Synthetic Pyrethroids

Marijuana Horticulture

by Jorge Cervantes

Ingredients – Synthetic pyrethroids such as permethrin and cypermethrin act as broad-spectrum, nonselective contact insecticides and miticides. There are more than 30 synthetic pyrenthroids available in different formulations. Deltamethrin is available in different formulations. Deltamethrin is available as a sticky paint that is used as a trap when applied to stems and colored objects. Other pyrethroids include Allethrin, cyflutrin, fenprpathin, phenothrin, sumithrin, resmitherin, and telfuthrin.

Controls – Aphids, whiteflies, thrips, beetles, cockroaches, caterpillars, and spider mites. Many insects and mites are resistant to pyrethroids.

Caution – Nonselective pyrethroids kill all insects and mites including beneficials and bees.

Mixing – Follow directions on container.

Application – Follow directions on container.

Persistence – Breaks down in one to three days. Newer pyrethroids, such as Permethrin, stay active the longest.

Forms – Powder, liquid, aerosol.

Toxicity – Toxic to all insects. It is somewhat toxic to mammals.

Safety – Wear a mask and protective clothing when applying sprays or breathing in any form of pyrethrum, especially aerosols. Aerosols contain toxic PBO and MGK 4646 – possible carcinogens – which are easily inhaled.