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EFFECTS OF A SPLIT APPLICATION OF SEVIN-4-OIL® ON POLLINATORS AND FRUIT SET IN A SPRUCE–FIR FOREST

Published online by Cambridge University Press:  31 May 2012

Richard W. Hansen  and
Eben A. Osgood
Richard W. Hansen
Affiliation:
Department of Entomology, University of Maine, Orono, ME 04469USA
Eben A. Osgood
Affiliation:
Department of Entomology, University of Maine, Orono, ME 04469USA
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Abstract

Counts of four pollinating insect groups were taken in unsprayed forest localities and in areas sprayed with a split application of Sevin-4-oil® (carbaryl) for spruce budworm control. Results indicate a reduction of pollinator populations due to spraying.

Fruit set, measured by fecundity ratios (fruits/flower), was determined for Cornus canadensis L., Maianthemum canadense Desf., Clintonia borealis (Ait.) Raf., and Viburnum cassinoides L. in sprayed and unsprayed areas. Fecundity values for C. canadensis and M. canadense were significantly lower in sprayed than in unsprayed areas. Fruit set of C. borealis was apparently unaffected by carbaryl spraying, but the seed/flower ratio was significantly reduced in the sprayed area. V. cassinoides fecundity values were unaffected by carbaryl application. Reductions in native bee populations probably had the greatest impact on fruit set.

Résumé

Des comptages portant sur quatre groupes de pollinisateurs ont été faits à des sites forestiers non-traités de même qu'à des sites traités par application de Sevin-4-oil® contre la tordeuse des bourgeons de l'épinette. Les résultats indiquent une réduction des populations de pollinisateurs due au traitement.

La mise à fruit mesurée par le taux de fécondité (fruits/fleurs) a été déterminée pour Cornus canadensis L., Maianthemum canadense Desf., Clintonia borealis (Ait.) Raf., et Viburnum cassinoides L. aux sites traités et non-traités. Les taux de fécondité pour C. canadensis, M. canadense et V. cassinoides étaient significativement plus bas dans les endroits traités que dans les endroits non-traités. La mise-à fruit de C. borealis n'a apparamment pas été affectée par le traitement au carbaryl, mais le rapport fruits/fleurs était significativement réduit aux sites traités. Les taux de fécondité pour V. cassinoides n'ont pas été affectés par le traitement au carbaryl. Une baisse des populations d'abeilles indigènes a probablement été la cause majeure de la mise-à-fruit réduite.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 3 , March 1984 , pp. 457 - 464
Copyright
Copyright © Entomological Society of Canada 1984

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