Disease control of grape in rainy season

First, to give priority to prevention, timely spraying this concept, the general fruit growers understand, but in the actual operation, often not in place, or watching the rain, or busy with other work, delayed the best time for spraying, grapes are most susceptible to disease. Drugs with a residual period of 17 to 21 days should be sprayed every 15 days. If it rains in the middle, depending on the rainfall, shorten the next spraying days as appropriate. If there is heavy rain after spraying, it will be sprayed again after it clears up. If the two adjacent drugs are alkaline or acidic respectively, pay strict attention to the interval time to prevent the neutralization of the two kinds of acid and alkali. Do not delay spraying time. Second, see the onset of the disease, timely treatment of continuous rain, high temperature and humidity, the most susceptible to the disease, to a comprehensive observation in the vineyard once a day. See the onset of the disease, that is, symptomatic spray. For example, downy mildew occurs to varying degrees almost every year, and the frequent season is about 10 days before "the Beginning of Autumn". When the temperature difference between day and night is more than 10 ℃, it is the most susceptible to the disease. See a few places in the garden, even if downy mildew is found on a grape, spray it. The commonly used drugs are 70% Cobo 600-fold solution, 80% ethylphosphates 300-fold solution, or 1 Porto 0.70% Bordeaux solution. Third, mainly Bordeaux liquid, suitable for many years of experience and reaction of some fruit growers. Bordeaux liquid is an economical and safe medicine for disease prevention, and its exertion is relatively strong. In the process of grape disease prevention, Bordeaux solution as the main line, suitable for other drugs, the disease control effect is very good. It can be sprayed before flowering with 1-0. 5-0. 5-240-fold liquid, after flowering with 1-0. 7-220-fold spray, during the grape expansion period with 1 0. 7-200 fold spray, after grape harvest with 1-1-1-fold 1-fold spray, and in autumn with 1-2 times. If the occurrence of white rot, anthrax and other diseases, then symptomatic spray. Most of these drugs are acidic and have a strictly limited interval with Bordeaux liquid. Fourth, the appropriate amount of fertilizer, in order to strengthen the tree potential and improve the resistance in rainy season, will cause the loss of fertility, weaken the tree potential and reduce the resistance. Therefore, in the rainy season, the appropriate amount of fertilizer should be added according to the loss of soil fertility and the growth of grapes, with the method of "eating less and eating more". Especially heavy sandy loam land. To pursue fertilizer outside the root is to get twice the result with half the effort. Generally combined with spraying, especially needed, sprayed separately. When spraying Bordeaux solution, add 0.5% urea. When spraying acidic drugs, 0.5% urea and 0.3% potassium dihydrogen phosphate can also be sprayed with foliar fertilizer of reliable quality. But the new fertilizer must be tried first and then used on a large scale. Fifth, loosen the soil in time and increase soil permeability in rainy seasons, especially after heavy rain and torrential rain, the surface of the vineyard will be hardened, the soil will be poorly ventilated, the grape roots will be anoxic, the tree potential will be weakened, the resistance will be reduced, and it is easy to get sick. Therefore, the soil should be ploughed once deeper before the flood season. In the rainy season, we should pay close attention to the interval between rainy days and plough the vineyard to increase the permeability of the soil. Sixth, clean the secondary tip to facilitate ventilation, light and rainy season, the grape is the most easy to grow, and the incidence of secondary shoot is very high. It is necessary to pick the heart of the grapes and wipe off the secondary tips in time. At the same time, for the plants with too many new shoots, some of them should be removed as appropriate, which is beneficial to ventilation and light transmission and improve stress resistance. Seventh, timely clearing the garden to curb the spread of the disease if there is a disease in the vineyard, there is more rain, more water, high temperature and humidity, and the source of the disease is the most likely to spread. Therefore, the garden should be cleared at any time. Remove the diseased leaves, branches and fruits from the garden, bury them or burn them. At the same time, timely removal of weeds in the garden, in cutting off diseased branches, diseased fruit, should often wash scissors, and disinfection, to prevent cross-infection.