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SOME POPULATIONAL RELATIONSHIPS BETWEEN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE) AND SPRUCE CONEWORM, DIORYCTRIA RENICULELLOIDES (LEPIDOPTERA: PYRALIDAE)1

Published online by Cambridge University Press:  31 May 2012

C. J. Spies III  and
J. B. Dimond
C. J. Spies III
Affiliation:
Department of Entomology, University of Maine, Orono, Maine 04469
J. B. Dimond
Affiliation:
Department of Entomology, University of Maine, Orono, Maine 04469
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Abstract

Coincident populations of spruce budworm, Choristoneura fumiferana (Clem.) and spruce coneworm, Dioryctria reniculelloides (Mutuura and Munroe) were studied to compare spatial distribution, temporal abundance, relative abundance on spruce species, and the relative efficacy of aerial insecticide treatments.Most individuals of both species were found overwintering on the mid-crown branches of red spruce, and a whole branch is a suitable unit for simultaneous sampling of overwintering budworm/coneworm populations on red spruce. Survey records since 1949 show similar geographical and temporal population trends for these 2 insects in Maine. A correlation analysis (r = 0.87) indicates that the size of their coincident populations is related spatially. Both species were found overwintering in nearly equal proportions on red and white spruce sampled from the same stands. But twice as many budworm and coneworm were found overwintering on red spruce when red and black spruce were sampled on the same stands. Due to behavioral or physiological traits the coneworm appeared resistant to aerial spray treatments that significantly reduced budworm populations.

Résumé

Des populations coincidentes de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clem.) et la pyrale des cônes de l'épinette, Dioryctria reniculelloides (Mutuura et Munroe) ont été suivies pour comparer leur répartition spatiale, les fluctuations temporelles de leur abondance, leur abondance relative sur différentes espèces d'épinette et l'efficacité relative des applications aériennes d'insecticide.

On a trouvé que la majorité des individus des deux espèces d'insectes hivernaient dans les branches situées au milieu de la cime de l'épinette rouge, et que la branche entière est une unité convenable à l'échantillonnage simultané des populations hivernantes de la tordeuse et de la pyrale sur l'épinette rouge. Des données de surveillance remontant à 1949 montrent des tendances géographique et temporelle semblables des populations de ces 2 insectes au Maine. Une analyse de corrélation (r = 0.87) indique que les tailles de ces populations coïncidentes sont spatialement liées entre elles. Les deux espèces ont été trouvées hivernant dans des proportions presque égales sur l'épinette rouge et l'épinette blanche échantillonnées à partir des mêmes peuplements. Cependant, deux fois plus de tordeuses et de pyrales ont été trouvées hivernant sur l'épinette rouge lorsque les échantillons provenaient de peuplements d'épinette rouge et d'épinette noire. Dû à certaines caractéristiques comportementales et physiologiques, la pyrale est apparue résistante à des pulvérisations d'insecticide ayant réduit significativement les populations de tordeuse.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 2 , February 1985 , pp. 193 - 202
Copyright
Copyright © Entomological Society of Canada 1985

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