Cotton field to prevent cotton mealybugs

The whitefly is also known as whitefly, commonly known as the "white moth". It belongs to the order Homoptera, Fructus genus, and Fructus. It is widely distributed around the world. In recent years, with the large-scale cultivation of insect-resistant cotton, the amount of pesticides in cotton fields has been greatly reduced, and cotton mealworms have become increasingly serious. This has become an important pest in the mid-to-late period of cotton growth, and damage to cotton fields is generally reduced by about 10%. Severe up to 10% to 20%.

First, the occurrence of regular cotton whitefly can occur 11 to 15 generations a year, with eggs, nymphs, adults overwintering in the protected area, the following year in mid-May to early June in the cotton field infestation, in late August to early September to reach The peak period of damage. With adult or nymphs gathered on the back of cotton leaves, sucking cotton sap, when the density of insects is large, the cotton leaves appear with yellow patches on the front, causing a large number of bud bells to fall off; in the meantime, adults or nymphs also secrete honey dew 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, and its host range is very wide. 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 liquid, 1.8% avermectin 1000-1500 times liquid, 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 (parasitoids, 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.