Winter control of common fruit tree pests
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With the advent of the cold season, various pests that harm fruit trees have gradually ceased their activities, and they have chosen suitable sites for wintering to hide and hide in order to survive the cold winter. There are two characteristics of wintering pests: First, there is a fixed overwintering state, and second, there are specific wintering sites. Therefore, grasping the wintering habits of pests, seizing their weak links, and taking measures to eradicate pests and reduce the sources of pests can yield a multiplier effect. The following briefly describes the overwintering habits and control methods of several major pests: 1. Picking small boreal worms over the canopy of the mature larvae in the soil under the canopy. The wintering larvae began to unearth activities from late April to late May of the following year. Control methods In the initial stage of the exhumation of overwintering larvae, use 50% phoxim emulsion 200 times solution or 50% methylisotriphosophospate 300 times solution to spray the orchard soil and spray the surface soil with hoe. Use 100 kg of liquid per 667 square meters. If the density of insect population is large, spray it again every 20-30 days. 2. The pear borer larvae sloughed in the gaps in the bark between the mature larvae and the larvae in the early April of the following year. Control methods Before the fruit sprouts in the early spring, the old rough skins on the trunk and the stems are promptly scraped, and the danders are collected and burned. 3. P. grandiflora bores small larvae in the buds of fruit trees for wintering, and late spring begins to sprout with the sprouting of tree buds, and turns buds to harm the sprouts. Prevention methods can be combined with fruit tree winter cuts, carefully cut off the bud shoots, or in early spring to check the tree buds, found that there are early after the removal of buds, destroy it before turning bud damage. 4. The small leaf roller moth hides and hides in the dead skin around the old bark, wavy skin, and large sawn cuts. When winter buds sprout, the overwintering larvae are active. Prevention and cure methods Before the sprouting of the buds in the early spring, the rough old skin on the stems and the sawn cuticles were completely scraped off and collected and burned. It is also possible to spray 80% of the dichlorvos emulsion 1000 times on trunks and stems in the beginning of the overwintering larvae's outbreak. 5. P. caterpillars overwinters as small larvae in the thick trunk gap. Most of the winter in the soil near the trunk of the saplings, late spring and fruit buds sprouting activity. Prevention and treatment methods In the early spring, the coarse skin and cracked skin on the branches are scraped off and collected and burned. The young garden can be used to exterminate the soil around the dry base. 6. Hawthorn spiders use adult females to overwinter in bark cracks and dry top soil. The following spring, with the expansion of tree buds, there are activities. Prevention and cure methods The trunks of old trunks were scraped off in time before the sprouting of fruit trees in early spring, and burned after being concentrated. It is also possible to spray 3 to 5 Baume degrees of lime sulfur before germination to kill a variety of pests and diseases.