Grape white rot, also known as ear rot disease, is a major disease commonly occurring in grape growing areas in China. Years of continuous rain and rain often cause a large amount of ear rot, which has a large impact on later yield. For many years, affected by the special weather conditions in May-June, white grape rot in Shanghang County has been more serious, causing greater losses to farmers. The main characteristics of white rot in grapes are described as follows:
The white rot of grapes is characterized by the fact that the disease is caused by the infection of the fungus Penicillium sp. The main damage ear, often near the ground first ear disease, the incidence of fruit stems began to spread along the fruit pedicle to the fruit. At the beginning of the disease, the stems and cobs of the disease appear light brown irregular water-stained lesions and gradually spread to the fruit. After a few days, the particles turn brown and rot, with a special mildew, fruit stems dry and shrink, easily fall off; some water loss Dried fruit, dry and stiff spikes often hang on branches after winter does not fall. According to the investigation of planting in our county, there are differences in the anti-inductive susceptibility of different species, Jinhuateng and Shengtuo are more susceptible, and the United States and Zifeng are more resistant to disease; in the same park, the middle and lower layers of the scaffolds are seriously ill and the upper layer The incidence is lighter. The suitable temperature for the development of pathogenic bacteria is 25～30°C. High temperature and high humidity are the most important conditions for the occurrence of the disease. Over the years, affected by the special weather conditions from May to June, the incidence of white rot in grapevines in Shanghang County is relatively serious, generally in June. In the first half of the year, the grapes begin to color before they begin to colorize. If the coloration period in the middle or late June is rainy, white rot often occurs in late June, and the incidence peaks in early July. Some vineyards have a serious disease rate of 100%. The rate of more than 30% brings greater losses to farmers.
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