After the apple is bagged, the fruit is in an environment with high temperature, high humidity and poor ventilation, and it is prone to black spot disease. How to correctly prevent the occurrence of the disease, Professor Yang Zongzhong of Yangling Vocational and Technical College gave guidance to the majority of fruit farmers.
The onset of the disease Apple black spot disease appeared in July and August for more than 4 days of continuous rain, and after a few days of high temperature above 32 degrees Celsius, the disease will occur.
Control measures 1. Strengthen integrated management. Reasonable plastic trimming, improve the ventilation and light-transmission conditions of the orchard; remove the large branches and branches of the near-field, raise the trunk and the result part; plant grass between the fruit trees to improve the microclimate in the park.
2. Standard bagging technology. Use high-quality double-layer three-layer fruit-growing paper bag; first open the bag, open the venting hole, the bottom of the bag is facing upwards and set the fruit from top to bottom, let the young fruit hang in the middle of the bag, and the fruit bag sealing should be folded to the one without the longitudinal slit. On the side, avoid rainwater and pesticides flowing into the bag to increase the temperature inside the bag.
3. There is an expired medication science. Before bagging, spray with a fine-hole nozzle; all kinds of pesticides should be diluted twice; the pressure of the sprayer should be sufficient, the atomization should be fine; the nozzle should be upwards, the fruit leaves should be evenly spread; the nozzle should be more than 30 cm away from the young fruit. : Do not use copper preparations, Fumei series and sulfur, etc.; do not use coarse-grained inferior bactericidal powder; do not use diesel, engine oil, mixed emulsifiable insecticides and other pesticides.
4. Spray the medicine carefully before bagging. Before the apple bagging, it should be sprayed twice with 60% Baitai 2000 times liquid, or sprayed twice with 50% Tsuibei 5000 times liquid. Each time spraying, calcium supplement should be added.
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