First, the current insect situation and prediction:
1. Cotton leaf mites: According to recent surveys, at present, the weedy leaf mites in the field and the forest belt have begun to feed and lay eggs, of which the mite plant rate of the field spin flower is 4.44%, the amount of 100 mites is 5.55 heads, and the number of eggs in 100 plants is 26.6 grains. Dandelion has a mite plant rate of 6.25%, the amount of 100 mites is 6.25 heads, the rate of artemisia mites is 5%, the amount of 100 mites is 7.5, and the rate of 10% of mites is 15 heads of 100 mites.
2. Cotton bollworm: According to the overwintering survey, the wintering pupae in the cotton field are 0.013 heads/m2, and the alfalfa field is 0.1 head/m2, the average wintering mortality rate is 8-10%, and the initial feathering period of overwintering adult insects is expected to be early May.
3, cotton aphid: through the spring two aphid extermination activities, the source of overwintering aphids has been effectively controlled, indoor flower cotton aphid prevention effect of 95%, according to the investigation of the golden tree, the guard thatch tree, in mid-March the investigation of eggs have hatched. It is expected that the wintering host cotton aphids will begin to migrate in early May.
4. Corn borer: According to the survey of corn stalk section on March 23, the worm rod rate was 33.75%, the 100 stalk larvae were 56.25 heads, the larval overwintering mortality rate was 35.6%, and the overwintering mortality rate was high, and it is expected to be moderate to moderate.
5, cotton thrips: On April 19, the weed artemisia began to appear.
6. Forest pests
(1) Spring inchworm: feathering begins on March 11, and feathering peaks and spawning begins on March 13-24. According to the investigation on April 19, there were 3-6 larvae of 1-3 in the 20 cm elm branches and 0-2 heads of poplar trees in the 20 cm branches of spring inchworm. The best time for larval control is around 20-25 April.
(2) Elm money borer: According to the survey on April 19, there are 0-3 4-year-old larvae of 20 cm branches.
(3) Yang Mengni Nocturnal Moth: First seen under the lights on March 9, it entered the peak period of feathering on March 23. According to a survey on April 19, 50 cm poplar tree branches 1-3 instar larvae 0-1 head.
7, natural enemies: According to the recent survey of weeds, grasshopper adults 0.97 heads / 100 plants, grass worm eggs 3.9 grains / 100 plants.
Second, plant protection work recommendations
1. Earnestly do a good job in blocking the ground edge work, in order to suppress the base number of leaf mites, thrips and other pests, and delay the time for leaf mites to enter the ground. The medication is 5% avermectin emulsion 2000 times liquid, or 10% avermectin suspension 3000 times liquid, which is blocked by a spray gun.
2. At present, some cotton seedlings in the cotton field have been manifested, and cotton thrips can be controlled by using 98% meperimone, combined with the first chemical adjustment, using 20% acetamidine 10 g / mu or 40% acetamidine 5 g / mu for control.
3. According to the occurrence of forest pests, the current is the best time for prevention and control, and the relevant departments should pay close attention to prevention and control.
4. Do a good job of crushing or destroying corn straw before the end of April, reduce the occurrence base of corn borer, and reduce its harm.
5. Scientific and safe use of pesticides, standardize pesticide management and use behavior, and timely clean up pesticide packaging. Pesticide users should properly collect pesticide packaging and other wastes, strictly prohibit arbitrary discarding, pesticide operators should recycle pesticide waste, to prevent pesticide pollution of the environment and pesticide poisoning accidents.
Author: Liu Zhaohai, Source: Eighth Division 148 Regiment Plant Protection Station, Graphic Editor: Tianshan Plant Protection, please indicate the source when reprinting!