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How do you treat insects with waxy hard shells on the leaves of coral ardisia (Ardisia crenata)?
This is an infestation by scale insects. The main control measure should be chemical treatment; you can use specific insecticides such as methidathion, chlorpyrifos, Guoguang Jie Bisi, etc., which are highly effective, as ordinary insecticides struggle to penetrate their waxy layer to take effect. If the infestation is heavy, spray 2 times to completely eliminate them. You can also scrape or brush them off manually.