What evidence is there that the pesticide killed aphids?

Evidence that a pesticide has killed aphids can include a significant reduction in aphid populations observed through counts before and after pesticide application. Additionally, symptoms of aphid mortality, such as the presence of dead aphids or their absence from treated plants, can be documented. Laboratory tests showing the pesticide's efficacy against aphids, along with field trials demonstrating improved plant health and yield, also support the conclusion that the pesticide was effective in controlling aphid populations.