Pear bollworms fight for protracted war

One, harm:

Pear bollworms harm a variety of fruit trees and is also one of the international quarantine objects. Miscellaneous food, there are more than 150 species found. In recent years, the production of kiwifruit, apples, pears, peaches, plums, grapes, cherries and other fruit trees has caused damage. In Zhouzhi, Laoshan and Meixian, the authors investigated that all branches of kiwifruit were damaged by pears, resulting in shriveled trunks, cortical bursts, corkation of the cortex, decline of the ductal tissue, and resistance to normal growth of the branches and leaves. Some whole plants died. On the fruit, there are more blemishes and sessile spots where purple spots are formed, and the quality and grade of the fruit are reduced.

Second, the law of occurrence:

Three generations occurred in Shaanxi one year and wintering on branches with 2nd instar nymphs. When the spring sap flowed in the second year, it began to be harmed. By April, females and males could be seen. In mid-April, the males larvae, and in early May, the eclosion began to mate, and they died immediately after the copulation. The first generation of farrowing to late July to early September, the second generation of female production from September to early November, during the growing season of kiwifruit are damaged. Therefore, it is still necessary to prevent and cure pears in September and October.

Another pear can also reproduce sexually, and unfertilized females can breed fetuses. They can produce 54-108 heads at a time and can produce up to 362 heads. To the second generation of birth to a higher, really more children and more grandchildren. When the young nymphs are hatched for a long time, they climb to the shoots, fruits, and leaves to fix their lives and begin to use the mouthparts to suck in the fruit trees. In the fall, when they climbed into the leaves, they concentrated on the veins. In particular, Qin Mei’s late harvest is heavy.

Third, prevention and control measures

1. Thoroughly clearing the garden: The second instar nymphs that have been overwintering, especially on branches, have been thoroughly controlled, and reduction at the source is the key. Can use 25% of Jin Lux 6000 times liquid +40% thawing 800-1000 times liquid + soft water pass 4000 times, also can kill overwintering spores.

2. Occur in the growing season: When the male eclosion and the female's litter size should be seized control, can choose 40% An Minle 1200-1500 times liquid + soft water 4000 times. Can also choose to use 40% An Minle 1200-1500 times liquid + 70% Nano Xin 1500 times liquid + soft water through 4000 times. When the tree growth is not normal, plus fruit friends amino acid solution to dry, there can be added 6000 times deciduous sequestration trace element liquid.

3. Protection of natural enemies: There are dozens of natural enemies of P. edulis, mainly natural enemies of two species, such as red-spotted ladybugs and ladybugs of the kidney-spotted ladybirds. They can eat up to 700 puppies and nymphs within a month. Therefore, the use of pesticides that cannot be banned by the State when used for prevention and control, and the use of pollution-free pesticides, can reduce the damage to natural enemies of P. grandis. Protecting natural enemies is crucial for the prevention and cure of pears.

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