Gray mold control technology

Gray mold control technology

The internal temperature and humidity and other environmental conditions of the greenhouse, which are different from bare soil, provide favorable conditions for the occurrence of certain diseases and insect pests. Among them, gray mold is the most typical, and there is a tendency to increase year by year. Control methods: (1) Biological control with 300-600 times dilution of xylem to prevent and treat botrytis cinerea is effective, and it is non-toxic and non-polluting. It is worth promoting in the production of pollution-free vegetables. (II) Comprehensive Prevention and Control 1. Use resistant varieties. 2. Clean the greenhouse, remove the diseased flowers, leaves, melons and stems of the eggplant and melon vegetables in a timely manner and bring them out of the field to burn or bury them in order to reduce the bacteria source. After each harvest of leeks, the scraped leaves of the stubs were cleaned up and burned to reduce pathogens. 3. According to the weather conditions outside the shed, reasonable ventilation, reduce the humidity and leaf area exposure time. 4. Apply organic fertilizer, apply nitrogen, phosphorus and potassium reasonably and control the amount of nitrogen fertilizer. 5. Proper close planting to ensure ventilation and light transmission. Adding "Telik" 500 times liquid in the tomato squid's potion and then decorating the flower can control gray mold. Extract the petal and stigma of young tomato fruit 7-15 days after tomato flowering (10-20 mm diameter of young fruit), and spray 1-2 times of “Telik” 500 times when the young fruits of each layer reach the green fruit stage. , can prevent fruit gray mold. The double ridge film-covered and drip-water cultivating methods not only increased the soil temperature, but also significantly reduced the relative humidity in the shed, thereby inhibiting the occurrence and reinfestation of Botrytis cinerea. For opponents, strawberries should be deep trenches, covered with a plastic film, generally 0.35-0.4 m deep, and covered with mulch on both sides of the gutters to reduce the incidence of fruit and soil contact and accelerate drainage. Harm. Sparse excess buds, flowers, fruits, and appropriate removal of old leaves, and bring them out of the field for centralized treatment. 6. Non-mining fruit vegetables are exchanged for 2-3 years. (III) Chemical Control Control period. The appropriate period for the control of pesticides is to use two kinds of medicaments in the two stages of seedling stage and flower and fruit stage and alternately. The technical points are as follows: (1) Pay attention to the control of seedling stage. That is, it is better to use the drug before the first peak of gray mold. 2 strengthen flower and fruit control. That is, during the second peak of gray mold (mid-February-March, beginning of flowering period), interval 7-10 days (depending on the pesticide species) continuous medication for multiple times, preserved flowers. It must be emphasized that the flower and fruit period is a key period for prevention and control. For leek gray mold, chemical control should seize the appropriate period of infection, focus on the protection of the second crop of spring leek second, three knife and 6-8 days after cutting medication. 2. Suitable medicaments. 1Special fungicide: Benzoimidazole (BCM) carbendazim, thiophanate-methyl, extinct dust, etc.; dimethyl imide (SMX) and its compounding agent. ), Acetaminophen (Iprodione), Nongrill, Profit (including wettable powder, smoke agent, dust) Sclerotium net, Gray mold, etc.; Carbamate (CFT) and its compound A Ling, Duo Ling Ling, Wan Wei Ling (Bike Wei) dust and so on. 2 Protective agent: It has preventive effect, such as chlorothalonil (containing wettable powder and smoke agent), Dasheng, mancozeb, and captan. In recent years, various pesticides (or dosage forms) have been developed and tested in various places to prevent and control botrytis, and good results have been achieved. For example, the chlorothalonil-containing tobacco smoke agent used to prevent and cure Botrytis cinerea for two times, the effect can reach 84-100%; 6.5% of thiobacillus can prevent and cure tomato gray mold for 2-3 times, the effect is more than 78%; The effect of 41.8% Tecpo emulsion suspension on control of gray mold of leek was up to 91.1%, which was significantly higher than that of rapid keratin; 25% of ash was effective in controlling greenhouse tomato leaf and fruit gray mold; about 80%; 28% The effect of grey mold in preventing and curing botrytis cinerea in greenhouses is generally more than 90%; 40% of pyrimethanil suspension is used in 3-4 times of the control effect against cucumber gray mold is more than 80-90%; 3% of botrytis cinerea After 3 doses of medication, the control efficacy of tomato, amaranth, kidney bean and other gray molds was generally over 90%. The effect of 6.5% vanadin ultrafine dust on 3 times control of tomato and leek gray mold was also 80%. the above. Different types of drugs should be used alternately to reduce the resistance of pathogens and reduce the effectiveness of control. Must be timely and accurate medication.

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