Early Germ Feeding and Larval Development of the Angoumois Grain Moth1

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Abstract
The average length of the larval-pupal periods of 132 Angoumois grain moths. Sitotroga cerealella (Olivier), reared in degermed wheat kernels was 45.2 days, which was 19.3% longer than the 37.9-day average of 144 moths reared in whole kernels. Females from degermed kernels weighed less. An average larval-pupal period of 48.5 days for 45 moths reared in brush half-kernels of wheat was 16.3% longer than the 41.7 days for 44 insects reared in germ hall-kernels. Both the males and females from brush half-kernels weighed less. Apparently, differential feeding on various other parts of the wheat kernel influenced the length of the larval-pupal period. Numbers of larval instars varied from 4 to 7. Instar were determined by dissecting kernels of various types from which moths had emerged, to recover the cast larval mandibles. More instars were associated with longer larval-pupal periods.

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