According to a recent survey conducted by various localities, Bemisia tabaci has a common occurrence in various greenhouse vegetables such as cucumbers, green peppers, eggplants, and tomatoes, especially in coastal areas and Huaibei areas. Among them, the Dongtai green peppers have an insect infestation rate of 95%, and the average lobe adults are 27.53 heads (0-310 heads), which is higher than the 19.86 heads at the end of March, which is significantly higher than the 7.4 heads in the same period of 2008; and the lobules egg 0-6110 heads (grain The average of 1239.68 heads (grains) was 1.5 times the amount of insects at the end of March, which was significantly higher than the 487.11 heads (grain) of the same period in 2008, similar to the 1274 heads (grain) of the same period of 2007; Xiangshui County in March. On the 18th, a total of 720 cucumber nymphs, cockroaches, and adults were observed, 533.3 more than those on March 6, and a total of 1,1333.4 heads of nymphs, cockroaches, and adults were found on the 6th of March. Most of the vegetables in greenhouses along the Yangtze River and southern Jiangsu can be found on tobacco plants.
Grasping the prevention and control work of Bemisia tabaci in the spring shed is the key to controlling the occurrence of Bemisia tabaci in the whole year. At present, it is necessary to vigorously promote the comprehensive control methods of combining agricultural control, physical control, and chemical control to control the damage of tobacco whitefly.
1. Agricultural control: Remove pastoral weeds and reduce suitable hosts. The nymphs and pseudogerminates of B. tabaci were distributed on the back of the old leaves of the plants. The old leaves should be removed and taken out of the shed to be destroyed.
2. Physical control: From April onwards, the use of yellow tobacco to kill yellow worms will be used to kill adults. A 40-50 piece yellow plate with a length of 40 cm and a width of 25 cm per acre is used. The dwarf crop is suspended at 10-20 cm above the crop, and the high stalk crop is suspended at two-thirds of the plant height.
3. Chemical control: Use 48-50 percent chlorpyrifos EC 40-50 mL per mu, or 25% buprofezin WP 30-50 g, or 10% Imidacloprid wettable powder 40-50 g, or 80% Dichlorvos EC 50 mL , Or 25% Pymetrozine Suspension 20g, or 20% Dipenacetamide Soluble Liquid 20ml. Manually spray 40-60 kilograms of water per mu, and motorized fog use 20-30 kilograms per mu. Spray evenly and ensure that the leaves are sprayed to the back. Interval 7-10 days before the use of drugs, pay attention to alternate medication, delay drug resistance. It is strictly prohibited to use highly toxic pesticides.
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