After bagging the apples, the fruits are exposed to high temperatures, high humidity, and poor ventilation, making them prone to black spot disease. How to properly prevent and treat the disease, Professor Yang Zong of Vocational Technology Institute of Yangling has provided guidance for farmers.
The rule of onset of apple black spot disease in July and August appeared more than 4 days of continuous rain, after the rain appeared a few days above 32 degrees Celsius, the disease will happen.
Prevention measures 1. Strengthen integrated management. Reasonable pruning to improve air or light conditions in the orchard; to eliminate large branches and branches in the near-field, to raise the main trunk and the resulting parts; to plant grass between rows of fruit trees to improve the microclimate within the park.
2. Specification bagging technology. Select high-quality double-layer three-layer paper bag; open the bag first, open the air hole, and put the bag upside down and set the fruit from top to bottom so that the young fruit hangs in the middle of the bag. The bag seal should be folded to have no longitudinal incision Side, to avoid the inflow of rain, pesticides increase the temperature inside the bag.
3. Has expired drug science. Before the bagging, use a fine nozzle to spray; various pesticides should be diluted twice; the pressure of the sprayer should be sufficient, and the atomization should be fine; the sprayer should face upwards and the fruit leaves should be evenly treated; the sprayer should be more than 30 cm from the young fruit. : Do not use copper preparations, Fumei series, sulfur, etc.; do not use inferior bactericidal powders with coarse particles; do not use diesel oil, engine oil, and mixed pesticides such as EC.
4. Spray carefully before bagging. Before apple bagging, it should spray 2 times 60% Baitai 2000 times liquid, or spray 2 times 50% cuibei 5000 times liquid, every time spraying should add calcium agent.
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