Effects of Methomyl on Weight and Development of Fall Armyworm (Lepidoptera: Noctuidae)

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Abstract
Twelve-day-old fall armyworm, Spodoptera frugiperda (J. E. Smith), larvae were topically treated with dosages of methomyl representing LD10 to LD62. Survivors showed significantly lower weight gains 9 days after treatment. Methomyl adversely affected weight gain in a wide range of dosages above LD10 for at least 3 days. By pupation, larvae in all treatments weighed the same, but less than did controls. All pupal durations were longer. The number of eggs per female decreased considerably above LD10, as compared with controls, as did the percent viable eggs up to LD50. Egg viability at higher dosages was, however, similar to controls. Only larvae succumbing to methomyl within 3 days showed dosage-dependent weight loss at higher concentrations. Weight loss of larvae dying after 3 days increased significantly and reached a plateau after day 5.

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