Cornicle length as a criterion for separating field-collected nymphal instars of the pea aphid, acyrthosiphon pisum (homoptera: Aphididae)

William D. Hutchison, David B. Hogg

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Cornicle length measuremetns of Acyrthosiphon pisum (Harris) nymphs reared in the laboratory were instar-specific and unaffected by rearing temperature. A multimodal analysis of cornicle lengths of field-collected aphids clearly detected four distribution peaks (i.e., instars) in five different field populations, and there was generaaly little overlap between successive in star distributions. However, third and fourth instars in the spring field sample could not be separated accurately due to the shorter cornicle length of nymphs that developed from overwintered eggs. Cornicle length proved to be a useful criterion for separating virginoparous A. pisum instars in samples collected in southern Wisconsin.

Original languageEnglish (US)
Pages (from-to)1615-1619
Number of pages5
JournalThe Canadian Entomologist
Volume115
Issue number12
DOIs
StatePublished - Dec 1983

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