Control measures for black spot of pepper
Ningbo Mywin Caster Co., Ltd. , https://www.mywin-caster.com
September 27 19:07:59, 2023
First, the symptoms of the disease
When the capsicum fruit matures, dark green oily spots appear on the diseased fruit. In the rainy weather, the whole fruit rots rapidly except the epidermis; under the dry condition, oily lesions are formed, which are about 2-3 cm or larger. It gradually turns brown, and bacterial necrotic spots are obvious. The diseased part is often infected by Alternaria alternata, which is easy to be mistaken for the original pathogen. The disease is more harmful in Inner Mongolia, especially in farming.
Second, the route of transmission and the disease conditions
Overwintering in diseased fruits or seeds that have fallen off in the field has become a source of infection for the spread of the disease. It spreads through irrigation water during the growing season, and is conducive to the spread of the disease after the rain. The hot and rainy seasons in July and August spread rapidly, and the temperature dropped after September. The disease spread has stagnated.
Third, the prevention and treatment method
(1) Physical Control
1. It is carried out for 2 to 3 years with cruciferous vegetables such as non-sweet (spicy) pepper and cabbage.
2, leveling the land, the north should use the scorpion, the south is planted in the high bay deep ditch. Drain water in time after the rain to prevent water accumulation and avoid flooding.
3, seed disinfection, seeding with seed weight 0.3% of 50% succinic acid copper WP or 50% dikesone WP powder seed dressing.
4. Remove the sick body in time after harvest or deep turn in time.
(II) Pharmacy Control
At the beginning of the disease, spray 50% succinic acid copper WP 1500 times solution, 27% copper high suspension agent 600 times solution, 53.8% can kill 2000 dry suspension 1000 times solution, 1: 1: 200 times Bordeaux Liquid or 72% agricultural streptomycin sulfate soluble powder or streptomycin sulfate 4000 times solution, 47% garnipin wettable powder 800-1000 times solution, 30% basic copper sulfate (green depot) suspension agent 400 times solution , once every 7 to 10 days, continuous control 2 to 3 times. The medication was stopped 3 days before harvesting.
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