Infecting certain diseases of peppers will cause a large number of leaves of the plants. In severe cases, the whole leaves may be degraded into bald branches. Without leaves, photosynthesis cannot be carried out, and the peppers will eventually die and die, which means severely reduced yield. The leaves of pepper are mainly caused by these four diseases, and the growers should prevent and control them in time.
1. Pepper leaf blight
The biggest feature of the disease is that it develops from the bottom up. The lesions are grayish white with perforations in the middle. When the plants are in the late stage of the disease, the leaves will fall with the stalks and become "light pole commanders".
Prevention and control of pepper leaf blight: It is recommended to spray 10% of difenoconazole 1500 times solution + 20% of thiabendazole 600 times solution, or 20% of crown green (prochlorazin + copper rosinate) 800 times solution.
2. Capsicum bacterial leaf spot
The disease occurred more frequently in the near term, mainly in the upper leaves. In the early stage of the disease, there will be yellow-green water-immersed small spots, which will become rust-colored in the later stage. The leaves will only have the epidermis and appear crisp. The bacterial leaf spot of capsicum develops rapidly under high temperature and high humidity environment, and the defoliation phenomenon is serious in the later stage.
Prevention and control of bacterial leaf spot of capsicum: spraying 2% of added rice (chunleimycin) 600 times solution + 72% of agricultural streptomycin 4000 times solution, or 33.5% of net fruit essence (quinoline copper) 750 times Liquid, can also spray 20% leaf cumin 1000 times liquid.
3. Pepper powdery mildew
Powdery mildew is easier to identify, white powder spots appear on the leaves at the time of onset, and then develop into large patches of powder and covered with leaves, causing severe deciduous leaves.
Controlling powdery mildew of pepper: Spray 25% of acetaminophen 1000 times solution or 30% of ether oxystrobin water 1000-1500 times solution.
4. Chilli white star disease
The key point of the disease is that there are small spots of white near-circle lesions on the leaves, which look like scattered white stars, and the leaves will fall after the onset of the disease.
For the prevention and treatment of capsicum white star disease, 12% of copper rosinate emulsifiable concentrate 500 times solution or 14% of lycopene copper water agent 300 times solution can be sprayed.
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