The effects of nutrition and density on the production of alate Elatobium abietinum on Sitka spruce

Abstract

Observations over a period of 10 years showed that, in Northeastern Scotland, alatae of E. abietinum regularly appeared in mid-May, the timing being unrelated to aphid density. The peak number of alatae produced was, however, correlated with aphid density. Following an initially high level the proportion of alatae dropped to virtually nil by mid-June… (More)
DOI: 10.1007/BF00399767

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