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The epidemic disease occurs in the adult stage, and leaves, branches, stems and fruits can be affected. The leaves were infected, the lesions were nearly round, the central dark brown, and the edges were yellow-green. The onset of fruit originated in the peduncle. It was a dark green, water-soaked lesion. Afterwards, it turned soft and rot. When the humidity was high, a white mold layer was produced. After drying, it remained as a stiff fruit on the plant. The branches were infected and showed round brown streaks. The stems are infested, the vascular bundles are brown, and the plants quickly wither until they die. The disease depends on the spread of soil and air and comprehensive prevention and control measures must be taken.
First, a reasonable watering. In July and August, the flowering of chili peppers is a fruitful period. If improper watering or slight carelessness after heavy rain, it will lead to the rapid spread of the disease, resulting in a large number of deaths. It is necessary to strictly control irrigation, avoid flood irrigation and string water irrigation. If you have a good sensation, don't water or pour it.
Second, Irrigation with copper sulfate. When the field is dry and it is really necessary to water, it should be applied in combination with watering to prevent and control the occurrence of epidemics. The method is to apply 1-8% kg of copper sulfate to water before application. Copper sulfate can be evenly spread on the ground (for even use, add some sand), and then lightly watered. Or when watering, dissolve the dissolved copper sulfate evenly at the nozzle. After watering, copper sulfate should be applied at the outlet to prevent the amount of drug at the outlet from becoming less susceptible to disease. 25% Rhizoctonis can also be applied when watering.
Third, spraying. Prevent and control the incidence of field spraying can be sprayed 64% antimony, M8 WP 400-500 times or 25% thithermite 800 times, 50% 1000 times of thiazolycite, followed by spray 75% mancozeb wettability Powder 400-500 times liquid, 60% DC 800 times liquid, 500 times enemy liquid, etc., have good results.
Prevention of hot pepper disease in summer
Chili pepper disease is a devastating disease in the production of peppers. It can develop during the whole growth period of peppers, but it is most vulnerable to the hot peppers after July and August. When the temperature is 25-30°C and the relative humidity is above 85%, the epidemic occurs more severely.