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SEASONAL AND HOST PLANT EFFECTS ON PARASITISM OF COLORADO POTATO BEETLE BY MYIOPHARUS DORYPHORAE (RILEY) (DIPTERA: TACHINIDAE)

Published online by Cambridge University Press:  31 May 2012

David R. Horton
Affiliation:
Department of Entomology, Colorado State University, Fort Collins, Colorado, USA80523
John L. Capinera*
Affiliation:
Department of Entomology, Colorado State University, Fort Collins, Colorado, USA80523
*
1Author to whom reprint requests should be addressed.

Abstract

Parasitism of Colorado potato beetle, Leptirwtarsa decemlineata (Say), by the tachinid fly Myiopharus doryphorae (Riley) was monitored over four summers. Beetle larvae were collected from potato and a wild host species, Solanum sarrachoides Sendt., and allowed to complete development in the laboratory. Parasitism rates were high, averaging 67, 58, and 45% over the 4 years, in June, July, and August, respectively. Categorical analyses indicated that parasitism rates were dependent upon year, month, and host plant species of the beetle. During 1983–1985, rates were highest in June, and decreased over the summer; results for 1986 were somewhat atypical, with parasitism rates being low in June and increasing somewhat in August. Host plant effects on parasitism varied with year. During 1983–1984, rates were higher for beetles collected from potato than beetles collected from S. sarrachoides; this tendency was reversed in 1985.

Résumé

On a recensé le parasitisme du doryphore, Leptinotarsa decemlineata (Say) par la tachinide Myiopharus doryphorae (Riley), au cours de quatre saisons. On a procédé en laissant des larves de doryphore cueillies sur la pomme de terre et sur un hôte sauvage, Solanum sarrachoides Sendt., compléter leur développement au laboratoire. Les taux de parasitisme étaient élevés, en moyenne 67, 58 et 45% au cours des mois de juin, juillet, et août pour les 4 ans. Une analyse conçue pour les données de nature catégorique a indiqué que les taux de parasitisme dépendaient de l’année, du mois et de la plante hôte du doryphore. De 1983–1985, les taux étaient maximum en juin et baissaient au cours de l’été; le patron était atypique en 1986, le parasitisme étant faible en juin et augmentant quelque peu au août. L’effet de la plante hôte sur le parasitisme a varié avec l’année. En 1983–1984, les taux étaient plus hauts chez les doryphores cueillis sur la pomme de terre que ceux provenant de S. sarrachoides; cette tendance fût renversée en 1985.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1987

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