Wheat red spider points wheat round spider and wheat long leg spider. Wheat long-legged spiders occur 3 to 4 generations a year, adults and eggs overwinter, and in March of the following year, the active wintering eggs are also hatched. From April to May, they enter the breeding and endanger period. During the middle and late May of the year, the adults lay eggs in summer. In mid-October and mid-October, the hatching eggs infested the wheat seedlings in succession. It took 24 to 26 days to complete a generation. The optimum temperature was 15 to 20°C, and the optimum humidity was 50% or less. As a result, spring wheat fields were severely drought-prone. Recently, Henan and other places have different degrees of occurrence of wheat spider mites. Therefore, growers must be cautious about the treatment of wheat spider mites.
Control methods: First, agricultural control. The use of crop rotation, reasonable irrigation, timely field weeding, wheat harvest, shallow cultivation, and other methods to reduce the source of insects. The second is chemical control. Can choose 20% bismuth net wettable powder 3000 to 4000 times liquid or 2% avermectin 6000 times liquid or 15% cicada 3000 times liquid spray control or 1.8% cicadacock 5000 to 6000 times liquid, control effect Up to 90% or more.
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