Abstract
F. externa Ferris on hemlock in Maryland has 2 generations per year. Crawlers hatch continuously from late April until early November. The largest egg hatch is in early May when the new growth is approximately ½ inch long. The second largest hatch occurs in September. There is a great deal of overlapping of the generations especially during the second generation. From 91 to 96 days are required for first-generation development. Second-generation development was longer because of cold and other unfavorable environmental conditions.
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