Bemisia tabaci is a polyphagous pest that mainly damages crops such as melons, legumes, eggplants, flowers, etc. It cannot be overwintered in open land in our province, and shelters such as greenhouses (especially nursery beds) are its main sites for wintering. The prevention and control of winter can effectively reduce the population of insect population, which is the key to prevention and control throughout the year. In the spring of this year, Bemisia tabaci appeared mild to moderately mild, and summer and autumn were moderately heavy. After entering the winter, the B. tabaci in vegetable greenhouses with poor early control and control effects was heavily emphasized. The prevention and control of production should be conducted in a timely manner to minimize the occurrence and harm of tobacco whitefly. To control whitefly, comprehensive measures can be taken in response to its habits. The first is to strengthen field management, such as isolating nursery beds, transplanting seedlings in a timely manner, and promptly clearing the sheds to exterminate insects. The second is to carry out physical prevention and control, using yellow traps to kill, remove film cooling and other measures to kill adults. The third is to carry out chemical control, spray on the core area of ​​B. tabaci, from the outside to the inside cocoon, require all crops in the area to be sprayed to the drug, a serious field of B. tabaci, every 5 to 7 days and then control once. Can be used alternately with 20% acetamiprid wettable powder 3000 to 4000 times, or 25% pymetrozine wettable powder 2000 times, or 10% imidacloprid wettable powder 1500 times, or 0.9% avicapsin EC 1200 times liquid, or green wave 1.1% Baibuyan EC 1000 times spray, pay attention to the back of the leaves to be sprayed to improve control. Green Wave 1.1% Baibuyan Cigarette Emulsifiable Oil should avoid light conditions and apply pesticides to sunny days after 4:00 pm or on cloudy days. This drug is a plant-derived pesticide and it is best not to mix it with other pesticides. Large greenhouses with severe occurrence of Bemisia tabaci and no longer harvested can also be treated with dichlorvos smoke and smoke, with a dose of 350 to 400 grams of 10% dichlorvos per acre. Pay attention to strictly controlling the amount of medication and implementing safety intervals to ensure the quality and safety of agricultural products. Xi'an JCF Herb Technology Development Co., Ltd , https://www.jcfherb.com
Protecting tobacco plants in winter