Grape Rainy Season Management
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Grape Rainy Season Management
Although summer temperatures are high, it also brings heavy rainfall. Recently, many reports indicate that the south will experience a new round of consecutive heavy rainfall. Farmers should be prepared for prevention and control in a timely manner, as diseases are easily triggered after the rainy season.
Prevention first, spray in time, prevent and treat diseases.
Implement the prevention policy of "prevention first, prevention is better than treatment," focusing on prevention and using treatment as a supplement. Do not take preventive measures in advance, and take emergency medication promptly after onset. For drugs with a residual period of 17-21 days, generally spray every 15 days. If there is rainfall in between, the next spray interval should be shortened based on the rainfall situation. If heavy rain occurs after spraying, reapply after the weather clears. If two consecutive drugs are alkaline or acidic, pay strict attention to the interval to prevent acid-base neutralization. Treat promptly at the first sign of disease. Observe the vineyard once a day. At the early stage of the disease, spray the medicine immediately.
For example, downy mildew occurs every year to varying degrees. The most frequent season is from the end of July to early August. Downy mildew is most susceptible when the day-night temperature difference is greater than 10°C. At this time, observe carefully, and if downy mildew is found on a single grape, spray the entire vineyard immediately. Common drugs include 70% cobalt 600 times solution, 80% aluminum phosphide 300 times solution, or 1:0.7:180 Bordeaux mixture. It is recommended to use Bordeaux mixture as the main reagent, with appropriate use of other reagents. Also, pay attention to the alternating use of pesticides to prevent resistance and improve control effectiveness.
Increase fertilization to enhance tree robustness and improve stress resistance.
In the rainy season, fertility loss can weaken tree vitality and reduce stress resistance. Therefore, based on soil fertility and the loss of grape growth, adopt a "less eating, more meals" approach to appropriately increase fertilization, especially in heavy sandy loam areas.
Foliar application can achieve twice the result with half the effort. It is usually combined with spraying, especially when needed, apply separately. The method is to add a 0.5% urea solution when spraying Bordeaux mixture. When spraying acid, add 0.5% urea and 0.3% potassium dihydrogen phosphate. Reliable foliar fertilizers can also be sprayed, but new fertilizers must be tested before large-scale application.
Loosen soil in time to increase soil permeability.
In the rainy season, especially after heavy rain or暴雨, the surface of the vineyard hardens, soil permeability is poor, grape roots are hypoxic, tree vigor is weakened, stress resistance is reduced, and grapes are prone to diseases. Therefore, deep tillage should be performed on the soil before the flood season. During the rainy season, pay close attention to the gaps between rainy days to plant the vineyard and increase soil permeability.
Clean auxiliary tips to facilitate ventilation and light transmission.
In the rainy season, grapes are most likely to overgrow, and the incidence of lateral branches is high. Harvest the grape hearts and wipe off the side tips in time. Also, for plants with too many new buds, remove some new buds appropriately to facilitate ventilation and light transmission, improving stress resistance.
Clear the garden in time to prevent disease transmission.
In the rainy season, there is more rain, moisture, high temperature, and humidity, so disease sources are easily transmitted. If a disease occurs in the vineyard, clean the vineyard at any time and remove infected leaves, branches, and fruits from the vineyard for burial or incineration. Also, remove weeds in the garden promptly. When pruning diseased branches and fruits,剪子 should be frequently cleaned and disinfected to prevent cross-infection.
In summary, grape-growers should be well-informed and take preventive measures in advance to avoid irreversible losses caused by the rainy season.
The above sharing of specific introduction to grape rainy season management is for netizens' reference.