Late blight is one of the main diseases of tomato. When it occurs, the disease will spread and spread quickly, which often causes great losses to vegetable farmers. It is necessary to pay attention to early prevention and treatment of late tomato late blight.
A plot susceptible to late blight: the disease is a fungal disease that can be spread by means of wind, rain, or watering. If the following conditions exist in the tomato field, early warning should be taken to prevent late blight. 1 Tomato land planted near the potato field. 2 Tomato land planted near protected areas (eg, solar greenhouses, plastic greenhouses, etc.), and tomatoes are also planted in the protected areas. 3 Partial application of nitrogen fertilizer, tomato plants growing too densely. 4 Tomato land with low terrain, poor drainage and poor ventilation. 5 After the autumn extension (or wheat bran) tomato seedlings, the seedlings are planted too densely, and the seedlings (or seedlings) are not timely; or the terrain is low, there is no nursery for the shade shelter. 6 When planting seedlings in the field, mix the tomato land that has been infected with late blight seedlings. When the temperature is between 18 and 22 ° C, in the case of rainy days, or foggy and dewy days, these plots are fast and heavy.
Typical symptoms of late blight: 1 seedling stage. Water-soaked dark green to brown irregular shaped lesions appear on the leaves and spread to the stems, turning dark brown near the petiole, causing the young stems to rot, causing the seedlings to fall and die. When the humidity is high, the lesions are long. White mold. 2 adult stage. Leaves: Mostly from the tip or leaf edge of the lower leaves of the plant, the first appearance of water-soaked dark green irregular shaped lesions, the posterior lesions become brown, and when the humidity is high, the back of the leaves can be seen to be 1 to 2 mm wide. White mold; when dry, the diseased part is blue-white, dry and brittle. Stem: The diseased stem has a water-soaked dark brown irregular shape with slightly concave lesions. When the disease is heavy, the lesion is dark brown and spoiled, causing the plant to wilted or break from the corruption. Green fruit: water-soaked gray-green hard spots appear on the fruit surface, then become dark brown or tan, cloud-like, with obvious edges, a small amount of white mold, usually not soft rot.
Measures to prevent late blight: 1 Strengthen water and fertilizer management. After entering the results period, look at the sky, see the ground, see the growth of the plant, water the right amount, keep the ground moist, can not be watered by large water, to avoid raining days after pouring the ground, after the heat and thunderstorm, apply the well water to pour; After harvesting fruit, combined with topdressing nitrogen fertilizer, 50 kg of plant ash per 667 square meters, or 10 kg of potassium chloride, applied 1 or 2 times to improve the disease resistance of the plant. 2 Improve ventilation conditions. In the sunny morning, you can pruning, snoring and picking old leaves at the right time. 3 spray prevention. Spraying metalaxyl, metalaxyl, manganese zinc, aluminum triethylphosphinate, anti-virus cockroaches and other systemic fungicides before use or before rainfall (see below for concentration). 4 Remove the source of infection. Early removal of the diseased leaves, diseased fruits, and diseased plants of the initial onset, and bagged and transported to the field for deep burial. 5 spray control spread. Once the lesions are found in the field, spray the whole field, using 1:1:200 Bordeaux mixture, or 40% aluminum triethylphosphinate wettable powder 250 times solution, or 50% nail cream? Copper wettable powder 800 times. Liquid, or 25% metalaxyl WP 1000 times solution, or 64% chlorpyrifos WP 500 times solution, or 72% WP 1500 times solution, or 58% metalaxyl? Manganese zinc wettability Powder 500 times solution, or 72.2% Puli water agent 1000 times solution sprayed the plant, spray once every 7 to 10 days, even spray 2 to 3 times, spray liquid 50 ~ per 667 square meters area 75 kg, leaf back, stalk, green fruit, etc. should be sprayed everywhere, the middle and lower parts of the plant are the key spray areas, to be rotated, pay attention to the safety interval of each pesticide. 6 irrigation roots. 50% nail cream? Copper wettable powder 600 times liquid, or 60% succinyl phosphine aluminum wettable powder 400 times liquid, roots per plant, 300 ml per solution, once every 10 days, even Drain 3 times.
A plot susceptible to late blight: the disease is a fungal disease that can be spread by means of wind, rain, or watering. If the following conditions exist in the tomato field, early warning should be taken to prevent late blight. 1 Tomato land planted near the potato field. 2 Tomato land planted near protected areas (eg, solar greenhouses, plastic greenhouses, etc.), and tomatoes are also planted in the protected areas. 3 Partial application of nitrogen fertilizer, tomato plants growing too densely. 4 Tomato land with low terrain, poor drainage and poor ventilation. 5 After the autumn extension (or wheat bran) tomato seedlings, the seedlings are planted too densely, and the seedlings (or seedlings) are not timely; or the terrain is low, there is no nursery for the shade shelter. 6 When planting seedlings in the field, mix the tomato land that has been infected with late blight seedlings. When the temperature is between 18 and 22 ° C, in the case of rainy days, or foggy and dewy days, these plots are fast and heavy.
Typical symptoms of late blight: 1 seedling stage. Water-soaked dark green to brown irregular shaped lesions appear on the leaves and spread to the stems, turning dark brown near the petiole, causing the young stems to rot, causing the seedlings to fall and die. When the humidity is high, the lesions are long. White mold. 2 adult stage. Leaves: Mostly from the tip or leaf edge of the lower leaves of the plant, the first appearance of water-soaked dark green irregular shaped lesions, the posterior lesions become brown, and when the humidity is high, the back of the leaves can be seen to be 1 to 2 mm wide. White mold; when dry, the diseased part is blue-white, dry and brittle. Stem: The diseased stem has a water-soaked dark brown irregular shape with slightly concave lesions. When the disease is heavy, the lesion is dark brown and spoiled, causing the plant to wilted or break from the corruption. Green fruit: water-soaked gray-green hard spots appear on the fruit surface, then become dark brown or tan, cloud-like, with obvious edges, a small amount of white mold, usually not soft rot.
Measures to prevent late blight: 1 Strengthen water and fertilizer management. After entering the results period, look at the sky, see the ground, see the growth of the plant, water the right amount, keep the ground moist, can not be watered by large water, to avoid raining days after pouring the ground, after the heat and thunderstorm, apply the well water to pour; After harvesting fruit, combined with topdressing nitrogen fertilizer, 50 kg of plant ash per 667 square meters, or 10 kg of potassium chloride, applied 1 or 2 times to improve the disease resistance of the plant. 2 Improve ventilation conditions. In the sunny morning, you can pruning, snoring and picking old leaves at the right time. 3 spray prevention. Spraying metalaxyl, metalaxyl, manganese zinc, aluminum triethylphosphinate, anti-virus cockroaches and other systemic fungicides before use or before rainfall (see below for concentration). 4 Remove the source of infection. Early removal of the diseased leaves, diseased fruits, and diseased plants of the initial onset, and bagged and transported to the field for deep burial. 5 spray control spread. Once the lesions are found in the field, spray the whole field, using 1:1:200 Bordeaux mixture, or 40% aluminum triethylphosphinate wettable powder 250 times solution, or 50% nail cream? Copper wettable powder 800 times. Liquid, or 25% metalaxyl WP 1000 times solution, or 64% chlorpyrifos WP 500 times solution, or 72% WP 1500 times solution, or 58% metalaxyl? Manganese zinc wettability Powder 500 times solution, or 72.2% Puli water agent 1000 times solution sprayed the plant, spray once every 7 to 10 days, even spray 2 to 3 times, spray liquid 50 ~ per 667 square meters area 75 kg, leaf back, stalk, green fruit, etc. should be sprayed everywhere, the middle and lower parts of the plant are the key spray areas, to be rotated, pay attention to the safety interval of each pesticide. 6 irrigation roots. 50% nail cream? Copper wettable powder 600 times liquid, or 60% succinyl phosphine aluminum wettable powder 400 times liquid, roots per plant, 300 ml per solution, once every 10 days, even Drain 3 times.
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