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Cottonseed oil and safer insecticidal soap effects on cotton and vegetable pests and phytotoxicity

Cottonseed oil and safer insecticidal soap effects on cotton and vegetable pests and phytotoxicity

Southwestern Entomologist 15(3): 257-264

Cottonseed oil (Natur'l Oil, Stoller Chemical Co., Houston, TX), raw cottonseed oil and Safer Insecticidal Soap (Safter Inc., Wellesley, MA) were evaluated for insecticidal activity to: (1) aphids, Myzus persicae (Sulzer) on cotton, Gossypium hirsutum (L.), and an eggplant, Solanum melongena L. and to Brevicoryne brassicae (L.) on collards, Brassica oleracea DC, var. Acephala; (2) thrips, Frankleniella spp. on cotton; and (3) beet armyworm, Spodoptera exigua (Hubner) on swiss chard, Beta vulgaris subsp. cicla (L.) Koch. Cottonseed oil was also evaluated for acaricidal activity to spider mites, Tetranychus spp. on celery, Apium graveoleus L. var. Dule (Miller). Phytotoxicity ratings were made on all experimental plants as well as when cottonseed oil (Natur'l Oil) was applied with a micropipette to the youngest growing leaves of lettuce, Lactuca sativa L., plants. Cottonseed oil induced high levels of mortality on all pest species on all the host plants studied. Safer Insecticidal Soap was less effective. Cottonseed oil killed eggs of beet armyworm on contact, and high levels of beet armyworm larval mortality occurred on cottonseed oil-treated residues on swiss chard leaves. Raw cottonseed oil was phytotoxic to collard plants. Rates of cottonseed oil (Natur'l Oil) of 10% or higher placed in the crown of lettuce plants caused burning and distortion of the youngest growing leaves.

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