, propagated rapidly in high temperature, less rain and drought weather from June to July, and the damaged leaves were scorched and shedded when the damage was serious. Prevention and control method: manual control, often checked after April, found that individual leaves have red scallops

The female adult is about 0.3 mm long, dark red, nearly oval, the back of the body is raised, 4 pairs of dark red; the male adult is 0.25 mm long, cuneate, flattened bright red. The adults overwintered in the root of the plant, mainly near the main vein of the petiole on the back of the leaf, propagated rapidly in high temperature, less rain and drought weather from June to July, and the damaged leaves were scorched and shedded when the damage was serious.

Prevention and control methods: manual control, regular inspection after April, when it is found that individual leaves have red spiders, the leaves can be burned in time. Conditional natural enemies such as ladybugs, lacewings and thrips can be released artificially for biological control. If more leaves are found to have red spiders, chemical control can be carried out, such as spraying 40% dicofol 800 to 1000 times, which has a strong killing effect on adults, nymphs, larvae and eggs, as long as the uniform effect of spraying is good.

 
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