Greenhouse melons and legumes and gray vegetables have increasingly serious damage. The disease has large sporulation, rapid propagation, short onset period, and is resistant to pesticides, often leading to poor drug control. Following the principle of "early, accurate, and changeable" medication can effectively improve the prevention and treatment of gray mold. Strengthen field disease diagnosis early, and use drugs to control before and during the onset. The prevention and treatment were too late, especially after the onset of the disease. The five periods prior to planting, before flowering, flowering, 3-5 days after flowering, and rapid fruit enlargement period of the vegetables are the probable period of gray mold, and should be treated with medicine in time. Flowering period once every 7 days, focusing on flower spray. The results focus on the young fruit spray, both sides of the blade. Apart from spraying the plants, the soil, sheds, walls, and pillars around the plants must also be taken into account when spraying. Phytophthora and other fungicides are applied to the diseased area to prevent the spread of the disease. During the growth period, the incidence of the disease was often observed. The petal and stigma remained on the young fruit were removed in time, and the small leaves covering the fruit were removed to facilitate the fruit to see the light, shorten the condensation time, and reduce the infection of the bacteria. The timely removal of diseased flowers, diseased fruits and diseased leaves was carried out outside the shed and buried or burned. When there was dew in the morning, it was removed with a pellicle pack and the diseased part was removed. According to the local type of gray mold resistance to choose the right agent. At present, there are the following three types of fungicides commonly used in the prevention of gray mold. First, benzimidazole fungicides, such as carbendazim, thiabendazole, thiophanate-methyl, etc., these fungicides still have some effect in some newly developed protected areas. The second is dimethylamides and organic heterocyclic fungicides, such as procymidone, ethidium bromide, iprodione, etc. At present, gray mold pathogens in some areas have produced certain resistance to these agents. Third, carbamoyl drugs and their mixed agents, such as acetylcarbyruvone, acetylthiocarbamycin and so on. These kinds of drugs have better control effect in the areas where B. cinerea produces resistance to benzimidazole fungicides. However, in recent years, the detection has found that in many areas of China, gray mold disease bacteria also produce resistance to these drugs. . The pyrrole fungicide (flucylonitrile, etc.) and the pyrimidine amine fungicide pyrimethanil which are popularized and applied at present have good control effects on gray mold. In addition, biological agents such as polyoxins, pyrimidine nucleoside antibiotics, wuyimycin, and xymycin have good effects on prevention and control of gray mold, and are non-toxic and non-polluting. It is worthy of popularization and application in the production of pollution-free vegetables. Alternately use different types of drugs to reduce the development of pathogen resistance. Before the onset of illness, it can be prevented by drugs such as xymycin, polyoxin, vinyl ribonucleic acid, and diterpene trioctyl alkyl benzene sulphonate. In the early stage of disease, it can be controlled by fludioxonil, iprodione, procymidone and other drugs. Can be used to prevent and treat drugs such as acetylthiocarbamate and pyrimethanil. Rainy days can be controlled by 45% chlorothalonil smoke agent or 10% procymidone smoke agent, or sprayed with 10% procymidone dust or 5% chlorothalonil dust agent per acre, every 7 days once. Pay attention to alternate medications to increase the effectiveness of control and slow the development of drug resistance.
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