What are whitefly control methods?

What are the hazards of whitefly? What are the control methods of whitefly? We also asked experienced netizens to introduce whitefly, also known as small white moth, which is a worldwide pest that occurs all over China. White whitefly is harmful to cucumbers, beans, eggplant, tomatoes, peppers, beans, lettuce, cabbage, celery, scallions, flowers, fruit trees, medicinal herbs, forages, tobacco and other 112 families and 653 species of plants. Therefore, the farming network has sorted out the harm and control methods of whitefly, which are listed in detail below for netizens' reference. The harm of whitefly: the adult size of whitefly is about 0.9Fi 1.4 mm, yellowish white or white, both male and female have wings, the whole body is covered with white wax powder, the individual female is larger than the male, and its spawning organ is needle-shaped. White whitefly mainly uses adults and nymphs to feed on plant sap, which makes the leaves of the damaged crops fade, turn yellow, wilt, and even wither the whole plant. Moreover, whitefly has strong fecundity, fast reproduction, large population, clustering and harmful, and secretes a large amount of honey, which seriously pollutes leaves and fruits, which often causes the occurrence of coal fouling disease and makes vegetables lose their commercial value. Methods for the control of whitefly: method 1. Trapping with armyworm board: using a yellow board with a size of 1 to 0.2 meters, coated with No. 10 engine oil, hanging in a shed, ground or crop row with whitefly; when the armyworm board is covered with whitefly, brush it off, re-oil it, and then trap it. Method 2. Aphid wasps were artificially released and 3 adults per plant were released every 5 days for a total of 3 times. Aphid wasps can establish population in the greenhouse and effectively control the damage of whitefly. APHIS gossypii mainly laid eggs in the larvae and pupae of whitefly, which blackened and died after 8-9 days. Method 3. Greenhouse fumigation: sprinkle dichlorvos with sawdust, reeds and rice straw, and add a piece of red-hot coal ball to smoke. About 80% dichlorvos EC 0.4-0.5 kg per mu of greenhouse It can also be used in greenhouse with 150ml of 80% dichlorvos EC, 14kg of water and 40kg of sawdust per mu, mix well and sprinkle between the lines, close the doors and windows, fumigate for 1.5 hours, control the temperature at about 30 ℃, and the control effect is very good. Method 4. Chemical control: eggs, nymphs and adults can be controlled by 2.5% prolactin wettable powder 2500-3000 times. In the peak period of the occurrence of young nymphs, spray 1000 times of 25% buprofezin wettable powder or 40% omethoate EC 1000 times, 8% insecticidal wettable powder 1500 times, 20% methamphetamine EC 1000 times, 44% Sukai EC 1500 times, 20% imidacloprid (Kangfudo) concentrated solvent 3000-4000 times. The above effective agents should be used in rotation to slow down the occurrence of drug resistance, and the selected agents should be sprayed on the back of the leaves, spraying once every 5-7 days, even 3-4 times, and the control effect is more than 98%. How to make armyworm? what's the harm of root-knot nematode?