Grape Cob Brown Blight and Its Control Techniques

Grape brown ear blight is a new disease of grape. In recent years, it has been serious in Liaoning, Shandong, Hunan and other places. Grape vineyards with serious grape diseases in Liaoning have more than 50% disease incidence and a 20% to 30% reduction in disease incidence.
1) symptoms. Grape cob browning mainly occurs on the cobs of grape young ears, and cobs are generally not susceptible to disease after aging. In the early stage of disease, the branching and cob of young panicles turn brown and gradually wither, and soon they lose water and dry up, turn into dark brown, and the ear wilting and falling off. When the weather is wet, black moldy material is produced on the surface of the diseased part, which is the conidial stem and conidia of the pathogen. In the late onset, the dry branching cobs are often blown off and shed from the branches. The young fruit granules develop a round, dark brown to dark brown spot with a diameter of about 2 mm. The lesions are limited to the fruit epidermis. As the fruit swells, the lesions become scab-like, when the fruit grows to medium-sized. Hours, sore shedding, no significant effect on fruit development. The disease can also infect the corolla when the flowers are open.
2) Incidence conditions. The climatic conditions have a greater impact on the disease. From late April to May (ie, the grape's young panicle blossom stage), the disease will be severe if it encounters low temperatures and heavy rain. In addition, there was a significant difference in resistance to grape brown leaf blight between grape varieties. Jufeng, etc., were the most serious diseases, followed by black Olin and red bananas; Older trees are more severe, young trees (2 to 3 years old) have a lighter disease, and low-lying areas and surrounding buildings have heavy orchards, and the surrounding open, ventilated, light-transmitting orchards are lighter; the orchards have a low incidence from north to south. The incidence of illness is heavy.
3) Control methods.
1 Spray before the grapes germinate. Spraying 3 to 5 degrees lime sulfur or 0.3% sodium pentachlorophenol solution once before germination is of great significance for eradicating overwintering pathogens, reducing initial pathogens, and protecting bud scales.
2 Before and after flowering, spray 50% carbendazim WP 1000 times, or thiophanate-methyl wettable powder 500 ~ 800 times, all have better control effect.
3 To strengthen the cultivation and management, reduce the humidity in orchards, and cultivate disease-resistant varieties can reduce the occurrence of diseases.

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