用印度楝子抽水剂喷洒植物叶片，可阻止真菌孢子引起的病害，如粉霉病和腐烂病。在植物生长期间，每隔7～14天喷洒1次，可使植物不受这类病害危害；在已受粉霉病危害的植物上，楝子油的防效与三种杀菌剂单用的防效相当。特别是在紫阳花、丁香花等花卉上，仅喷洒1次就可有效地保 Spraying plant leaves with a neem extract can prevent fungal spore-induced diseases such as powdery mildew and rot. Spraying plants once every 7 to 14 days during plant growth can protect plants from the hazards of these diseases. In plants that have been affected by powdery mildew, the control effect of the neem seed oil and the three fungicides used alone Effectiveness. Especially in hydrangeas, flowers such as lilac flower, spray only 1 time can effectively protect