Seasonal history of the balsam woolly aphid in coastal British Columbia
Keywords:
balsam woolly aphid,Abstract
Studies of the balsam woolly aphid at four locations in south-western British Columbia showed that there were basically two generations per year, although only a partial second generation may occur at high elevations and a partial third generation at low elevations in some years. The initiation of spring development occurred as early as February in the moderate climatic sites and as late as May in the more severe ones. The first crawlers appeared in late April, with initial peak abundance occurring from late May to the first half of July, depending on location. Thereafter crawlers were present during the remainder of the season, even into December at low elevations, with peaks in abundance occurring throughout August, September and October.References
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