Downy mildew is a multiple disease of grapes, which mainly damages the leaves and often causes large numbers of leaves. The disease can also infect young tissues such as young shoots, inflorescences, and young fruits. The pathogenesis of light disease is stagnant, and the disease is abnormal; in severe cases, the diseased shoots die and the ears fall off, which not only causes the production to decrease in the same year, but also because the shoots are poorly developed and susceptible to freezing damage, and the annual output will also be affected. In order to screen out the biological pesticides that effectively control the grape downy mildew, Si Shuding and others of the Plant Protection Institute of Yantai Academy of Agricultural Sciences in Shandong Province tried five kinds of sterilizations such as Baitai (60% pyraclostrobin and Daisen water dispersible granules). The agent was tested in the field.
The experiment was carried out in a vineyard where the downy mildew occurred. Five pesticides were used to solve the problem. They were Baitai 1500 times liquid, Pinrun (70% Daisen joint dry suspension) 700 times liquid, Kairun (25% pyrazole). Epoxyl ester emulsifiable concentrate) 3000 times liquid, kelu (72% cream urea·manganese zinc wettable powder) 700 times liquid and 80% ethyl phosphine aluminum wettable powder 500 times liquid, once every 10 days, continue to prevent and cure 3 times . Take clear water as a control.
According to the experimental investigation, the disease leaf rate and disease index of grape downy mildew in the Qingshui control area continued to grow, the back of the leaves was covered with mildew, and the leaves were dried or even shed. The grapes with the above five fungicides were better. control. Seven days after the second drug, the pesticide network learned that the best control effect of Kairun was 93.83%, which was obviously better than the other drugs. After 10 days of the third drug, the solution was solved. Above 81.26%, the control effects of Kairun and Baitai are 98.15% and 97.38%, respectively, which is obviously better than Kelu and Ethylphosphine Aluminum.
The experimental results show that Baitai and Kairun have good control effect against grape downy mildew. The protective effect of Kelu and ethylphosphine aluminum is lower than that of Baitai and Kairun, but it also reaches over 88%. The agent can be used as an effective medicament for controlling grape downy mildew. The control effect of Pinrun is only 81.26%. It is not suitable for the main agent for controlling grape downy mildew, but it can assist the other fungicides as protective fungicides before the occurrence of downy mildew. Finally, the China Pesticide Network suggests that the prevention and control of grape downy mildew in production should be controlled before or during the occurrence of the disease, and should be controlled again and again according to the climatic conditions and the degree of disease development for about 10 days, usually 2-3 times. In order to avoid the resistance of single drug bacteria, it is advisable to rotate a variety of fungicides .
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