The diseases and pests of pear trees mainly include rust, scab, ring rot, melasma, aphids, pear hibiscus, pear borer, beetles, leafhoppers, spider mites, and spider mites. The main control measures in the spring are as follows:
1. Clearing the garden, scraping the bark, and removing the spray shovel before the flower buds in early spring. First spread the plastic sheet under the tree, then carefully scrape off the rough skin and rough skin on the main trunk and big branch, and do not scrape it to the xylem. The thick skin on the branch should be scraped. After the end of curettage, the plastic cloth was collected and the lesions were brought out of the orchard and burned. The fallen leaves and residual dried fruits on the trees were destroyed, and the litters under the trees were cleared out of the orchard for destruction. The whole tree was sprayed with 3 to 5 Baume degrees lime sulfur once.
2, half an hour before flowering, irrigation once. Watering before flowering can reduce ground temperature, delay root activity, postpone flowering, and reduce or avoid the harm of late frost.
3, flower buds before expansion to flowering, the whole tree spray 800 times omethoate and 1500 times the enemy to kill the mixed liquid once, the spray should be uniform, spray to the branches as light rain wet. Before the flowering, 100 grams of soil fungus was applied to the tree tray, and the pesticide was applied to the soil after the application. The pesticide was mixed well with the soil and the pests unearthed during the winter were controlled.
4. At the beginning of flowering period, disperse the soil with methyl parathion by 1:10 evenly under the canopy. The insects focus on spreading the tree, which can kill the beetle in large numbers.
Pear cultivars with severe pear rust can be sprayed with 5 Baumide Lithosulfurizer plus 0.3% pentachlorophenol sodium to kill cypresses on the cypresses in the surrounding cypress (the middle host of the disease) at the end of February or early March. The teliospore; when the pear tree has just spread leaves, it sprays 20% triadimefon 2000 times every 10 days or so and sprays it 3 times. To eradicate the disease completely, it is imperative that there should be no cypress (Pygaceae or Cypress) within 5 km of the pear orchard when the site is built.
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