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Living habits 4-5 generations in the Yangtze River Valley, to winter in the soil. Various generations of adult emergence period: in mid-June, mid-July, mid-August, mid-September, and mid-November, there may be a small number of fifth-generation adults. The 2-4th generation egg period is 5-8 days, the larval period is 18-20 days, and the flood period is 8-10 days. It takes 32-42 days to complete the l generation. Adults grow into nighttime and have strong phototaxis, spawning 2-3 days after emergence, and prolific on the ground, earth seams and grass stalks. When they occur, they can be produced on branches and leaves, with dozens of grains to more than one hundred grains. The heap can produce 1000-2000 grains per female and only over 200 grains in the wintering generation. The newly hatched larvae can be spread and spread by the wind. In October-November, the last larvae were ploughed into the earth for winter. This worm is an intermittent fulminant pest, and it usually occurs in crops such as cotton and beans.
Prevention methods (1) Use black light or high-pressure mercury lamp to seduce adult. (2) Do a good job of forecasting and strengthening the control of larvae in cotton fields. From the end of hatching of larvae to the height of the third instar, when 100 larvae reach 100 heads, spray commonly used organic phosphorus concentrations such as dichlorvos and malathion, or 50% octyl cyanide 1500-2000 times liquid, 20% fenprofosin EC 1500 times, 40% Chrysanthemum EC 2000 times, etc., can also be used 10 billion live spores / Bacillus thuringiensis WP 500-10oo times.
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The living habits and prevention methods of the bridge insects in cotton
The host of cotton bridges is mainly cotton, citrus, pear and so on. Its damage characteristics are larvae sprouted leaves and tender stems, severe food into a light bar. The following Xiaobian will introduce its living habits and prevention methods.
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