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1. The overwintering law of pests. Pests have different living habits and cold-resistance capabilities, and overwintering conditions and sites are also different. For example, cotton aphids are spawned in the buds and branches of plants such as hibiscus and pomegranate, or in the roots of various weeds such as Prunella vulgaris and violet flowers. Overwintering; Swarmoceros cerana, Swarth plucked burrowing cricket, Ogata, Taiwanese rice blast, and II larvae overwinter in corn, sugar cane, peony, etc. crop culms and grass weeds; locusts with eggs on river banks, field ridges Wintering in the earth seams such as barren hills; wheat bran overwintering in the rhizosphere earth seams of wheat; maturing larvae of corn borers mainly in winter in corn stalks; cotton bollworms pupas in winter in soils of cotton fields; Grass roots, clods, overwintering in litters; larvae of cotton larvae are mostly overwintering in cotton leaves or cotton bolls; Pear and gold-grained moths of fruit trees, larvae, weevils, grape dusts , Two-star leafhoppers, Citrus ginkgo, etc., generally latent in deciduous or stagnant fruits overwintering. Some pests overwinter with adults, such as citrus wall-cockroaches, spider mites, and many adults or eggs in the leeward sunny branches cracks, axillary buds overwintering, etc., and endanger the agricultural pests such as tigers, earthworms, etc., their old Larvae are usually wintered in the depth of 10-15 cm.
2. Winter and spring prevention measures.
1 Clear the fallen leaves of farmland orchards. Timely disposal of straw scattered in the rice fields, eradication of stubble white stubble, picking up corn stalks, sorghum, clearing cotton stubble stubble stubble insects in the cotton field. The orchard's fallen leaves and the cut pests and branches are burned together or buried deep to reduce the population density and damage to the source of insects in the following year.
2 deep plowing land, winter plowing and freezing. After the winter plowing in paddy fields, some rice bran is exposed on the surface. Due to the winter drought, cold wave and ice and snow weather, some pests will lose their vitality. Deep plowing can turn the earthworms and other underground pests to the ground to freeze to death, and can also damage the cotton bollworm and stick. Insects, insects, and other pests of the diverticulidae, aphid nests, to prevent emergence or egg hatching. The winter plowing fields can be plowed as early as possible, and the cotton fields are suitable for plowing from late December to early February. The plowing depth is such that the paddy field can be plowed to the bottom of the plow, but the bottom of the plow can't be excavated. The depth of ploughing in cotton fields is more than 10 cm. The deeper winter tillage, the better pest control effect.
3 scraping skin pest control. Branches painted white. Some of the pests' eggs and cockroaches are hidden in the winter under the old skin of the fruit tree or between the cracks. Therefore, scraping the rough skin and old skin, and applying the whitening agent in time can prevent and control pests and diseases and prevent freezing injury. Spraying a high concentration of lime sulfur or 5% diesel emulsion after scraping can effectively kill pests. The formula of whitening agent is: 10 parts of quicklime, 1 to 2 parts of salt, and 35 to 40 parts of water. Use a small amount of water to turn lime into a paste. Put the salt into it and add the amount of water according to the formula. to make.
4 spraying control. The weeds around the orchard can be sprayed with 2.5% deltamethrin or 20% extinction or 4000-5000 times, or sprayed with 40% xenon ultrafine powder 3000-5000 times to kill a large number of overwintering locusts. , Laodelphax striatus, and fleas and other pests. Spraying or fumigating warehouses that store cotton can eliminate cotton bollworms that have been in winter in warehouses and reduce the incidence of cotton bollworms in the following year.
Overwintering Law and Prevention of Pests
In winter, pests are in the period of hibernation. At this time, it is the weakest link in the viability of pests. If you capture the favorable period in winter and destroy the wintering grounds of pests, you can eliminate pests and eliminate pests even if you do not use pesticides.