Black spot disease occurs mainly from late June to late July. It is hot and humid at this time. After entering the rainy season, black spot disease is most likely to occur. In addition, the crown canopy, especially the high-spindle height cultivation, leads to the orchard being not ventilated. Unreasonable fertilization, no spraying before the bagging + therapeutic fungicide, insufficient calcium before bagging, bagging techniques are not standardized, etc., are easy to cause black spot disease multiple.
To prevent black spot disease, we must strengthen orchard water management. Generally, for every 100 kilograms of high-quality fruit produced, 0.6 kg of pure nitrogen, 0.3 kg of pure phosphorus, and 0.6 kg of pure potassium are required. The decomposed organic fertilizer is applied at a rate of 1 kg of fertilizer per 1 kg of high-quality fruit, and the amount of fertilizer should account for about 70% of the entire year. From mid-June to early July, topdressing phosphorus and potash fertilizers are the main products. With the growth of each period, a 400-fold polypeptin protein solution was periodically mixed with the spray.
Farmers should pay attention to reasonable pruning and improve tree lighting. The double-layer red paper bag produced by a regular manufacturer is used for scientific bagging, so that it can be tight, medium-wide (blanketed), and breathable. Put the young fruit in the center of the paper bag, do not let the young fruit stick to the paper bag so as to avoid sunburn. Twenty days after flowering, it is the first peak of calcium absorption in young fruits. Especially before and after bagging, at least 3 to 4 calcium supplements. Calcium is mainly chelated with amino acids. When bagging fungicide, insecticide, as far as possible to choose the resistance to rain erosion. If it rains or there is dew or if the liquid does not dry, firmly do not bag, wait until the weather turned dry or dew liquid and then bagging.
The key to the success or failure of bagging is whether or not the drug can be used right after it is bagged. Should be carefully and thoroughly sprayed four times the pharmacy: 1. Spray protection 68.75% DuPont e-Bao 1200 times; 2. Spray the systemic fungicide 2% ningnanmycin 600 times; 3. Spraying protective when bagging + Therapeutic bactericide: Ningnan tebuconazole compound 3000 times; 4. Spraying the systemic therapeutic agent timely after bagging + eradicating agent 70% thiophanate-methyl 800+10% difenoconazole 1500 times .
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