[Aims]Different formulas of cyetpyrafen·spirotetramat 20％ suspension concentrate(SC)were prepared to investigate the spray drying volatilization properties and the efficacy of the formulation.[Methods]Using an agrochemical formulation preparation and screening system,different formulation samples were prepared and particle size of them was measured to characterize their dynamic drying volatilization process.The efficacy tests in laboratory of the formulation samples against red spider mite were conducted to investigate the variations in drying volatilization properties and their impact on efficacy.[Results]The cyetpyrafen·spirotetramat 20％ SC with formulation Ll-11 exhibited a D50 of 230 nm and a volatile mDE t90 of 9 minutes.This formulation showed the highest efficacy against the red spider mite,with an LC50 value of 0.7270 mg/L.[Conclusions]By preparing different formulation systems and conducting comparative studies on the particle size,drying volatilization and spray droplet performance of the liquid,the corresponding relationship between the spray drying volatilization properties and efficacy of the cyetpyrafen·spirotetramat 20％ SC was preliminarily explored,and a formulation that exhibit significantly superior efficacy compared to the mixture of technical materials was obtained.
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