Properly manage the yield of grape and improve the management of newly planted grape in August

The newly planted grape has developed from the growing stage to the budding stage by August. during this period, strengthening the prevention and control of grape downy mildew and increasing the application of phosphorus and potassium fertilizer are particularly important to increase grape yield. if the prevention of downy mildew and the application of phosphorus and potassium fertilizer are ignored, there will be a large area of diseases, resulting in the loss of photosynthesis and metabolic function of grape leaves. The lack of phosphorus and potassium fertilizer affects the ripening of new shoots and flower bud differentiation of grape. therefore, according to the growth characteristics of grape, the key points of management of newly planted grape in August are put forward for reference only.

Grape management

1. Prevention and control of downy mildew

Grape downy mildew, common diseases, frequently-occurring diseases, especially in high rainfall, high humidity, high temperature weather, the incidence is high. In the process of grape planting in the first year, downy mildew is the most harmful to young trees. Prevention and control methods:

(1) strengthen the management of orchard. In late autumn, diseased leaves were collected, diseased tips were cut off, burned or buried deeply. Attention should be paid to drainage, pruning and sprouting, and hedges should be raised above 60cm, and unnecessary branches too close to the ground should be rewarded as far as possible to reduce ground humidity and disease incidence. The vigorous growth of grape varieties should be scaffolding, or "high, wide, vertical" shaping to ease the growth of branches and improve ventilation and light transmission conditions.

(2) spraying prevention and treatment. Spraying 750 times 50% Ruidui wettable powder once in 20-30 days, or 40% Mengjing wettable powder 300 times every 15 days or so has an excellent effect on the prevention and control of grape downy mildew. In addition, Bordeaux solution has a good effect on the control of downy mildew. It can also be protected by Bordeaux liquid in the early stage, in addition, it can be sprayed with 500 times of 50% thiram wettable powder, 500 times of 64% germicidal alum wettable powder, or 58% Ruidui manganese zinc wettable powder, all of which have good results.

2. Increase the application of phosphorus and potassium fertilizer

After August, we should control nitrogen fertilizer, increase phosphorus and potassium fertilizer, promote the ripening of branches and leaves, improve grape disease resistance, and lay the foundation for the production of the second year. In addition to topdressing and fertilization, we should also use the method of extra-root topdressing to supplement various nutrients.