Study On The Synergism Of Additives To Fungicides For Controlling Grape Mildew

Grape downy mildew is the most important disease of grape, and chemical control measure is the major control measure. The long-term use of chemical agents is easy to cause the resistance of grape downy mildew fungus to drug resistance. In this study, the mixture of different additives and general fungicide, aimed at reducing fertilizer and pesticide application but increasing theirs efficiency based on China’s strategic needs.【Aim】The optimal complex formulation of additives and fungicide was screened, these study provide theory basis and technological support for controlling grape downy mildew in field.【Methods】In this study, grape downy mildew as the research object, select the control of grape downy mildew commonly used six kinds of agents: dimethomorph, azoxystrobin, cuprous oxide, methane frost ? cymoxanil, mefenoxam · MZ dioxanone ? cymoxanil, four kinds of additives(Glamour female nonionic, Jebsen synergist pure silicone, silicone, agricultural silicone additives), in different proportions can be complex, the complex was determined with agents of downy mildew sporangium germination rate, indoor and field control efficacy, defined the best species for control of grape downy mildew additive agent, the ratio.【Results】1. The inhibition effect of the mixture of different fungicides and additives on the germination of spores was different. The results showed that anionic and nonionic and metalaxyl, cymoxanil, cuprous oxide mixed significantly improve the inhibition on sporangium germination, germination rate was 14.45% and 14.98%respectively. Inhibitory silicone additives and one cymoxanil complex spore germination significantly, the germination rate was 14.06%; Dimethomorph and after silicone additive compound to improve the inhibition of spore germination is relatively clear, the germination rate was 14.50%.Four kinds of additives mixed with MZ mefenoxam and azoxystrobin sporangium germination of downy mildew on grapes has no significant inhibition.2. To determine the best ratio of additives and agents. For four kinds of aid, set up three concentration gradients, respectively, and six kinds of field recommended concentration agent can be complex. The results show that the non-ionic Yin Jiao Yun agricultural synergist dilution of 2500 times, the best control efficacy, efficacy increase of up to 5.69%, dilution Agricultural silicone additive is 5,000 times with each agent compounded the best control effect, increase the efficacy of up to 21.14%.3. Aid in selecting the best and the best concentration basis, the field efficacy trials.Two kinds of aid and 25% azoxystrobin SC1500 times the effect of the best efficacy was 50.46%;Followed by 55% of hymexazol WG, efficacy was 46%; 25%Cream cymoxanil WP, 86.2% cuprous oxide WP 1000 times, 80% dimethomorph water dispersible granules 500 times, 68% mefenoxam MZ water dispersible granules 800 times.【Conclusion】The organic silicon and anion among 4 kinds of additives mixing 6 kinds of fungicide were different degrees to improve control efficacy on grape downy mildew through the above experiments. Silicone compound hymexazol. When cymoxanil sporangia germination rate is lower than the other compound germination rate. Wherein the organic silicon compound dioxanone ? cymoxanil sporangium germination rate lower than other complex germination. Different concentrations of different additive formulations are differences, organic silicon compound 5,000 times 25% azoxystrobin SC1500 times in the field test, the best control effect, improve the efficacy of 5.36%.