Early onset of pea leafminer flies should be prevented early

Last year, the number of winter snowfall in several southern provinces was small, the amount of snow was small, and the temperature was slightly higher than usual, which was conducive to the incubation and reproduction of overwintering pests. Recently, when we went to some townships and towns in Hanchuan, Yunmeng, Yingcheng, Xiaochang and other counties and cities in Hubei Province, we saw some of the peas in the field, and in late December, leafminer flies entered the field as a pest, and the area of harm was further expanded in the first half of January, which had a greater impact on the yield and quality of peas.

Pea leafminer flies can occur in multiple generations a year, and in the event of dry and warm weather, the greater the incidence of insect pests, a female worm lays 50 to 100 eggs. Pea leafminers can overwinter in a variety of insect forms, but in severe winter, pupae overwinter more in the affected leaves. When the spring warm flowers bloom, the harm will be more frequent, the loss will be greater, especially the use of insulation cultivation of peas, the young leaves are killed at a high rate, often causing damage to fresh leaves up to 30%, the benefits will be greatly reduced, therefore, should be prevented as soon as possible.

In addition to agricultural control measures, there are many chemical control options, such as 2.5% cypermethrin or 20% cypermethrin 2500 times liquid, or 40.7% Lesben emulsion 800 to 1000 times liquid, or 10% imidacloprid wettable powder 1000 times liquid, or 1.8% efoiding emulsion 2000 times liquid, spraying 90% dimethodium soluble powder 800 to 1000 times liquid at the initial stage of larvae, spraying the foliar surface is completely covered, so that the liquid can penetrate under the epidermis to kill the larvae. Generally, it is sprayed every 8 to 10 days, and 2 to 3 times in a row. Yu Hongzhang