Tomato early blight seriously affects the quality and yield of tomato, and timely pesticide control to reduce losses. The China Pesticide Network Xiaobian reminds everyone that it is the last word to choose pesticides. The following are suitable agents for tomato early blight:
Mancozeb wettable powder is a protective fungicide and has good control effect on common diseases of vegetables. In order to clarify its control effect on tomato early blight, we conducted a drug efficacy test, and the results are summarized as follows:
The test agent is 80% mancozeb wettable powder; the control agent is 70% mancozeb wettable powder, and the control object is tomato early blight in greenhouse. The experiment consisted of 5 treatments, 4 repetitions, and 20 plots, randomly arranged. Spray once every 7 days, and the amount of liquid used in each plot is 60 kg/mu. The disease base was investigated before the first application, and the control effect was investigated 7 days after the third application. The method is to randomly sample five plots per plot, 5 strains per point, and investigate 10 leaves per plant, upper, middle and lower, and classify the area of ​​the lesion on each leaf of each plant as a percentage of the total leaf area, according to the grading standard. Record the number of diseased leaves at all levels, calculate the disease index and control effect.
The results showed that the effect of 80% mancozeb wettable powder 600, 800, 1000 times liquid on 7 days after application of tomato early blight was 86.69%, 85.28%, 76.13%. The effect of controlling 70% mancozeb WP 500 times against tomato early blight was 84.44%. It can be seen that the control effect of 80% mancozeb wettable powder on the prevention and treatment of tomato early blight 800 times liquid is similar to that of 70% mancozeb wettable powder 500 times liquid; the control effect of 600 times liquid is obviously 70 % Daisen Mn-Zn wettable powder 500 times liquid control effect, the variance of each treatment was significant. Pesticide network suggested that 80% mancozeb wettable powder 600, 800 times liquid is effective in controlling tomato early blight, and it can be applied once every 7 days in the early stage of tomato early blight, which can effectively control the damage of tomato early blight.
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