Adult Emergence, Ovarian Development, and Oviposition Sequence of the Western Corn Root worm in Nebraska12

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Abstract
Age and ovarian development of female Diabrotica virgifera LeConte were found to be correlated. By using a scale similar to that of other investigators, stage I ovaries (without oÖcytes in the vitelarium) were found in all beetlcs up to 4 days of age. Beetles with stage 3.5 and 4 maries (each with chorionic eggs) were considered gravid, and these began appearing in females averaging 13 and 18 days of age, respectively. Beetles in the laboratory began ovipositing on an average when they were 21 days old. Ovarian development in field-collected beetles was used to determine the female emergence pattern and the appearance and abundance of gravid females in corn root worm populations for 3 separate areas in Nebraska. Soil samples from the same areas showed egg recovery increased materially the week following maximum abundance of gravid females in the field. There is a period when female beetle emergence is essentially complete and before many eggs are laid when chemical treatments directed at the adults should curtail effectively egg deposition.

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