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As a new generation of agricultural adjuvant, organsilicone adjuvant has been widely used in agricultural production.Silwet408 is a trisiloxane ethoxylate modified non-ionic surfactant, and it has excellent surface activity in water; downy mildew is one of the main hazards in pepper.In this paper, the synergism of Silwet408 to Azoxystrobin control on pepper downy mildew has been studied, and the results show that the effect of 25% Azoxystrobin SC added 5 ml Silwet408 per 15kg water is better than Amistar.