Apples, grapes, plums, and peaches are the main fruits of my county. The occurrence and control techniques of the major pests and diseases in these fruit trees are described below:
I. Leaf diseases and pests
(I) Leaf diseases
(1) Apple spot disease: It is a fungal disease. Irregular spots form on the leaf surface. The time of occurrence is the growth stage of the new shoot, which mainly damages the young leaves. The effective agent for prevention and control is 10% Polaroid 1000-1500 times or 1.5% polyoxin 300-500 times. Mancozeb, Bordeaux, and green milk have better control effects, but due to the rust effect on young fruits, they should not be used until late May.
(2) Bacterial perforation of peach and plum: It is a bacterial pest, and it becomes a perforation after the diseased foliage. The onset of disease begins in the middle and late May, and the onset of the disease occurs from July to August. In the growing season, use 72% agricultural streptomycin 3,000 times, 4,000 times sulphate sulfate, or zinc sulfate lime solution (zinc sulphate 0.5, lime block 2, water 120) or 70% mancozeb 5,000 times. Spray once a month.
(3) Grape Downy Mildew: This disease is the main disease of grape, which mainly damages the young tissue of the grape, such as the new leaf surface. The back of the damaged leaf produces a layer of white mold, and the fruit can also be damaged. The control medication should be sprayed 1:0.7 before or at the beginning of the disease.
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