Influence of the Mode of Administration of Benzylphenols and Benzyl-1, 3 Benzodioxoles-on Screwworm Fertility124

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Abstract
Inhibition of egg hatchability of Cochliomyia hominivorax (Coquerel) induced by topical treatments with the chemosterilants 2,4-bis(1, 1-dimethylethyl)-6-(phenylmethyl)phenol (A 13-29183); 2,4-bis(1,1-dimethylethyl)-6-(4-methoxyphenylmethyl) phenol (A13-70691); 2,4-bis(1,1-dimethylethyl)-6-(1-phenylethyl)phenol (A13-70736); 5-ethoxy-6-(4-methoxyphenylmethyl)-1,3-benzodioxole (A13-53024); and 5-(2-propenyl)-6-(4-methoxyphenylmethyl)-1,3-benzodioxole (A13-70714) was dose related. The benzylphenol A13-70691 was the most efficient compound tested in inhibiting egg hatchability and was >55 times more potent than the benzodioxoles A13-53024 and A13-70714. A13-29183 and A13-70691 also were effective via tarsal treatments, and their potency was greater in the more mature insects. Treatments via the larval rearing medium, although permitting pupation, prevented eclosion from the pupa only at the highest levels assessed (200 ppm) of A13-70714 and A13-53024. Treatments with all other compounds permitted emergence of adults, but egg hatchability was reduced in the following generation proportional to dosage levels.

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