Charcoal disease, also known as late rot, is one of the most important diseases of grapes. Jilin, Liaoning, Hebei, Henan, Shandong, Shaanxi, Sichuan, Yunnan, Hunan, Hubei, Anhui, Jiangsu, Zhejiang, Fujian and other provinces are distributed.
1, the harm symptoms
The main hazards are fruit and fruit stems. When the disease is severe, it can also infect the leaves, tendrils and branches. In the initial stage of infection, water-stained light brown spots appeared on the fruit surface, and then gradually enlarged into a round, dark brown, slightly depressed part of the disease, many small black spots on the top, and arranged in a concentric ring pattern, in the wet conditions, small particles Spots secrete pink viscous material. Especially in the fruit ripening period spread rapidly, the disease fruit gradually dehydration shrinkage, vibration is easy to fall off.
After the stems and cobs were infiltrated, they showed dark brown ovals or prismatic depressions. The growth of the ear was affected, and when the stems were severe, the fruit was dried off.
The bacteria infested the petiole and tender shoots. The lesions were fusiform and dark brown. Pink viscous substances appeared when the air was wet.
a. Elimination of the source of overwintering bacteria combined with winter pruning, removal of the shoots, stalks, nuts and tendrils on the plants, and the litter on the ground, concentrated burned.
b. Strengthen the cultivation and management, increase the organic fertilizer, and leave the branches reasonably, so as to maintain a good ventilation and light transmission conditions on the shelf, and leave no ear under the first wire of the fence.
c. Chemical control Before the germination, spray 500 times the special bacteria or Baume 3 degrees lime sulfur, plus 0.3% sodium pentachlorophenol and other strong fungicides, can receive good results. From the fruit ripening stage, spray 0.1% dexamethasone or equivalent 200 times Bordeaux mixture, 50% tetromycin 600-800 times solution, or 75% chlorothalonil solution 500-800 times every 10-15 days. , spray 3-5 times, you can control the occurrence of the disease.
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