The epidemic of pear black spot disease in the main pear producing area in our province last year caused serious losses, which to some extent dampened the enthusiasm of the fruit farming pear. The reasons are as follows: (1) Rainy, high humidity, and high temperature in spring and summer of 1998 created favourable and popular conditions for pear scab, especially in early July, with large and frequent rainfall, and ten days of rainfall for the calendar year. At an average of three times, after the rain, it encountered high temperatures, and there was a rare sultry weather, which provided an excellent opportunity for the development of pear black spot disease in the previous period; (2) The occurrence of pear black spot disease in most farmers. Lack of preventive ideological preparations. In the last few years, especially in the drought-prone climate of 1997, most of pear pears suffered from scabs and caused farmers to breed numbness; (3) Some fruit growers who valued prevention and control were not caught. During the critical period of prevention and control, when the symptoms of disease have been seen in a large number of cases, the patient is "impatiently rushed into the doctor's office," blindly taking medication. Although continuous spraying has prevented and cured, he has not achieved the desired results. Some other farmers have seen that the disease has already occurred, or lost confidence in winning, or due to financial constraints, gave up the prevention and let it develop. Here I would like to tell the fruit farmers that pear scab is a common disease. Careful prevention and control can be controlled or mitigated, and it is definitely not an "incurable disease." First of all, I would like to make the following predictions about the occurrence of pear black spot disease in the province this year: Due to the occurrence of pear black spot disease in 1998, the amount of bacteria that passed through the winter on diseased shoots, bud scales, diseased leaves, and diseased branches was extremely large. The basis of the disease, if the April-May rain is too high, it can meet the demand for temperature and humidity of the disease, so that pear black spot disease occurs again. Because the conditions of epidemic diseases are not harsh, the humidity required for the conidial germination of pathogens is more than 70%. The invasion of pathogenic spores requires only one precipitation of more than 5 mm. The temperature of the disease is 11–20°C. It is easier to meet. Even in the event of spring drought, the closed microclimate conditions of densely planted orchards can basically meet the needs of the disease. If prevention and control are relaxed, it may still cause the relapse of the disease. Therefore, it must be based on careful prevention and control. In order to reduce the amount of overwintering bacteria and control the initial infestation of pathogens, on the basis of thoroughly clearing the gardens in the winter, before spring pears germinate, spray the medicine with the role of eradicating the germs once, and use urea 10-20 times solution, or Ammonium sulfate 10-20 times, or 12.5% ​​speed Poly WP 1500 times. After the pears were germinated, they were sprayed 1:2:200 times Bordeaux mixture respectively before and after flowering. Bagging is an effective way to prevent the damage of pear fruit. It should be completed before the wheat harvest. Before bagging, it should focus on the pear fruit spray once 12.5% ​​speed Baoli WP 2500-3000 times, in order to uniform and thoughtful. Special mention should be made of high-quality, breathable paper bags, which should have vent holes at the bottom two corners and in the center.
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Pear scab is not "incurable"