Whitefly is the main pest in vegetable production in Dayi County. It is widely distributed and harmful, which seriously restricts the yield and quality of vegetable. White meal has occurred in vegetable fields. The rate of occurrence of field worms is over 50% and the highest is 90%. Because whitefly mites breed quickly, resistance is strong, and generations overlap. Therefore, once the white meal is found, the drug should be controlled. The following are the control methods for whitefly:
First, the characteristics of occurrence
More than 10 generations can occur in a year, and the overlapping views of the generations are obvious. The nymphs are often clustered on the backs of young leaves of vegetables to suck and juice; causing leaves to chlorotic, yellow, plant growth weak, and even dead. Adults of whitefly and nymphs suck the sap of plants, which not only seriously affects fertility, but also discharges a lot of honeydew, causing coal pollution, polluting fruits and leaves, causing production cuts and affecting quality.
Second, prevention measures
1. Agricultural control and cultivation of insect-free seedlings, seedbeds are separated from production greenhouses. Since whitefly eats cucumber, tomato, green pepper, eggplant and other vegetables, the above vegetables in the greenhouse should not be mixed with the above.
2, the yellow board traps the use of adult worms on the strong trend of yellow. The height of the yellow plate should be slightly higher than the 10-15 cm of the plant, and it is economical to suspend 30 pieces of acre.
3, the chemical control can be selected with 10% Dagongchen (Imidacloprid) 1500-2000 times spray, evenly spray the upper and lower leaves of the plant front and back, the effective period of up to 15 days; 2.5% Kung Fu 3000 times liquid spray control, good quick-acting It should be sprayed once again 7 days after application; or 10% of eucalyptus emulsifiable concentrate 1000 times, or 20% of sterilized emulsifiable concentrate 2000 times.
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