Method for preventing pear gall midges

Abstract

The invention discloses a method for preventing pear gall midges. According to the occurrence law of the pear gall midges, a pear line is ploughed deep, the living environment of worm cocoons of the pear gall midges is broken, pesticides are spread on the ground, 500-time chlorpyrifos is spread among lines of the pears per mu, the adult gall midge unearthing is controlled, and the crown is sprayed with the pesticides. The pesticide is sprayed in the larva harm period, namely when a large number of fresh tips and tender leaves are longitudinally rolled into a cylinder shape, the leaves or buds with the gall midges are removed in time, the leaves or the buds with the gall midges are centrally processed or burned, and secondary harm is reduced. The method is mainly used for preventing the pear gall midges, the effect is achieved quickly, a large number of pear gall midge sources are killed, the yield of the pears is increased, and the loss caused by plant and pest diseases is reduced.

Description

technical field [0001] The invention relates to the field of disease and insect control of fruit trees, in particular to a method for preventing and controlling pear gall midges. Background technique [0002] Pear gall midges are difficult to prevent and treat. The main reason is that the adults are small, only about 1.6 mm in size, and it is difficult to find them when they occur and lay eggs, resulting in missed opportunities for prevention and treatment. The larvae (maggots) are milky white in the early stage and orange in the later stage, tightly wrapped in In the edge of pear leaves, it is not easy to contact with pesticides when applying pesticides, which leads to more and more serious damage. Pear gall midges fall into the soil as mature larvae and cocoon overwintering. Field observations have overlapping generations, and the severity of occurrence is closely related to soil moisture. There was rainfall in the early stage, and then the pear trees sprouted new shoots, ...

AI Technical Summary

Problems solved by technology

[0002] Pear gall midges are difficult to prevent and treat. The main reason is that the adults are small, only about 1.6 mm in size, and it is difficult to find them when they occur and lay eggs, resulting in missed opportunities for prevention and treatment. The larvae (maggots) are milky white in the early stage and orange in the later stage, tightly wrapped in In the edge of pear leaves, it is not easy to contact with pesticides when applying pesticides, which leads to more and more serious damage. Pear gall midges fall into the soil as mature larvae and cocoon overwintering. Field observations have overlapping generations, and the severity of occurrence is closely related to soil moisture. There was rainfall in the early stage, and then the pear trees sprouted new shoots, and the pear gall midges occurred in large numbers, which had a very serious impact on the pear trees, especially in the nursery, especially when there was no early spring clearing or pear orchards. The young leaves of pear trees are damaged by larvae. In the initial stage, the damage is very similar to that of pear aphids, and it is difficult to distinguish. The leaves are damaged and roll inwards in the shape of green onions. They cannot be unfolded from then on. The damaged leaves gradually change from bright yellow-green to purple-red, and the damaged parts turn inwards. Longitudinally rolled and uneven, the leaves are hard and brittle, and finally turn black and die and fall off. In severe cases, the new shoots on the upper part of the crown will lose their leaves and become bald. After the spring and summer shoots of adult fruit trees are killed, the young leaves will turn black and fall off, affecting the growth of the year. Branch growth and tree photosynthesis, the fruit of the damaged pear tree becomes smaller, the sugar content decreases, the damaged branches cannot form flower buds in the second year, and some of them form bare branches