To investigate the effects of tank-mixing a self-developed pesticide adjuvant "Yafeng" with chemical pesticides on pesticide utilization rate and field control efficacy against rapeseed Sclerotinia stem rot(Sclerotinia sclerotiorum) and wheat Fusarium head blight(Fusarium graminearum), in this study, using the commercial mainstream adjuvants(Beidatong and Uban) as controls, a combined approach of laboratory assays and field trials was employed. Yafeng's regulatory effects on the physicochemical properties of the pesticide solutions such as 40% of prothioconazole·tebuconazole and Xiatian(200 g/L of Fluxapyroxad suspension concentrate+25% of prochloraz emulsion), and the control efficacy in field in Hexian and Lujiang of Anhui province were analyzed. The results showed that Yafeng significantly optimized pesticide solution performance, its 100 to 2 000-fold dilution could significantly shorten the wetting time and reduce the surface tension of 40% of prothioconazole·tebuconazole suspension concentrate and Xiatian pesticide solutions, with effects superior to those of the commercial adjuvants and the pesticide blank group. Field trials confirmed Yafeng's remarkable pesticide-reducing and efficacy-enhancing effects, for rapeseed Sclerotinia stem rot control, Xiatian with a 20% of dosage reduction and 95.83% of efficacy achieved, adding Yafeng increased pesticide deposition utilization rate by 15.68% and 13.45% , and control efficacy by 15.96% and 5.44% in the two test sites, respectively. For wheat Fusarium head blight control, 40% of prothioconazole·tebuconazole suspension concentrate with a 25% of dosage reduction with Yafeng reached 84.82% of efficacy, adding Yafeng in 40% of prothioconazole·tebuconazole and 275 g/L of fluxapyroxad·propiconazole suspension concentrate increased deposition utilization rate by 16.53% and 20.73%, respectively. In summary, Yafeng significantly improved pesticide deposition utilization rate and field control efficacy by optimizing the wetting performance of pesticide solutions and reducing surface tension, achieving pesticide reduction and efficacy enhancement.
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