2. It is an effective way to eliminate overwintering pests by ploughing and cultivating garden fields. Through ploughing, the deep soil pests and pathogens can be turned to the surface and frozen to death, dry or eaten by natural enemies, so that buried insects can not be feathered and suffocated, thereby reducing the overwintering base.
3, scraping bark fruit trees, rough skin, cracks and trunk cracks, often hidden a large number of winter pathogens and pests. Practice has proved that winter scraping bark has a good control effect on a variety of pests and diseases. The fact that the farmer “has to eat pears and scrape bark†is the reason.
4, trunk painted white winter trunk white can eliminate a large number of pathogens and pests on the trunk overwintering. The proportion of whitening agent is generally: 10 parts of quicklime, 2 parts of lime sulfur, 1-2 parts of salt, 2 parts of clay and 35-40 parts of water. The time of whitening is best twice. The first time after defoliating the fruit trees until the soil is frozen, the second time in the early spring.
5, trapping and killing pests use insect pests on the selectivity of wintering places, in the big branches of fruit trees tied grass or broken sack sheet, trapped pests pupate the winter, and then focus on killing. This method has a 47%-78% trapping effect on apple fruitworms and fruitworms. It also has a good trapping effect on spider mites, red spider mites, date spider mites, leaf spines, and leaf roller moths.
6. Chemical control of deciduous fruit trees During dormancy, 1-2 sprays of diesel emulsion with oil content of 4%-5% and lime-sulfur mixture of 5 Baume degrees are sprayed on 1-2 times, and various scale insects, red spiders, and apple rot that are harmful to fruit trees are rotted. Diseases, pear tree scab, grape black spot disease, etc., all have significant control effects.
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