How to control grape downy mildew with foggy continuous overcast and rainy grape diseases
The main diseases in grape growing period include downy mildew. The occurrence and prevalence of downy mildew is closely related to climatic conditions, and it is most likely to occur in foggy, dewy or continuous rainy days in late spring and early summer or autumn. At the same time, the vineyard is low-lying, plants, branches and leaves are too dense, scaffolding is too low, poor ventilation and light transmission can also lead to the disease. Grape downy mildew spreads quickly, harms grape leaves, causing leaves to dry up and fall off, seriously reducing yield by 2040%, or even no harvest. The prevention and control techniques of grape downy mildew are as follows:
Grape downy mildew
1. Clear the source of the disease. In autumn, clean the vineyard, remove the diseased branches and leaves, and dig the soil deeply.
2. Fertilize scientifically and strengthen management. During the growing period of grapes, avoid partial application of nitrogen fertilizer, increase application of phosphorus and potassium fertilizer and mature organic fertilizer to improve disease resistance; timely pruning and reasonable pruning to prevent excessive density of branches and leaves; properly strengthen the ventilation and light transmission of the vineyard and reduce the humidity in the vineyard; timely and appropriate irrigation, pay attention to drainage after rain to reduce ground humidity and reduce the chance of pathogen infection.
3. Drug prevention and treatment. Before the onset of the disease, spray 1-0. 5-0.7-fold Bordeaux liquid to prevent, seize the critical period before the infection of the bacteria, spray the first time, and then spray once every half a month, spray 3 times 4 times, the preventive effect number; after the disease. Timely spraying 65% Dysen zinc wettable powder 500 times or 40% ethyl phosphorus aluminum wettable powder 300 times, spraying once every 7 days and 2 times in succession, has a good therapeutic effect on grape downy mildew.
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