See the Natural Repellents in Yardener's Tool Shed. Neem oil soap is a natural insecticide that will kill scale on contact and then repel new arrivals for about 2 weeks. Pyrethrum is made from chrysanthemum blossoms and is quite effective especially when applied directly to the pest.

Does pyrethrin kill scale?

There are several well-known remedies that can be tried in an attempt to eliminate scales from a houseplant. ... Aerosol or hand pump insecticide sprays made just for houseplants are available at garden centers. Formulated active ingredients include insecticidal soaps, pyrethrin, rotenone, resmethrin and acephate.

What insecticide kills scale?

When the scale feed on the sap, they ingest the toxic insecticide and are killed. Acephate, imidacloprid and dinotefuran are three commonly used systemic insecticides that are effective against scale.