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SIMULATING AERIAL SPRAYS FOR THE WESTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE): EVALUATION OF TECHNIQUE AND TWO CANDIDATE INSECTICIDES1

Published online by Cambridge University Press:  31 May 2012

Charles E. Richmond
Charles E. Richmond
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Berkeley, California 94701
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Abstract

A new spray application system which mimics the spray deposit of aerial applications of chemical insecticides was developed and tested using acephate at the rate of 60 g a.i./L (U.S. Environmental Protection Act registered dosage) on small Douglas-fir and subalpine fir trees infested with western spruce budworm. The system successfully duplicated aerial application by causing a budworm population reduction equivalent to previous aerial tests having analogous insecticide deposit characteristics. Using the system, preliminary information was gained on the effectiveness of sulprofos and thiodicarb. When delivered at a rate of 4.1 L/ha, sulprofos caused a budworm population reduction of 86.2% at 22.4 g a.i./L and thiodicarb caused a reduction of 98% at 45 g a.i./L.

Résumé

Un nouveau système de pulvérisation simulant le dépôt produit par une application aérienne d’insecticides chimiques a été mis au point et essayé avec l’acéphate à raison de 60 g i.a./L (dosage permis par la U.S. Environmental Protection Agency) sur de jeunes sapins Douglas et concolores infestés de tordeuse occidentale de l’épinette. Le système a reproduit fidèlement l’application aérienne en causant une baisse de population de la tordeuse équivalent à celle d’essais aériens dont les caractéristiques de dépôt sont analogues. A l’aide du système, de l’information préliminaire a été obtenue sur l’efficacité du sulprofos et du thiodicarb. Pulvérisé à 4.1 L/ha, le sulprofos a causé une réduction de 86.2% d’une population de tordeuse à 22.4 g i.a./L, et le thiodicarb a causé une réduction de 98% à 45 g i.a./L.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 9 , September 1981 , pp. 819 - 825
Copyright
Copyright © Entomological Society of Canada 1981

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References

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