First, the law of occurrence
The whitefly can occur 11-15 generations a year, with eggs, nymphs, and adults overwintering in the protected areas. In mid-May to early June, damage occurs in the cotton fields. From mid-August to late September, the peak period of damage is reached. With adult or nymphs gathered on the back of cotton leaves, sucking cotton sap, when the density of wormholes is large, yellow patches appear on the front of cotton leaves, causing a large number of beebells to fall off; in the meantime, adults or nymphs also secrete honeydew to make cotton. Leaves and bells are blackened and the fiber quality is reduced. The suitable temperature for the development of cotton mealybugs is between 24°C and 28°C. Its host range is very wide and it is an important pest on cotton.
Second, control methods
1. Temptation. Cotton mealybugs have a strong tendency to yellow and can be trapped using yellow plates. The specific approach is to use a yellow material made of appropriate size of the yellow plate, inserted in the field side, slightly higher than the cotton, apply oil on the board, usually 7 to 10 days once, can greatly reduce the cotton field population density.
2. Drugs to kill. Can be mastered in the upper, middle and lower leaves of cotton, the average single leaf nymph reaches 16-20, 10% imidacloprid 1500-2000 times, 1.8% avermectin 1000-1500 times, 25% oxacillin 1000 ~1500 times liquid or 25% cotton insects 1500 times liquid spray.
In addition, there are many species of natural enemies in the whiteflies, and there are currently hundreds of predatory natural enemies (ladybugs, predatory mites, grasshoppers, predators, etc.) and hundreds of parasitic natural enemies In the rest of the species, we must pay attention to the protection and utilization; remove the weeds inside and outside the cotton field in time, and not plant cotton pods, zucchini, wax gourd, squash, and other vegetables in the vicinity of the cotton fields; pruning in time, remove the invalid leaves at the bottom of the cotton, and waste the leaves that are covered with pests. Bringing out of the field or burning deep can reduce the number of insects in the field.
Edible Starch Mixer,Starch Mixer,Coupling Starch Mixer,Yam Starch Mixer
Shuangfeng County Dingyuan Machinery Manufacturing Co. Ltd.. , https://www.separators.pl