Chili peppers cause a lot of defoliation due to infection and disease. In severe cases, the leaves of the whole plant are stripped into bald branches. Without leaves, photosynthesis cannot be performed, and the plants eventually fail and die. There are four kinds of diseases that cause common defoliation in peppers:
1. Leaf blight.
The greatest feature of the disease is the development from the bottom up, the lesions are gray and white, there are perforations in the middle, and the bottom of the stalk is shaken by hand at the end of the onset, and the blade “哗哗†falls down and becomes “Commander of the polished rodâ€.
For prevention and treatment of the disease, it is recommended to spray 10% Difenoconazole 1500 times + 20% Thiobacillus copper 600 times, or 20% Guanlv (Prochloraz + Copper rosinate) 800 times spray.
2. Bacterial leaf spot.
The disease occurred more in the recent period, mainly in the upper leaves. In the early stage of disease, yellowish-green water-soaked spots appeared on the leaves, and later lesions became rust-colored, and they were thin and brittle due to the loss of leaf-meat and only the epidermis. The disease develops rapidly under high temperature and high humidity conditions. The late leaves are seriously degraded. The vegetable farmers commonly call the disease a "bacterial yellow shooter."
Spray 2% of rice (Kasugamycin) 600 times liquid + 72% of agricultural streptomycin 4000 times liquid, or use 20% Yezizole 1000 times or 33.5% net fruit essence (Quinoline) Copper linoleum) spray 750 times.
3. Powdery mildew.
Powdery mildew is relatively easy to identify. White powder spots appear on the leaves at the time of onset, and large patches of pink spots develop in the later stages, covering the entire leaves, causing serious defoliation.
The prevention and treatment of the disease can be sprayed with 25% of the 100 times of the pyrimidine or 30% of the aqueous solution of the oxastrobin from 1000 to 1500 times.
4. White disease.
The main point of the disease is the near-circle shape of lesions on the leaves, white dots, which look like scattered white stars, and cause a large number of fallen leaves at the late stage of disease.
The prevention and treatment of the disease can be sprayed with 12% copper rosinate 500 times solution or 14% urinary ammonia copper solution 300 times.
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