Cotton field whitefly control should be tightened
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1. Hazardous characteristics Bemisia tabaci adult nymphs cluster on the back of the leaf sucking sap, secreting honeydew induced mildew disease, the victim's leaf chlorosis, yellowing, faded spots appear on the front, and when the density of the larvae is high, there are yellow spots, resulting in plants The growth is debilitating, the growth is slow, the bolling is not smooth, the weight of the single boll, the length of the fibre and the pulling force are reduced, and the yield and quality are reduced. When the density of insect population is large, the cotton plant can cause wilting and death, and the budding bell can fall off. It has been observed that B. tabaci is mainly distributed on the upper leaves of cotton and there are fewer old leaves on the lower part. Bemisia tabaci generations occur one generation in a year and overlap in generations. In northern regions, adults are observed in mid-June in general, and serious damage occurs in August-September, with a significant decrease in late October.
Second, control methods Betula alfalfa early stage, available 10% imidacloprid wettable powder 1000 times, or 3% acetamiprid EC 1500 times, or 10% nitenpyrazole aqueous 2000 times, or 1.8% Avi Bactin Suspension 1000 times, or 25% thiamethoxam (Aketai) water dispersible granules 3000 times, 25% buprofezin (Pentazoyl) WP 2000 times evenly spray control. The application of pesticides should be better after 3:00 pm. 7-10 days prevention and control, continuous prevention and treatment 2-3 times. And note that the above agents are used interchangeably to prevent drug resistance.