Causes and Prevention of Severe Damage to Pears

Last year, the occurrence of pear hibiscus occurred in northern Shaanxi, especially in June, July and August. Some of the pears' leaves, fruits, and tender stems produce severe black pollutants. Affects the normal photosynthesis of leaves and weakens the tree vigor. The fruit loses its value of goods and losses are serious.

I. Cause of damage

1. Large population of insect population. In 1998, the pear orchard that had been severely affected by pear hibiscus had not been well sprayed and prevented before sprouting in early spring last year.

2. Natural factors. Last year, rainfall in northern Shaanxi was relatively high before May, which was not conducive to the breeding of pear wood lice. Liyuan had a lighter love, so people were lax in prevention and control. However, after May, the rainfall is relatively low, and the high temperature and drought are conducive to the rapid propagation of P. crassifolia. When the farmers are alerted, the base number of insect population is quite large and the control efficiency is not good.

3. Human factors: Insufficient management experience of fruit growers in Shaanwei Pear Fruit Area, found that insects use pesticides indiscriminately, resulting in poor efficiency and mistaken prevention and treatment. Instead, they caused resistance to pear hibiscus, killing natural enemies (such as ladybugs and grasses). Bells, etc.), pests are getting worse.

Second, prevention and control strategy

Considering the pest origin, occurrence characteristics and comprehensive factors of environmental systems, the idea of ​​“prevention-based, comprehensive prevention and control” was established. When you take control in the key period, you will surely receive a multiplier effect.

1. Scrape the bark in early spring (especially the old rough skin of the trunk) and together with the litter and weeds that have been wiped out, burn them centrally or bury them deeply to eliminate overwintering adults and reduce the population density.

2. Remove egg leaves at any time during the growing season. It is produced at the leaf surface veins or leaf margins, leaves the back, is oval, pale yellow at first, followed by yellow, one end obtuse, below a spike-like protrusions to fix it; the other end of the tapering, extended into a long Silk, easier to identify.

3. In the overwintering period of adult mats, approximately 70% to 80% of flowers fall, spraying begins. If the weather is dry during the growing season, combined with other pest control, the use of systemic, adhesive insecticides. For example, it is possible to use 0.9% Qiqisu 4000-6000 times, green time 4000 times plus 1% light diesel oil or 10% imidacloprid 800-1000 times, or 0.5% decanter 2000 times.

If the control is relatively late and has caused a major accident, spray 0.5% liquid detergent first, rinse the mucous of each part of the tree and then use the medicine.

4. The serious orchard that took place last year must pay attention to the restoration and restoration of tree vigor. During the growing season, it can be dried or sprayed with CA2000 fruit ammonia (amino acid).

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