The Occurrence Regularity of Red Spider on Hawthorn

May 21, 2021

Hawthorn red spiders 5 to 10 generations a year. The fertilized female adults in the bark gap and in the gaps in the soil at the base of the trunk overwinter. In the spring of next year, when the buds inflate, they begin tree activities. The buds are green and then transferred to the buds. Hazard, after leaf spreading, they were sucked on the leaves. After more than 10 days, they spawned on the leaves. After the nymphs hatched, the clustered leaves sucked and harmed. From July to August, the breeding was the fastest, with the largest number and the most serious damage. July At the end of the month, red-coloured overwintering females began to appear. Usually, after September, they latently overwintered. Their adults and nymphs were inactive. In early spring, they were concentrated on the inner litchi of the tree and formed a clustered back and endangered. .

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