Grape cob brown blight mainly damages young buds, cobs or young fruit, causing it to shrink, dry, causing a large number of flowering and fruit drop. General production cuts are 10%-30%, and when serious, production is reduced by more than 40%.
According to Wu Weimin, an expert on fruit trees in the Institute of Horticulture of the Provincial Academy of Agricultural Sciences, high humidity is the main reason for the epidemic of grape axis brown blight. From early May to early June and early mid-2005, low temperature and rainy weather are conducive to the infection of pathogens. In the flowering period, it is conducive to the spread of the disease in the event of low temperatures and rainy weather. Low-lying vineyards, excessive watering, poor ventilation, poor field management, poor fertility, and weak tree vigor are more serious. Kyoho is a susceptible strain, and new rose, longan, rose and other varieties are more resistant to disease. When the fruit grows to the size of soybeans, the disease stops infestation.
The following measures can be taken to prevent grapevine brown shaft blight. One is to clear the park in time. Remove diseased branches and diseased fruits and destroy them centrally to reduce the source of overwintering bacteria. The second is to wipe shoots. Wipe buds, pick hearts and trim fruit branches in time to improve ventilation and light transmission conditions. The third is reasonable fertilization. Organic manure and phosphorus and potassium fertilizers were added to control nitrogen fertilizers and enhance plant resistance to disease. The fourth is to clear the ditch. Open up a set of ditch to reduce the humidity in rainy fields. Fifth, chemical control. After sprouting of grape buds, lime sulfur was used to spray the resulting mother shoots to eliminate the source of overwintering bacteria. After the grape leaves are fully developed, 80% mancozeb WP, 78% MnZn wettable powder, 50% thiram wettable powder, 50% iprodione wettable powder and other sprays are used, which have certain protection. effect. In the inflorescence separation period and 1 week after flowering, 50% carbendazim WP, 70% thiophanate-methyl wettable powder, 50% sodium nucleus susceptibility suspending agent, and 400 g/l pyrimethanil suspension can be used. Other drugs spray control. When the facilities are cultivated with high humidity, pyrimethanil or procymidone can also be used to smoke. Pay attention to alternate medications to delay the development of pathogen resistance. When spraying the spray nozzle 30 cm away from the drug site, spray evenly.
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