Damage symptoms
The main damage to the leaves will cause the spots to dry and fall off and form perforations, which will lead to early defoliation. The fruit is affected. As the fruit grows, brown spots of 1 mm in size appear on the fruit surface, and the lesions form a continuum and the fruit surface cracks.
Prevention
Apply more organic fertilizer to increase tree vigor and increase resistance to disease. Especially for viscous soil, horse dung or other organic fertilizers should be added to improve the soil.
Reasonable pruning makes the trees well ventilated and light-transmitting. At the same time, the dead branches, diseased leaves and fruit drop must be completely removed, and they must be burned or buried deeply to eliminate the source of overwintering bacteria.
Strictly control the water to strictly control the number of irrigation and irrigation, timely ventilation, in the rainy season should pay attention to drainage.
Spray control If the perforation occurs severely in the previous year, after the nectarine leaf is displayed, spray 45% Dysonammon 800 times, or 72% agricultural streptomycin 2500x, or 3500 times streptomycin sulfate. Liquid or Neophytin 3500-fold, or 50% Formamide 500-fold, or 65%-zein-zinc 500-fold, or 70% mancozeb 500-fold, usually sprayed once every 10 to 15 days , spray a total of 3 to 4 times. In addition, the spray of 1:4:240 (zinc sulphate: hydrated lime: water) zinc sulfate lime solution has good control effect on bacterial perforation, but sometimes it is prone to phytotoxicity, so it is necessary to do community test before use.
Do not apply nitrogenous fertilizers to increase phosphorus and potash fertilizers and cultivate strong seedlings to increase the disease resistance of the plants themselves. Appropriate irrigation, rainy days or afternoon should not be watered to prevent freezing damage.
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