In recent years, the planting area and yield of cold lettuce in our province have been relatively stable, and the benefits are also good. However, due to the influence of heavy cultivation, the three major diseases on lettuce - downy mildew, virus disease, and brown spot disease have been difficult to control. Increase. The following combination of the author's experience, on the comprehensive control measures of the three major diseases of lettuce, and farmers friends to make an exchange.

Downy mildew

Control measures: Select disease-resistant varieties, implement crop rotation or intercropping, strengthen field management, leveling and sorghum cultivation, use sorghum cultivation, in order to facilitate drainage and dehumidification, prevent flooding, properly dense planting, diligent weeding. Remove the diseased leaves from the lower part of the plant in time, and increase phosphorus and potassium fertilizers as appropriate. 58% of metalaxyl MnZn wettable powder can be used at the beginning of onset, 600 times of 72.2% of Proplocarb can be 600 times, or 69% of Dimethomorph MnZn can be used as wettable powder 600 times, or 50% of Johnson Aqueous ammonium agent 1000 times, or 5% chlorothalonil WP wettable powder 500 times and other agents spray, spray once every 7 days, and even spray 2 or 3 times. The drug is preferably used interchangeably.

Viral disease

Prevention measures: strengthen management. Adjust the sowing date according to local conditions, so that appropriate sowing. Seedlings at the seedling stage should be carefully watered to avoid excessive seedlings. The foliar fertilizer is sprayed in an appropriate period to promote the early growth of the plant. Prevent flooding, reduce disease occurrence. In the early stage of disease, it can be used as follows: 1.5% plant disease and disease emulsion 1000 times, or 0.5% mushroom proteoglycan water solution 300 times, or 20% hydrochloric acid morpholinium copper acetate wettable powder 500 times, or 5% mycorrhizal water solution 200 ~ 300 times liquid, or 2% nannanmycin agent 200 ~ 300 times liquid spray control. Spray once every 5 to 7 days, and spray 2 or 3 times.

Brown spot

Prevention measures: Balanced fertilization to maintain robust growth of plants and enhance disease resistance. Pay attention to the health of the field and timely collect the sick and bring it out of the field and burn it. 70% chlorothalonil wettable powder 600 times, 50% procymidone wettable powder 1000 times, 50% vanillin wettable powder 400 times, or 40% polysulfide suspension 500 times Liquid, or 80% thiophanate-methyl wettable powder 1000 times liquid spray control, spray once every 7 days, and even spray 2 or 3 times.

Eggs

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