Hostname: page-component-848d4c4894-p2v8j Total loading time: 0.001 Render date: 2024-05-24T19:50:54.024Z Has data issue: false hasContentIssue false


Published online by Cambridge University Press:  31 May 2012

William D. Hutchison
Department of Entomology, University of Wisconsin, Madison 53706
David B. Hogg
Department of Entomology, University of Wisconsin, Madison 53706


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 instar 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.


La longueur des cornicules chez des larvs de Acyrthosiphon pisum (Harris) élevées au laboratoire est caractéristique du stade et n'est pas affectée par la températrre d'élevage. Une analyse multimodale de la longueur des cornicules chez des individus provenant du terrain a révélé des distributions præsentant clairement 4 modes (les stades) chez 5 populations différentes, et peu de chevauchement est apparu entre les distributions des différents stades. Cependant, les stades trois et quatre n'ont pu être séparés précisément pour les populations printannières du terrain, dû à la longueur réduite des cornicules chez les larves provenant des oeufs d'hivernement. La longueur des cornicules s'est avérée un critère utile pour sæparer les stades des virginopares de A. pisum dans des échantillons recueillis au sud du Wisconsin.

Copyright © Entomological Society of Canada 1983

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)


Davis, J. J. 1915. The pea aphis with relation to forage crops. Bull. U.S. Dep. Agric. 276. 67 pp.Google Scholar
Forbes, W. T. M. 1953. Note on multimodal curves. Ann. ent. Soc. Am. 46: 221224.CrossRefGoogle Scholar
Gilbert, N., Gutierrez, A. P., Frazer, B. D., and Jones, R. E.. 1976. Ecological Relationships. W. H. Freeman, San Francisco. 157 pp.Google Scholar
Harper, A. M. and Kaldy, M. S.. 1982. Effect of the pea aphid Acyrthosiphon pisum (Hemiptera (Homoptera): Aphididae), on yield and quality of forage alfalfa. Can. Ent. 114: 485489.CrossRefGoogle Scholar
Harper, A. M. and Lilly, C. E.. 1966. Effects of the pea aphid on alfalfa in southern Alberta. J. econ. Ent. 59(6): 14261427.CrossRefGoogle Scholar
Harper, A. M., Miska, J. P., Manglitz, G. R., Irwin, B. J., and Armbrust, E. J.. 1978. The literature of arthropods associated with alfalfa. III. A bibliography of the pea aphid, Acyrthosiphon pisum (Harris) (Homoptera: Aphididae). Spec. Publ. Ill. Agric. Exp. Stn. 50. 89 pp.Google Scholar
Kindler, S. D., Kehr, W. R., and Ogden, R. L.. 1971. Influence of pea aphids and spotted alfalfa aphids on stand, yield of dry matter, and chemical composition of resistant and susceptible varieties of alfalfa. J. econ. Ent. 64: 653657.CrossRefGoogle Scholar
Müller, F. P., Kabisch, U., and Reiher, H.. 1974. Unterscheidungsmerkmale der Larvenstadien der Grüstreifigen Kartoffelblattlaus Macrosiphum euphorbiae (Thomas) und der Erbsenblattlaus Acyrthosiphon pisum (Harris). Arch. Phytopathol. Pflanzenschutz, Berlin 3(10): 197209.CrossRefGoogle Scholar
Murdie, G. 199969. Some causes of size variation in the pea aphid, Acyrthosiphon pisum Harris. Trans. R. ent. Soc. Lond. 121(10): 423442.CrossRefGoogle Scholar
Way, M. J. 1973. Population structures in aphid colonies. pp. 76–84 in Lowe, A. D. (Ed.), Perspectives in Aphid Biology. Bull. ent. Soc. N.Z. 2. 123 pp.Google Scholar