Pear disease rot is a fungal disease that occurs easily during the cultivation of pears. Recently, rain is concentrated and pear trees are more susceptible to disease. After pear infestation became ill, the leaf curled red, the diseased section of the shoot contracted and sunken, and there was a crack. The phloem tissue became brown and necrotic and must be promptly controlled. Ma Zhifeng, professor of Yangling Vocational and Technical College, suggested starting from agricultural prevention and chemical prevention.
Agricultural control
1 Do a good job of orchard drainage, avoid flooding and water accumulation in the garden, reduce orchard humidity, and prevent the spread of germs along with water. 2 In the near future, agricultural activities in orchards should be minimized to prevent pathogens from adhering to animals, animals, humans, and tools and bring them into the disease-free zone. 3 In the summer and autumn season, fruit trees are trimmed and pruned, and the ventilation and light conditions of the orchard are improved to reduce the humidity in the field. 4 In the winter and spring seasons, field residues, litters, and burns or deep burial should be promptly removed. In the autumn, basal fertilizers were used, mainly organic fertilizers, to improve the tree vigor and enhance disease resistance. 6 If necessary, dig deep and expose the soil to reduce the spread of germs through winter.
Chemical control
The scraping treatment can improve the chemical control effect. When scraping the skin, do not damage the formation layer and scrape it to the white skin layer. The main chemical pesticides sprayed include metalaxyl manganese zinc 400 times, Ledomil 600 times, double-click 300 times, manco-manganese 600 times plus metalaxyl 400 times, and thiram Mn-Zn 400 times. . Spray once at intervals of 10-15 days, add diesel emulsion as a synergist in winter and spring, delay the efficacy and enhance the control effect. During the fruiting period, care should be taken not to spray on the fruits to avoid phytotoxicity.
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