Blight of potato caused by the occurrence of different parts of the symptoms are not the same, also known as black shank disease (black smuts) and stem canker disease. It is a serious soil-borne disease. The potato sprouts suffered the most serious damage, resulting in black-brown lesions on the buds. The lesions gradually expanded and caused tissue necrosis. Damage to young roots, root hairs, and stolons also manifests as black-brown lesions of necrotic tissue. Stem victim, can damage the catheter system, causing plant wilting, and finally plant death. Most of the diseased plants are dead and dead, so they are called blight. Injuries to tubers occur in different sizes, different shapes, and prominent dark patches.
Control methods: Crop rotation, 3 to 5 years of rotation with non-host crops, use of virus-free disease-free seed potatoes, soil disinfection, and disinfection with quintozene; use 40% of seed dressing or mix Seed WP, ​​50% Benzene WP, seed dressing at 0.2% of seed weight. It is also possible to use 25% of metalaxyl WP and 70% of mancozeb or wet powder to mix 9:1, add 1 500 times of soaking in water, and sow dry after sowing. In the onset of the field, 75% of chlorothalonil wettable powder 1 000 times or 70% of mancozeb wettable powder 600 times can be sprayed and controlled once a week for a total of 2 or 3 injections.
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