Chili and prevention methods of leaf spot symptoms
Pepper leaf spot symptoms'
The main harm of blade.
Leaf spots appear on the leaf is back on both sides, suborbicular to oblong or irregular shape, size 2 ~ 12 mm, adaxially disease spot light brown to tan, humidity is big, the corresponding parts back with dense film to nearly black velvet, disease spot is, back sides surrounded by dark brown fine coil, some still living in the peripheral light yellow halo.
The cause of 】
For fungal disease, the disease pathogen is pepper color chain across the spore.
Germs can wintering on seeds, also can hypha block on the sick body or to hypha wintering on sick leaves, become the source of infection in the early the following year.
The disease often begins with seedbed.
Long time high temperature and high humidity, conducive to extend the disease.
Method of prevention and cure,
Thoroughly remove invalid plants and leaves after harvested, the centralized burning.
Every year rotation and other vegetables.
The early onset of spraying 50% generation's ring wettable powder 500 ~ 600 times liquid or multiple bordeaux mixture 1:1:20 0, 75% chlorothalonil wettable powder 500 ~ 600 times liquid, 50% more?
Sulfur suspending agent or 36% methyl sulfur bacteria spirit suspending agent more than 500 times liquid, 50% mildew (
Carbendazim plus mildew)
Wettable powder 1000 times liquid, can kill 77% wettable powder 400 ~ 500 times liquid, every 7 to 10 days, prevention and treatment of 2 ~ 3 times in a row.
Discontinued 7 days before harvest.
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