Reference standards of imidacloprid (purity, 98%), thiamethoxam (purity, 95%), acetamiprid (purity, 95%), fenpropathrin (purity, 98.5%), chlorpyrifos (purity, 98%), carbendazim (purity, 95%), prochloraz (purity, 98%) and pyrimethanil (purity, 95%) were obtained from Dr. Ehrenstorfer GmbH (Augsburg, Germany).
Formulated pesticides of imidacloprid 10% wettable powder (WP), thiamethoxam 25% water-dispersible granules (WDG), acetamiprid 20% WP, fenpropathrin 20% emulsifiable concentrate (EC), chlorpyrifos 40% EC, carbendazim 80% WP, prochloraz 25% EC, and pyrimethanil 40% suspension concentrate (SC) were purchased from the agricultural market located in Hefei, Anhui, China.