Symptoms
When the seedlings became ill, watery stains began to decay at the base of the stems, and the diseased department was dark green, and eventually fell or died. In the adult stage, the leaves begin to appear dark green round spots, the edges are not obvious, and when the air is wet, the lesions expand rapidly, causing the entire leaves to soften. When the air is dry, the lesion stops expanding and the edges gradually become clear. The onset of stems and shoots began to produce dark brown and black streak, the edge is not obvious. The base of the stem is onset, with dark brown and black soft rot and necrosis, which develops from the soil surface down to the surface of the soil, causing the plants to wilt and eventually die. Onset of fruit, mostly from the Department of the Ministry of the fruit, the formation of dark green water spots irregular shape lesions, the beginning of the edge is not obvious, soon after the whole fruit, the color increases, dark green to dark brown, and even fruit and seeds have changed It is brown and when it is wet, a sparse layer of white floc grows on the fruit surface.
The law of incidence
The disease is a fungal disease infested by Phytophthora capsici. The pathogenic bacteria overwintered with oospore or chlamydial spores on diseased plant residues or seeds in the soil. The sporangia produced by pathogens are transmitted by air currents, rainwater, and irrigation water. Sporangia can directly infect and invade the host, and the disease can become popular. High temperature and humidity are conducive to the occurrence and prevalence of diseases. The bacteria can grow and develop at 10～37°C. The temperature is 25～30°C and the relative humidity is above 85%. Continuous rainy days, the accumulation of water in the fields, the wet ground, heavy flooding, flood irrigation, will aggravate the development of the disease.
Control methods
1. Agricultural control. Selection of disease-resistant varieties, such as horn pepper, thin line pepper and so on. In order to implement a rotation of two to three years or more with eggplant vegetables, it is better to use grain fields, crucifers, and legumes. The nursery must use new soil that has not been planted with peppers. The seedbed should be full of organic fertilizer. The seedling age should be about 80 days when transplanting, the plant height should be 15 to 20 centimeters, and 80% of buds should be planted at the time of transplanting. Easy to use Wing Yee Life Slurry roots, can reduce the slow seedling period. Colonization density should be appropriate, 4000 ~ 4500 per acre. Especially after the rain should pay attention to timely drainage and dehumidification, cultivating loose soil, timely removal of diseased fruit, reduce the source of infection.
2. Chemical control. Before sowing, 20% methyl-rhodamine EC can be soaked in 1000-time solution for 12 hours, dried and germinated. During the growth period of pepper, spray 58% metalaxyl MnZn WP 500 times, or 64% antivirus WP 500 times, or 70% EB WP 500 times, or 80% Triethylaluminum phosphate (ethylaluminophosphate, epimedium) 600 times liquid, sprayed every 7 to 10 days, continuous spray 3 to 4 times. In order to reduce the disease resistance, the above pesticides can be used interchangeably.
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