Because the pathogen can be repeated and infected many times, the disease is serious on cloudy days, which directly affects the quality and yield of the fruit.
I. Symptom recognition: Tomato late blight mainly infects fruits and leaves, and also infects stems. The fruit is damaged, and the water surface is dark green stains on the fruit surface, which is nearly round. After the enlargement, the center is dark brown to tan, and the color of the lesion is gradually changed. The diseased fruit is hard, and when the humidity is high, a white mold layer is formed on the lesion. The leaves are infested, starting from the leaf edge or the tip. The water stains of the lesions are dark green and appear brown after expansion. When the humidity is high, there are sparse white molds on the back of the leaves.
Second, prevention and treatment measures: 1, the selection of disease-resistant, disease-resistant varieties. Such as Jiafen, Qiangfeng, Zhongshu No. 4, Zhongcai No. 5, etc. 2, strengthen cultivation management: apply enough base fertilizer, apply more organic fertilizer and phosphorus, potassium fertilizer, avoid excessive application of nitrogen fertilizer, avoid flooding, flooding after rain. 3, rotation: with beans, melons and other non-solanth crop rotation for 3-4 years. 4. Chemical control: After discovering the central diseased plant, it can be sprayed with 58% metalaxyl-manganese-zinc 600 times solution or 75% chlorothalonil WP 500 times solution or 64% anti-bacterial WP WP 500 times solution. Spray once every 6-7 days, even spray 3-4 times.
I. Symptom recognition: Tomato late blight mainly infects fruits and leaves, and also infects stems. The fruit is damaged, and the water surface is dark green stains on the fruit surface, which is nearly round. After the enlargement, the center is dark brown to tan, and the color of the lesion is gradually changed. The diseased fruit is hard, and when the humidity is high, a white mold layer is formed on the lesion. The leaves are infested, starting from the leaf edge or the tip. The water stains of the lesions are dark green and appear brown after expansion. When the humidity is high, there are sparse white molds on the back of the leaves.
Second, prevention and treatment measures: 1, the selection of disease-resistant, disease-resistant varieties. Such as Jiafen, Qiangfeng, Zhongshu No. 4, Zhongcai No. 5, etc. 2, strengthen cultivation management: apply enough base fertilizer, apply more organic fertilizer and phosphorus, potassium fertilizer, avoid excessive application of nitrogen fertilizer, avoid flooding, flooding after rain. 3, rotation: with beans, melons and other non-solanth crop rotation for 3-4 years. 4. Chemical control: After discovering the central diseased plant, it can be sprayed with 58% metalaxyl-manganese-zinc 600 times solution or 75% chlorothalonil WP 500 times solution or 64% anti-bacterial WP WP 500 times solution. Spray once every 6-7 days, even spray 3-4 times.
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