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THIODICARB AND SULPROPHOS APPLIED TO WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS (LEPIDOPTERA: TORTRICIDAE), WITH AN AERIAL SPRAY SIMULATOR1

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, California94701
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Abstract

Thiodicarb and sulprophos were applied to western spruce budworm, Choristoneura occidentalis Freeman, which were infesting small Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco. An aerial spray simulator was used for this application at three dosages. At 105 and 160 g a.i./ha, thiodicarb reduced the number of larvae/100 buds by at least 90%. Sulprophos failed to achieve the target mortality level of 90% or better, even at the highest dosage tested—at 380 g a.i./ha sulprophos reduced the number of larvae/100 buds by 74%. Thiodicarb appears to be the better candidate for future large-scale aerial tests.

Résumé

Des traitements au thiodicarb et au sulprophos ont été effectués contre la tordeuse occidentale de l'épinette, Choristoneura occidentalis Freeman infestant le sapin Pseudotsuga menziesii (Mirb.) Franco. Un simulateur d'arrosage aérien a été utilisé pour ces traitements effectués à 3 dosages. A 105 et 160 g IA/ha, le thiodicarb a réduit les nombres de larves/100 tiges d'au moins 90%. Le sulprophos n'a pas permis d'atteindre le niveau visé de mortalité de 90% ou plus, même au dosage tresté le plus élevé; à 380 g IA/ha, le sulprophos a réduit le nombre de larves/100 tiges de 74%. Le thiodicarb serait le meilleur choix pour les essais futurs de traitements aériens à grande échelle.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 4 , April 1983 , pp. 357 - 359
Copyright
Copyright © Entomological Society of Canada 1983

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References

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