In the spring, before and after flowering of fruit trees, it is a good time to control pests and diseases of fruit trees. Because various bacteria and pests become active after dormancy in this season, the resistance to drugs is poor, and the leaves are not germinated, unobstructed, convenient to apply, and fruit trees are not. If phytotoxicity occurs, the "medical bath" should be promptly prevented.
First, pre-flower control (A) timely spraying a 5-wave US stone sulphur mixture, can control fruit tree rot disease, inhibit winter red spider breeding, has a significant effect on the control of leaf curlers, scale insects. It can also be sprayed with 40% Fumex arsenic 100 times solution. (2) Prevention and treatment after germination. The orchard sprays 45% of the crystal reststone 150-200 times solution, or sprays 3 waves of the stone sulfur mixture plus 50% of the 1605 cream 1000 times solution, which kills more than 90% of the red spider and in the bud. The spores of bacteria such as bai fen disease and deciduous disease in winter can also control chafers and aphids. (3) Prevention and treatment before flowering after germination. Spray 50% of 1605 emulsifiable concentrate 1500 times or 80% of dichlorvos 1200-1500 times liquid, or enemy killing and 2,500-3000 times liquid of veterinary vinegar pesticides, which have obvious control effects on pests and rot.
Second, post-flower control (A) after the flower can continue to spray 0.3 ~ 0.5 Baume degree stone sulfur mixture, control leaves, fruit diseases and red spiders. It can also spray 2500~3000 times of liquid, which can prevent and kill red spiders and kill eggs of leaf-feeding insects and heartworms. (2) Spraying 1:4:20 Bordeaux mixture (1 kg of copper sulfate, 4 kg of quicklime, 20 kg of clean water) 10 to 15 days after flowering, or spraying 40% of carbendazim and 600-800 times of antibacterial Liquid can prevent defoliation, anthracnose and brown spot disease which are prone to rainy and high temperature. (3) Probiotics and dichlorvos are strictly prohibited for one month after flowering.
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