The hot weather in summer provided conditions for the development of grape powdery mildew. Generally, the period from July to August was the peak of onset, and the incidence was fastest, and the epidemic was caused by the influence of high-temperature and high-humidity environment. How to do a good job in this phase of prevention and control is related to the improvement of the overall quality and yield of fruit. Senior agronomist He Tongling recommends that the majority of farmers should strictly monitor the disease and deal with it once it is found.
Grape powdery mildew is most likely to invade all the green parts of the young tissue of the plant, generally producing irregular patches of faded green or yellow patches on the leaves, and a layer of white powdery material can be seen on both sides of the lesion. He Tongling said that the disease infection gradually caused the leaves to curl and wither and even fall off, making the fruit stems brittle, and the growth of shoots blocked. "Grape powdery mildew is in the mid to late June to late July. The cultivation of grapes is the most susceptible to the occurrence and prevalence of powdery mildew, mainly due to drought, over-cultivation, excessive nitrogen fertilization, and failure to trim the branches. He Tongling said.
The scientific prevention of grapevine powdery mildew is critical to the production of fruit trees before production. He Tongling suggested that thorough clean-up of the health of the field should be carried out to maximize the destruction of the environment required for the disease to spread, and the damaged leaves, branches, and diseased fruits should be trimmed in time. Stem, can not be left under the pruned leaves in the field, must be brought outside the field for centralized treatment. At the same time, it is necessary to timely pluck the vines, cut the auxiliary tip, thin the flowers, thin the fruit, and keep the fields airy and transparent. In addition, to control the amount of nitrogen fertilizer application, timely re-application of phosphorus, potassium fertilizer, thereby enhancing plant disease resistance.
On the basis of good agricultural control, we should pay attention to drug prevention and control. He Tongling said that sulfur preparations are basic pharmaceutical agents for the prevention and control of grape powdery mildew, including lime sulfur, sulfur powder, and sulfur rubber suspensions, all of which are good for grape powdery mildew. treatment effect. “Spray-protective fungicides must be adhered to. This agent is used in the critical period before and after flowering, has the advantage of long duration, it can also be used in conjunction with therapeutic agents after the onset of plants, general protective agents. Including chlorothalonil, agricultural anti-120, Wuyi bacteria, etc., depending on the number of medications depending on the specific circumstances, the general interval of 7 to 10 days to spray once." He Tongling said.
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