Evaluation of Apholate and Tepa as Chemosterilants for the Fall Armyworm123

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Abstract
In evaluating apholate and tepa as chemosterilants for the fall armyworm, Spodoptera frugiperda (J. E. Smith), pupae less than 24 or 48 hr old were exposed to apholate by dipping and to tepa by rotating the insects in the materials dissolved in an aqueous solution and a 10% solution of sucrose, respectively. Resulting adults, numbers of eggs laid, and hatch were all normal when compared with those from untreated pairings. Adults between zero and 96 hr old, continuously fed apholate dissolved in a 1% honey solution during the egg-laying period, were sterilized by 1 and 2 mg/ml. Male and female moths fed for 24 or 48 hr on an apholatehoney solution containing 0.5 and 1 mg/ml of apholate were mated to untreated males or females. Egg hatch was lowered after both treatments but not as much as after continuous feeding of the solution. Egg hatch of moths individually fed 1, 2, or 3 mg of apholate dissolved in 10% sucrose solution was markedly reduced but not completely eliminated. Tepa dissolved in a 10% sucrose solution produced complete sterility in males and females fed 62.5 and 250 μg/moth respectively. Females fed more than 62.5 μg/moth laid fewer eggs than the controls. Females fed 500 μg/ or more did not mate as frequently as those in the untreated control. Males fed 62.5 μg/moth competed effectively with untreated males for untreated females.

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