Sweet pepper anthracnose occurs in all parts of the country, which seriously affects the yield of sweet peppers, including black anthracnose and red anthracnose. It is the key to timely pesticide control.
Black anthracnose: Both leaves and fruits can be affected, especially mature fruit and old leaves. The diseased spot is brown, watery, and the diseased part is concave. It is oblong or irregular, with a slightly raised concentric ring pattern, and numerous small grain points (conidial discs). Stems and fruit stalks are damaged, the lesions are brown and concave, the shape is irregular, and the epidermis is easily broken.
Red anthracnose: occurs mostly on young fruit and ripe fruit. The surface is covered with a reddish or pink viscous material when wet.
High temperature and humidity, continuous cropping, poor drainage, over-planting, excessive nitrogen fertilizer, poor ventilation, and serious diseases such as viral diseases and sunburns are also serious.
1. Agricultural control: choose disease-free fruits to keep seeds; remove diseased fruits and sick plants and diseased leaves in time after harvest; seedbed and soybean and melon vegetables rotate for 2-3 years; moderate dense planting, 4000-6000 holes per acre, each It is advisable to apply double-planted acupoints; apply sufficient base fertilizer, appropriate application of phosphorus and potassium fertilizer; pay attention to cultivating and weeding; clear ditch drainage, timely ventilation and ventilation; timely control of leaf diseases.
2, chemical control: (1) soak seeds with 55 ° C warm water for 10 minutes before sowing, cooling and sowing. (2) Seed soaking with 50% fungicide carbendazim 500 times for 1 hour. (3) Soaking with cold water for 10-12 hours, then soaking with 1% copper sulfate solution for 5 minutes, adding appropriate amount of slaked lime or ash to mix and wait for acidity to be sown. (4) Spraying 75% chlorothalonil 500-800 times in the early stage of the disease; or 58-500% of metalaxyl manganese zinc 400-500 times. One of the above agents is sprayed once every 7 days for 2-3 times. In addition, 22% chlorothalonil can be used to seal the smoke in the evening, and even smoked 3 times, the effect is better.
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