Measures to Prevent and Control Greenhouse Whitefly
"Whiteflies are commonly found in greenhouses. Adults and larvae often absorb plant sap, and the victim's leaves become chlorotic, yellow, wilting and even dead." Professor Yonghua Yong from the College of Horticulture, Northwest A&F University said in an interview with the reporter that adult worms of the whitefly can secrete large amounts of honeydew, contaminate the leaves and fruits of plants, and cause mold parasites, affecting the quality of vegetables and eating health, and causing the loss of vegetables. Product value. Party Yonghua told reporters that the prevention and control of whitefly should be based on agricultural prevention and control, scientific cultivation and management, as well as the rational use of high-efficiency, safe pharmaceuticals, timely chemical control, and physical control and biological control will achieve good prevention and control effect.
Agricultural control
Cultivate insect-free seedlings, remove debris, weeds, and stubbles before seedlings, fumigate with high-strength chemicals, and add nylon gauze to vents to prevent foreign insects. At the same time, pay attention to the rotation of vegetables in the greenhouse.
Biological control
Release the citrifolia wasps. When the greenhouse whitefly adults average 0.5-1 heads per plant, each strain should be placed into 3 bees or 5 heads, every 2-3 weeks, from the second time. The number of bees was increased by the appropriate number of whiteflies at the time to reach 5 heads of bees or 8 heads per plant. Party Yonghua said that in general, the total number of bees per plant is about 15 heads, which can be put three times in a row. In addition, insects of the family Mosquitoes and Grasshoppers can also be placed, and Verticillium virens can also be used for control.
Physical and mechanical control
Yellow trapping and killing, the greenhouse whitefly has a strong tendency toward yellowing. In the greenhouse greenhouses, orange yellow plates of 0.1m in size shall be installed, and No. 10 motor oil shall be coated on the inner Mongolian plastic film, with 32-34 blocks per acre. . The board is placed between the rows and is level with the plant. The engine oil is re-applied once every 7-10 days, and it is better to use it in combination with the citron.
Chemical control
Attention should be paid to the selective use of the characteristics of the greenhouse whitefly insects at the same time to harm the crops, the same kind of agents should be used alternately to slow down the occurrence of drug resistance. At the same time, some prevention and control indicators should be taken into consideration when adopting chemical control, such as the prevention and control of 10 whitefly insects on each leaf of a tomato plant.
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