Walnut sapling expert expert field technology
Lu Dayou, three groups of farmers in Shagou Village, Guanyu County, Qianxi County, asked: I planted more than 60 acres of walnuts through fruit trees, but I discovered that among the newly planted walnut saplings, some of the trees were first bark grayed and then black. Point, when the bark cracks severely, but also black water, and finally the whole plant died. Contacted by this newspaper, Sun Yingmin, the head of agricultural technology promotion station of Guanxi County's Guanhe Township Agricultural Technology Development Center, visited the site to solve the problem. Sun Yingmin the reason This is blackwater disease, which is the most widespread disease in walnut disease. Especially sapling diseases are more prominent. Prevention and control methods Measure 1: Disinfect the roots. With a robust growing disease-free walnut seedlings afforestation, transplanting with carbendazim and other fungicides dip root. Measure two: Do ​​a good job of orchard hygiene. Combine winter pruning and spring buds and bluntness to timely remove diseased branches, dead branches, and dead trees in the orchard and burn them together. Remove timely attachments such as dead branches, fallen leaves, and weeds on the ground, and do a good job of preventing flooding during the rainy season. During the period of soft soil around July, eucalyptus stumps with strong regeneration and sprouting ability were excavated. Measure three: fertilize the soil. Emphasis is placed on cultivating farmyard manure as base fertilizer in winter; during the period from May to May, urea, bicarbonate, calcium, magnesium and phosphate fertilizers are applied as top dressing, with a concentration of 0.5%; the rainy season in June to July may be 20 centimeters from the trunk. Outside digging ring, semi-circular, radial groove top dressing chemical fertilizer; micro-fertilizer generally foliar spray. Measure four: White and white in winter and spring. Whitening agent formulations: 1 quick lime, 6 parts of salt, 0.3 parts of vegetable oil, 0.3 parts of bean flour, 0.8 parts of sulfur powder, 60 parts of water. 2 Lime 10 kg, 100-200 g of salt, 400-500 g of flour, and 40-50 kg of fresh water. 3 1kg of copper sulfate, 3kg of quicklime, 15kg of water, pour the copper sulfate solution into lime milk, and add 0.2kg of flour to the existing equipment. Measure five: Chemical prevention and control. Spray 1:1:200 Bordeaux mixture or 20% lime sulfur mixture 100 times in the early spring; Spray 50% Sanfumei 500-600 times liquid, 77% copper hydroxide 500-600 times liquid to the canopy and internal branches at the end of autumn. Or 10% polymycin 250 to 300 times. Tree-by-tree inspection in winter, the diseased tree strains were immediately sprayed with 10% carbendazim 50-100 times or 25% metalaxyl 100 times immediately after scraping the lesions. Apartment Lock With Code,Portable Apartment Lock,Card Hotel Door Lock,Smart Apartment Lock ChangChun E-vida Technology Co.,ltd , https://www.evidatech.com