1 month. Ethazole fenfenil has good quick-acting effect and long-lasting effect. The mites begin to die 1 day after application, and the mortality rate of mites can reach more than 98% in 3 days. 30 suspensions of 2000 times liquid can effectively control hawthorn spider mites after 14 days. The efficacy is 96.1. It takes 1 month after spraying before picking the fruits.