Abstract
Ten yellowjacket species, of markedly different abundances, were found in a central Appalachian broadleaf forest from 1991 to 1993. Malaise-trap samples indicated that yellowjacket numbers fluctuated greatly between years, as occurs in other habitats. A split-plot analysis revealed that diflubenzuron decreased worker number in the application year but not in the postapplication year and revealed no effect of trap site on worker sample size.
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