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BIONOMICS AND PATTERN OF ATTACK OF THE RED PINE SHOOT MOTH, DIORYCTRIA RESINOSELLA (LEPIDOPTERA: PYRALIDAE), IN WISCONSIN

Published online by Cambridge University Press:  31 May 2012

J. H. Hainze  and
D. M. Benjamin
J. H. Hainze
Affiliation:
Department of Entomology, University of Wisconsin, Madison, Wisconsin 53706
D. M. Benjamin
Affiliation:
Department of Entomology, University of Wisconsin, Madison, Wisconsin 53706
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Abstract

The bionomics of the red pine shoot moth, Dioryctria resinosella Mutuura, a newly described species of shoot borer in red pine, Pinus resinosa Ait., were investigated in Wisconsin sand plains plantations. The appearance of eggs, larvae, pupae, and adults are described. Head-capsule measurements indicated five larval instars. First-instar larvae overwintered in hibernacula. Shoot feeding was generally initiated by third-instar larvae in late May. Cones also were attacked. Pupation occurred in July. The flight period extended from mid-July to mid-September. The sex ratio was 0.53. Only red pine shoots and cones were attacked in a mixed pine stand. Infestation rates were highest along plantation edges, in the top half of the crown and in plantations greater than 20 years of age. Hyssopus rhyacioniae Gahan occurred most frequently among parasitoids reared from larvae and pupae.

Résumé

Les statistiques vitales de Dioryctria resinosella Mutuura, une espèce nouvellement décrite de perceur des pousses du pin Pinus resinosa Ait., ont été étudiées dans des plantations des plaines sablonneuses du Wisconsin. Les oeufs, larves, pupes et adultes sont décrits. Des mesures de capsule céphalique ont montré l'existence de cinq stades larvaires. Les larves de premier stade ont hiverné dans un hibernaculum. L'attaque des pousses a généralement commencé tard en mai. Les cônes sont aussi attaqués. La pupaison a eu lieu en juillet et le vol de la mi-juillet à la mi-septembre. Le rapport des sexes était de 0.53. Dans une plantation mélangée, seules les pousses de P. resinosa étaient attaquées. Les incidences d'infestation les plus fortes étaient localisées en bordure des plantations, dans la moitié supérieure de la couronne, et dans les plantations de plus de 20 ans. Hyssopus rhyacioniae Gahan était l'espèce de parasitoide la plus fréquemment identifiée parmi les espèces attaquant les larves et les pupes.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 9 , September 1983 , pp. 1169 - 1175
Copyright
Copyright © Entomological Society of Canada 1983

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