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ESTIMATED EGG DEPOSITION BY INVADING SPRUCE BUDWORM MOTHS (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

C. A. Miller ,
D. O. Greenbank  and
E. G. Kettela
C. A. Miller
Affiliation:
Canadian Forestry Service, Maritimes Forest Research Centre, Fredericton, New Brunswick E3B 5P7
D. O. Greenbank
Affiliation:
Canadian Forestry Service, Maritimes Forest Research Centre, Fredericton, New Brunswick E3B 5P7
E. G. Kettela
Affiliation:
Canadian Forestry Service, Maritimes Forest Research Centre, Fredericton, New Brunswick E3B 5P7
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Abstract

A 4000-ha block of spruce budworm, Choristoneura fumiferana (Clem.), infested forest in western New Brunswick was sprayed repeatedly in 1975 during the larval stage of budworm development. The objective was to reduce the population of the 1975 generation to a minimum level so that most of the following generation eggs found on the block could be attributed to invading females, thus providing data on the impact of moth invasion.

The presence of dispersing adults in the airspace over the block was monitored by a ground-based radar unit while light traps and pheromone-baited traps were used to confirm that invasion had taken place. A total egg population of 33.8 masses per m2 of foliage was found on the block and indirect estimates suggest that invading females deposited about 10 of these masses.

Résumé

Un bloc de 4 000 ha de forêt infestée par la Tordeuse des bourgeons de l’Epinette, Choristoneura fumiferana (Clem.) au Nouveau-Brunswick a été arrosé à maintes reprises en 1975 durant le stade larvaire de la Tordeuse. L’objectif visé était de réduire au minimum la population de la génération de 1975, afin que la plupart des oeufs de la génération suivante puissent être attribués aux femelles envahissantes, fournissant ainsi des données sur l’influence de l’invasion des papillons.

La présence des adultes se dispersant dans l’espace aérien au-dessus du bloc a été suivie de près par une unité radar pendant que des pièges lumineux et à phérormones étaient utilisés pour confirmer l’invasion. Une population totale d’oeufs à raison de 33.8 masses par m2 de feuillage fut relevée dans ce bloc et des évaluations indirectes ont supposé que les femelles envahissantes avaient pondu environ 10 de ces masses.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 6 , 01 June 1978 , pp. 609 - 615
Copyright
Copyright © Entomological Society of Canada 1978

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References

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