Pollution-free control of spring greenhouse tomato disease

At present, the tomatoes in spring greenhouses have entered the fruiting period. With the increase in the number of top dressings and watering, gray mold, leaf mold, and early blight are rapidly expanding and should be prevented and treated as soon as possible. First, we must strengthen the cultivation and management, and take the necessary agricultural control measures. The watering option is conducted on a sunny morning, and it is not suitable for watering on a cloudy or early evening. Avoid excessive humidity and induce disease. Timely removal of dried leaves and diseased fruit on the fruit surface, appropriate removal of the lower diseased leaves, brought out of the field and buried deep. In terms of chemical control, according to the characteristics of the disease, we choose high-efficiency, low-residue herbal drugs and do not blindly use drugs. At the same time, it is required to stop spraying 10 days before the market of tomatoes to avoid contaminating the fruits. Control of gray mold, use 50% fast-king (or promethazine) 1000 times liquid, 20% silver 500 times liquid, 65% Tamyroxin 600 times alternate spray (focus spray and young fruit), 7 days Spray once, spray a total of 2 to 3 times. Overcast and rainy days, use 15% procymidone smoke agent, 250 grams per acre, in the evening evenly clothed closed shed smoke overnight, according to the disease, 3 to 5 days once, a total of 2 to 3 times smoked. Leaf mold, use 40% DuPont Fuxing 5000 times liquid, 47% Garnett 800 times liquid, 10% Shigeo 1500 times alternating spray control, 7 days, a total of 3 to 5 times. For the disease, 70% thiophanate-methyl 800-fold, 75% chlorothalonil 600-fold, and 70% mancozeb 500-fold were used to control the spray alternately. Rainy days should not be sprayed, switch to 45% chlorothalonil smoke agent (250 grams per acre) closed smoke.

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