According to Sun Zuowen, a senior agronomist at the Provincial Plant Protection Station, there are various crops such as tomato, eggplant, cucumber, zucchini, strawberry, grape, apple, leek, onion, garlic, etc. that have been infected with gray mold, causing leaf spots and leaves to wither. , stem rot, fruit rot, root rot and seedlings tripped, petals withered and shed early, causing severe death of the whole plant. "If the vegetable grower does not remove the diseased leaves or fruit in time, or throws it directly in the shed after removal, the number of pathogens in the field will continue to increase, or it will be discarded and thrown away outside the shed. It cannot be buried deeply. The amount of gray mold fungus in the entire vegetable growing area It has been maintained at a relatively high level and has maintained extremely high pressure on the entire vegetable cultivation, and it is also likely to cause a large area of ​​botrytis cinerea to occur and spread, Sun said. According to reports, lowering the humidity, raising the temperature, timely release of air, high temperature stuffy shed, watering under the membrane, and timely removal of the diseased branches to the deep burial site will effectively relieve this symptom. Sun Zuowen put forward comprehensive prevention and control measures based on his many years of experience: “Experiments have shown that the use of 300-500 times spray of Trichoderma harzianum can control the Botrytis cinerea up to 80%. Physical measures are to fix the germicidal lamp on the top of the greenhouse. Kill the spores of Botrytis cinerea floating in the air. At the same time, Botrytis cinerea is a typical airborne, multi-infection, circulating disease that, once it becomes prevalent, will cause devastating losses. Therefore, chemical control is to control the incidence of gray mold and reduce it. One of the most effective ways to lose. He reminded that there are great differences in the types and degrees of resistance of different types of fungicides against botrytis in different areas, so effective fungicides should be selected based on the monitoring data of the various areas. “In order to prevent or delay the emergence and development of resistance to fungicides by Botrytis cinerea, we should use drugs early and adopt methods such as mixed use, rotation, etc. It is not recommended that farmers directly use two types of fungicides and mix them by themselves. The compounding agent. The current better mixture is generally a mixture of protective fungicides and therapeutic fungicides, such as gray mold grams, DuPont dry process and so on." Vegetable gray mold drug technology 1, early medication. Before the planting in the shed, the environment should be disinfected. Sulfur fumigation: (10g/m3) can be used to ignite, fuming and sterilizing, sealing for 2 days, ventilation for 2 days, and odor removal before colonization. The colonized seedlings must be screened strictly to ensure that disease-free seedlings enter the shed, and protective fungicides such as 70% mancozeb wettable powder 600 times, or 68.75% easy dispersible granules 1000 times are used before colonization. , Or 25% Amisida 1500 times foliar spray, called medicine into the shed. The first spraying was carried out 15-20 days after the colonization to prevent the contaminants produced by the soil and the sclerotia from infecting the seedlings. The use of the drug can not only delay the occurrence of botrytis, but also save the number of medications and save labor and labor, and it is mainly to prevent and improve the control effect. If no pesticide is applied after planting or during flowering, control must be sprayed before pouring the first ear water. After watering, it is easy to cause serious diseases and serious rot. Therefore, it is necessary to spray the medicine first, and then water it the next day. The focus of spraying is on flowers and young fruit. 2, clever use of drugs. The genus Botrytis is a kind of weak parasite. The residual petal and stigma contains high extravasation sugar, which is the main infestation point of Botrytis cinerea, and the current cultivation technology of tomato cultivars has increased the infestation point of Botrytis cinerea. It is one of the major causes of diseases. In view of this situation, it can be used during flowering, which can reduce the spread of gray mold. Generally, anti-dropping agents are sprayed with 0.1% of Bifomycin or anilinopyrimidine fungicides such as dry process and pyrimethanil. The spraying time is when the tomato blossoms 2-3 on a flowering spike, it can be sprayed once, and about 50% of the flowers are sprayed again. Medicinal pot flowers: Add 0.1% of the above-mentioned agents to the caraway solution to prevent infection at the flowering stage. Pour the first ear before the water application, if no medication after planting or flowering, must be sprayed before pouring the first ear water control. After watering, it is easy to cause serious diseases and serious rot. Therefore, it is necessary to spray the medicine first, and then water it the next day. The focus of spraying is on flowers and young fruit. 3, the use of different formulations of pesticides: after the onset of gray mold, greenhouse protection sites generally use dust at night, aerosols, such as 5% Wan Ling Ling dust agent, or 100 (bacterial) flutter (hydantoin), 100 ( Bacterial clearing and speeding (Kling) aerosols are fumigated. This method of spraying is also very suitable for the prevention and control of grey molds in sheds or shed cultivation, such as leeks and spinach, or during the daytime in greenhouses overcast and rainy days; The use of wettable powder, dispersible granules and other formulations of bactericide spray control, attention should be uniform spraying of the whole plant, spraying intervals of 5-7 days, 2-3 consecutive times, pay attention to the use of different mechanisms of action of the fungicide or complex Formulations, such as 500x dry or 38% pyrimethanil 600-500x spray. Botrytis cinerea is relatively difficult to control in production because of its many hosts, easy to produce drug resistance, and multi-infection cycle, but as long as the incidence of gray mold is known, the resistance class and resistance level of Botrytis cinerea are known. 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Sun Zuowen said that gray mold is a typical low-temperature and high-temperature disease. “The main reason for the serious incidence of gray mold disease in vegetables in protected areas is that in recent years, the focus of vegetable breeding has always been high yield and high quality. The main goal is to prevent breeding of gray mold disease. Due attention is paid to the form of protected land cultivation, which forms favorable conditions for the occurrence of Botrytis cinerea in the winter and is an important external factor in the occurrence of gray mold, and there is an extreme lack of high resistance to Botrytis cinerea in production. It is an intrinsic cause of serious damage to gray mold.â€
