Observations on Eriocampa ovata L. (Hymenoptera: Tenthredinidae) infesting red alder in southwestern British Columbia

As in Quebec, <i>Eriocampa ovata</i> L. in British Columbia is bivoltine, parthenogenetic and overwinters as a prepupa. Unlike <i>E. ovata</i> in Quebec, the first instar larvae emerge on the lower side of the leaf, and pass through 6 or 7 rather than 5 or 6 larval instars. Defoliation characteristically leaves only the midrib and main secondary veins. In limited areas, small trees may be completely defoliated