Local and long-range movement of adult western corn rootworm (Coleoptera: Chrysomelidae) as evidenced by washup along southern Lake Michigan shores.
Grant R.H. | Seevers K.P.
During the months of July through early September from 1984 through 1986, large numbers of live, predominantly female, western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte, adults appeared on the southern shoreline of Lake Michigan on 16 occasions. Correlation of the numbers of beetles washed ashore with the passage of synoptic scale weather systems shows that the beetles accumulate on the shoreline after the passage of cold fronts starting at approximately the date of maximum emergence of WCR and continuing for 24-49 d. The WCR deposited on the shoreline appear to have originated from fields local and distant from the shoreline, with local WCR predominant in deposition events near the time of local maximum emergence and long-distance WCR predominant in deposition events later in the season. Insects appear to be carried along the front. Precipitation does not appear to result in greater deposition of WCR onto the surface, therefore descent of the insect must be by active flight or downdrafts in the front.
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