Whitefly in a greenhouse is difficult to control

In recent days, many vegetable farmers have reported that the whitefly occurrence in the shed is heavy, and a number of prevention and control measures such as smoking and spraying are used, with little success. After careful analysis, the author believes that the main reasons are as follows: First, the farmers do not really understand the whitefly. Whitefly is a member of the order Homoptera, Acipenseridae, adults and nymphs, which sucks plant sap and forms green spots. Plants wilting and even die. Strong reproductive power, large population, and the secretion of honey after the damage, affecting the food value of vegetables and commodity value. The wing surface is covered with white wax powder and it is not easy to stick liquid medicine. When the temperature is low in the early morning, the ability to fly is weak. After the sun is out and the air temperature is high, it is very strong. The second is that the medication time is incorrect. Most growers use drugs when the sun is out and there is no dew on the surface of the leaves. The result is not ideal. Third, the drug formula is not scientific. Many farmers believe that the higher the price of pesticides, the better the effect, or the use of good written results is ideal, in fact, as long as the formula science, cheap drugs can also achieve good control effect.

In view of the occurrence of whitefly, I believe that the following measures can be taken to prevent and control: First, the use of insect nets vent outlet, to prevent adult insects into the greenhouse hazard. Using the characteristics of yellowish whitefly adults, yellow sticky board was hung in the shed. The second is to adjust the medication time and change to the early morning medication with the ability to fly whitefly. The third is to change the drug formulation, can be used to double the 5000 times the liquid plus 600 times the net plus liquid, or to kill 5000 times the liquid plus 1000 times the general spray stem and leaf spray, spray every 5 to 7 days, alternating medication, In order to avoid drug resistance. In order to reduce the occurrence of coal contamination caused by honeydew secreted by whiteflies, thiophanate-methyl 800-fold solution or carbendazim 600-fold solution can be added in the control of whitefly to achieve the purpose of spraying more.

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