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Observations on the flight periods of aphids in a Sitka spruce plantation in north-eastern Scotland

Published online by Cambridge University Press:  10 July 2009

W. H. Parry
W. H. Parry
Affiliation:
University of Aberdeen, Department of Forestry, St. Machar Drive, Old Aberdeen AB9 2UU, Scotland
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Extract

Flight activity of aphids during 1969–71 in a Sitka spruce plantation in north-eastern Scotland was recorded by means of sticky traps. Two flight periods occurred, June–August and September–October. Fewer aphids were caught at 120 and 180 cm than at 60 cm above ground during June–August, while fewer were caught at 60 cm in September–October. After accounting for differences in wind speed at these heights, it was shown that aerial density was consistently higher at 60 cm. The first flight which comprised mostly Elatobium abietinum (Wlk.) was three weeks early in 1971; this was associated with the rapid increase in aphid population on spruce shoots, due to the preceding mild winter. Reinfestation by this species after spraying could follow under similar circumstances. Adelges laricis Vail. and A. viridis (Ratz.) sexuparae were caught in the first flight, and A. cooleyi (Gill.) gallicolae in the second; all galls on Sitka were by gallicolae of A. cooleyi. Aphis fabae Scop, was the most common species in the second flight.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 62 , Issue 3 , February 1973 , pp. 391 - 399
Copyright
Copyright © Cambridge University Press 1973

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