“We have a large number of pear trees that grow yellow and long hair. What is going on and how to remedy this?†On June 13th, the reporter saw on a photo of a reader from Shaanxi Wenan from WeChat that the leaves grew up. "Villi", experts said that these insect pests must be quickly controlled, otherwise the entire tree can not escape.
The reporter learned that the illnesses of these pear trees all seem to be similar, with leaf curls, long yellow spots, and dense "fluff." Some of the pear trees with severe conditions began to darken and fall off in large areas, and some individual pear trees had cracked branches and leaves withered.
"This is a disease of fruit trees caused by pear rust. It is transmitted by cypress, cypress, etc., and occurs in both southern and northern fruit producing areas in China. It has certain damage to pear trees and will cause the leaves and pears of pear trees. The occurrence of lesions affects the yield and quality of pear trees,†said Du Zhihui, an expert in plant protection of fruit trees at the Northwest A&F University. After these pears became ill, the fruits did not grow much.
Du Zhihui suggested that due to the fulminant and contagious nature of pear rust, fruit growers should prevent and treat it in time.
Pear rust prevention measures
Pear rust mainly damages the leaves, and the leaves produce orange-yellow dots with yellow-green halo rings. The back of the pear rust rises and the front is slightly sunken, producing more than a dozen yellow hairs.
The onset of the disease occurs once a year. Germination of teliospores begins in March and is damaged by wind and rain.
Control methods: 1 within 5 km of pear orchard, try not to plant cypress, cypress, etc., or in mid-March on cypress, dragon cypress spray 5 degrees lime sulfur agent. 2 spray protection. Spray 1:2:240 (copper sulfate:lime:water) Bordeaux mixture before flowering, or spray 15% triazole copper (triadimefon) powder or emulsion 1000 to 15000 times, or use 40% DuPont Fuxing 8000~10000 times. Liquid (note that pears should not be used during young leaves) or with amine-protecting emulsion 1000 times or thiophanate-methyl 600-800 times, once every 10 days, spray 2 or 3 times continuously. spray. In addition, it is necessary to adopt comprehensive measures such as foliar fertilization, removal of diseased leaves, prevention of other diseases, and application of potassium fertilizer to fruit thinning and roots.
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