Grasping and controlling cotton leaf spot
2022-08-28 08:05:07
Cotton keratosis is a bacterial disease that can occur from the cotyledon stage to the adult stage. First, a dark green spot is produced on the back of the leaf. Later, it is gradually enlarged by the veins to form a polygonal oil-like lesion. Transparent. When the bacteria is thick and damp, it is a yellow-brown sticky substance, which is white and dry after drying. When the disease is heavy, the leaves may be dry and fall off. If the lesion on the leaf is moved to the light, it looks like oily paper.
There are two main causes of the disease: First, continuous cropping, the disease caused by the disease in the soil caused by the disease: Second, from July to early August, more rainy weather, hot weather; poor light, high humidity, high temperature, some cotton fields also suffer The disaster caused by the disaster, the cotton branches and leaves are damaged, which is conducive to the infection of the bacteria.
Control methods: 1. Clean the cotton field, remove the diseased branches such as the branches and old leaves in the cotton field in time, and burn them out or bury them in depth. 2. Balance fertilization, especially nitrogen fertilizer should not be applied too much. 3. Reasonable irrigation and drainage, when flooding water is not suitable for flooding, flooding water in a timely manner after rain, ploughing and ploughing. 4. In the early stage of the disease, spray with 65% sensible zinc WP 600 times, or use 72% agricultural streptomycin soluble powder (10 million units) per acre to add 50 kg of water, or use 50% carbendazim or 70%. Tobuzin 1000 times liquid spray, spray once every 7 to 10 days, continuous spraying 2 to 3 times.
There are two main causes of the disease: First, continuous cropping, the disease caused by the disease in the soil caused by the disease: Second, from July to early August, more rainy weather, hot weather; poor light, high humidity, high temperature, some cotton fields also suffer The disaster caused by the disaster, the cotton branches and leaves are damaged, which is conducive to the infection of the bacteria.
Control methods: 1. Clean the cotton field, remove the diseased branches such as the branches and old leaves in the cotton field in time, and burn them out or bury them in depth. 2. Balance fertilization, especially nitrogen fertilizer should not be applied too much. 3. Reasonable irrigation and drainage, when flooding water is not suitable for flooding, flooding water in a timely manner after rain, ploughing and ploughing. 4. In the early stage of the disease, spray with 65% sensible zinc WP 600 times, or use 72% agricultural streptomycin soluble powder (10 million units) per acre to add 50 kg of water, or use 50% carbendazim or 70%. Tobuzin 1000 times liquid spray, spray once every 7 to 10 days, continuous spraying 2 to 3 times.
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