First, the symptoms
Both the seedling stage and the adult stage can be infected, mainly affecting leaves, stems, flowers and fruits. In the early stage of the diseased spot on the leaf, it is a water-stained brown spot. It is rounded when enlarged. It has a concentric pattern and turns black when wet. The stem has a brown oval-shaped depression at the node. The petiole is damaged and produces an elliptical wheel pattern. Spot, dark brown or black, generally do not enclose the stem; fruit occurs mostly in the pedicle, forming brown or black plaque, with a ring pattern, easy to cause fruit drop.
Second, prevention and treatment methods
1. Strengthen management Seed disinfection before sowing, soaking in warm water at 50 ° C - 55 ° C for 15-20 minutes. Reasonable close planting, the implementation of more than three years of rotation. Strengthen ventilation, cool down, and drain moisture in the temperature room to avoid high humidity environment.
2. Chemical control for continuous drug control during the growth period, can be sprayed with 58% Jia boxling, or mancozeb 500 times solution, 64% antivirus 矾 400 times solution, 57% chlorothalonil WP 600 times solution, 50 % of the seawater is 1000 times - 1500 times liquid, used in the early stage of the disease, once every 7 days, continuous spraying 3-4 times.
Both the seedling stage and the adult stage can be infected, mainly affecting leaves, stems, flowers and fruits. In the early stage of the diseased spot on the leaf, it is a water-stained brown spot. It is rounded when enlarged. It has a concentric pattern and turns black when wet. The stem has a brown oval-shaped depression at the node. The petiole is damaged and produces an elliptical wheel pattern. Spot, dark brown or black, generally do not enclose the stem; fruit occurs mostly in the pedicle, forming brown or black plaque, with a ring pattern, easy to cause fruit drop.
Second, prevention and treatment methods
1. Strengthen management Seed disinfection before sowing, soaking in warm water at 50 ° C - 55 ° C for 15-20 minutes. Reasonable close planting, the implementation of more than three years of rotation. Strengthen ventilation, cool down, and drain moisture in the temperature room to avoid high humidity environment.
2. Chemical control for continuous drug control during the growth period, can be sprayed with 58% Jia boxling, or mancozeb 500 times solution, 64% antivirus 矾 400 times solution, 57% chlorothalonil WP 600 times solution, 50 % of the seawater is 1000 times - 1500 times liquid, used in the early stage of the disease, once every 7 days, continuous spraying 3-4 times.
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