What is grape powdery mildew control technology?

Grape powdery mildew is a kind of fungal disease which is difficult to treat in recent years. It is easy to suffer from both table grape and wine grape, and it is most likely to harm young organs such as leaves, shoots and fruits of grape. Especially with the increasing area of table grapes, the northern foothills of Shandong, Hebei and Shaanxi in the north of the Yellow River suffered especially seriously, which not only reduced the quality and yield of grapes, but also affected the beauty and taste of grapes. So what is the control technology of grape powdery mildew?

First, clear the garden at the right time

Clear the orchard in time for picking in autumn, thoroughly remove the fallen leaves, diseased branches and diseased fruits in the orchard and spray stone-sulfur mixture; during the growing season, remove the diseased leaves and fruits in time and bring them out of the orchard to destroy them in time; spray stone-sulfur mixture during the flow of grape sap in spring; during the growing season, remove diseased leaves, diseased fruits, diseased slightly, and so on.

Second, strengthen cultivation and management

Apply more organic fertilizer in the field, properly increase the application of phosphorus and potassium fertilizer, strictly control the use of nitrogen fertilizer, improve the disease resistance of trees; scientific use of pruning technology to prevent powdery mildew in the growing period.

III. Scientific use of pesticides for prevention and control

Spraying 3 °5 °Be stone sulfur mixture or 45% crystal stone sulfur mixture 40% 50 times liquid 2 times 3 times before sprouting grape buds can effectively control the initial infection and reduce the disease in the later stage.

In addition, under the condition of high temperature and humidity in June, combined with the above management measures, 1000-fold solution of chlorothalonil or carbendazim was sprayed in time after rain to prevent grape powdery mildew and other diseases. If grape powdery mildew is found, spray 800-1000 times liquid powder rust in time, spray once every 7-10 days, or 0.3% tetramycin 50g + water 70kg to control grape powdery mildew, and spray 2 times for 3 times.

Sulfur preparation is the basic agent to control grape powdery mildew, including stone sulfur mixture, sulfur powder, sulfur gel suspension, etc., all of which have good therapeutic effect on grape powdery mildew. Be sure to stick to spraying protective fungicides, which are used in critical periods before and after flowering, with the advantage of long duration, and can also be used in conjunction with therapeutic agents after the disease of plants. general protective agents include chlorothalonil, agricultural antibiotic 120, Wuyisin, etc., depending on the specific situation, the general interval is 7 to 10 days.

Note: use in strict accordance with the above pesticides and concentrations. Stop spraying rutin 20 days before picking, stop spraying carbendazim and chlorothalonil 10 days before picking, and stop using any pesticides 7 days before picking. Spray the leaves and ears evenly at the same time.

Fourth, strengthen the management of fertilization

Combined with irrigation, 200-300 g of mixed heavy superphosphate and diammonium phosphate were applied to each grape, and urea was prohibited. Fertilization should be far away from the grape mound 30~40cm, buried depth 10~20cm, immediately watering. Spraying potassium dihydrogen phosphate foliar fertilizer can quickly absorb nutrients by trees and improve fertilizer use efficiency and tree nutrition level. Reduce the dry tip of dried grapes, increase the sugar content and chromaticity of grapes, and make grapes ripen earlier.