Recently, a joint investigation by the Plant Protection Station of Beijing Municipality and the plant protection stations of various districts (counties) found that the brown beetles in the summer corn field had been unearthed. The occurrence area and occurrence degree of thoracic leaf brooch in the brown foot was higher than that in the previous year. The rate of summer larvae was about 90%, and the average worm size was 30 heads to 100 heads. Serious land masses occurred. The rate of the affected plants reached 100%, and the number of 100 insects exceeded 1,000. The adults of the brown-leafed brooch are oval or nearly square, 3-5.5 mm long, and the pronotum is hexagonal in shape, with sharp corners protruding in the middle of both sides. Brown-browed thoracic leaves have brown, blue-green and patina colors. The city is mainly brown and yellow, accounting for about 95% of the total insects. Adults of the genus Acanthamomorpha are larvae of the genus Chlamydomonas, and their activity peaks before and after 9.00 o'clock in the morning. Adults feed on the upper middle leaves or heart of corn to form mesh holes. When the amount of insects is high, the leaves can be eaten and the veins remain, resulting in loss of yield. At present, it is a time when the adults of the brown-browed brood broach are in danger. The plant protection departments of each district (county) must closely monitor their population in the field to prevent the insects from damaging the summer maize. Sites that have already been severely affected can be sprayed and primed in the morning after the dew has evaporated or in the evening. Considering its strong activity, the pharmaceutical agents need to select the beta-cypermethrin, deltamethrin and phoxim, which have contact and stomach toxicity.
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