Apple trees in the dormant pest control focus is: apple tree rot, apple tree ringworm disease, gold moth, leafhoppers and so on. During this period, the pests and pathogens in the orchard ceased their activities and entered the overwintering state, facilitating their concentration and elimination. At the same time, the dormant apple trees are resistant to insecticides, and they can be treated with high concentrations of pesticides. At the same time, there are no leaves on the trees, and pesticides are also very convenient. Therefore, grasping the overwintering prevention and control of apple trees during dormancy can have a multiplier effect.

Agricultural control: First, clean orchards. After the leaves of the tree fall off, the fallen leaves, diseased fruits and weeds are thoroughly cleaned, the stiff fruits are removed, and burned or buried deeply to destroy the pests that have passed its winter. At the same time combined with winter shear, cut off the diseased branches and worm branches. The second is scraping the bark. The pests of Hawthorn leafhoppers, Tetranychus urticae, Pyrosphaeridae, and leaf roller moth are mostly overwintered on rough skin, cracked skin, and cracks. If they can meticulously and thoroughly scrape the rough skin and cracked skin, they can kill 50% to 90% of overwintering pests. . Third, the trunk is painted white. It is best to apply white twice. The first time after defoliation and before freezing, and the second time in the early spring, it mainly protects the main stem, main branch and larger secondary branches and lateral branches. The fourth is deep turning. Before deep-sealing, 20-30 cm deep under the canopy can be used to ripen the soil and eliminate winter pests in the soil, such as peach fruit moth, hawthorn leafhopper, and two-leaf leafhopper. When deep turning, you must turn the lower soil to the upper layer.

Chemical control: Apple tree rot and branch ring rot mainly wipe off the disease after the scraping of lesions or tumors in the early winter or early spring. When scraping the rot, the scraped lesions were fusiform. The width of scraping lesions should be about 1 cm wider than the original lesions, and they should reach the xylem depth to completely eliminate the diseased skin. The tools used before and after curettage should be disinfected, and the scraped belts should be burned out of the orchard. After the scraping of the lesions, it shall be disinfected with 2 to 3 times of citric acid solution or 10 to 20 times of 2% of the agricultural antibiotic 120 or 30 to 50 times of the 5% of the bactericidal agent. . At the same time, in the early spring of each year, the original lesion within 3 years after the curettage should be re-sterilized with the above-mentioned agent. The orchards that are not very serious for apple tree rot disease can also be controlled by spraying the trees before winter or early spring. Agents can be used: Corbicillin or 2% of agricultural anti-120 or 5% bacteriocin clear 100 times; 5 Baume degree of lime sulfur; 5% of bacteria clear 100 times liquid plus Corium 1000 times.

For pest control, before the flower buds sprout in early spring, it is necessary to prevent and control pests of ruthenium, apple overwintering eggs and newly hatched nymphs and apple all-clawed beasts overwintering eggs, beetles overwintering adult females and scale insects. Spray 99.1% Caldrus Dichlorvos EC 20 times or 95% Diesel EC 50 to 80 times or 50% Sulphur Suspension 30 to 50 times or 5 Baume Degree Lithosulfur. (Jinzhong Agriculture Bureau, Shanxi Province)

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