Downy mildew is a common disease on rapeseed, which occurs during the whole growth period of rapeseed, causing the leaves to die, the inflorescences are fat and deformed, and they are not strong or strong. The disease is caused by downy mildew infection, and the rapeseed is prone to develop in the weather of low temperature and rain or cold and cold. In order to screen out high-efficiency pesticides , six pesticides were selected for field trials.
The test reagents were 72% nail cream, manganese zinc wettable powder, 30% dimethomorph wettable powder, 80% dimethomorph wettable powder, 77% copper hydroxide wettable powder, 25%. A cream · downy mildew WP and 75% chlorothalonil wettable powder. In the flowering stage of rapeseed, the corresponding concentration spray was diluted, and the disease index of each treatment was investigated before and 7 days, 14 days and 21 days after the drug, and the corresponding corrective effect was calculated.
The pesticide network understands that the above six pesticides have certain control effects against rape downy mildew. 7 days after the drug, the 80% dimethomorph wettable powder 2500 times solution has the highest corrected control effect, which is 51.93%, which is significantly higher than 30% dimethomorph WP 800 times solution and 25% nail cream and cream. The control effect of the mildew wettable powder 500 times liquid treatment is extremely higher than that of the treatment of 72% of the nail cream and manganese zinc wettable powder 600 times liquid; the treatment of 72% nail cream and manganese zinc wettable powder 600 times liquid The correct correction effect is the lowest, which is 32.21%. 14 days after the drug, 72% of the nail cream·manganese-zinc WP 600 times solution has the highest correction effect, which is 32.21%, which is significantly higher than the 77% copper hydroxide wettable powder 800 times solution. The difference was not significant with other treatments; the 80% dimethomorph wettable powder 2500 times solution was the next, which was 46.28%. 21 days after the drug, 72% of the nail cream·manganese-zinc wettable powder 600 times solution has the highest corrected control effect, which is 62.17%, which is significantly higher than the 77% copper hydroxide wettable powder 800 times solution, but with The difference of other treatments was not significant; 80% dimethomorph wettable powder 2500 times solution was the next, which was 46.28%.
The test results show that 72% of the cream and manganese-zinc wettable powder have high control effect and long duration, but the quick-acting effect is poor. When the downy mildew of rapeseed occurs rapidly, it may not be conducive to controlling the disease in a short time. The corrective effect of the 77% copper hydroxide WP that can be killed in the 14th and 21st days after the drug is the lowest, indicating that the effect of controlling the downy mildew of rapeseed is not good. The 80% dimethomorph wettable powder achieved 51.93% control effect 7 days after administration, which was the quickest in the 6 kinds of agents, and maintained 52.72% of the control effect 21 days after the drug, indicating that it The effect of the drug lasts longer. At 7 days, 14 days and 21 days after the drug, the corrective effects of the 75% fungicide chlorothalonil WP were 39.21%, 41.11% and 49.46%, respectively, and the control effect was general. According to the comprehensive analysis, 80% dimethomorph wettable powder has good quick-acting effect on the control of rapeseed downy mildew, and it has a long duration and can be widely applied in production.
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