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EFFECT OF A NEW MOULT INHIBITOR (EL-494) ON THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

Arthur Retnakaran
Arthur Retnakaran
Affiliation:
Forest Pest Management Institute, Canadian Forestry Service, Sault Ste. Marie, Ontario P6A 5M7
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Abstract

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In laboratory tests on the spruce budworm, Choristoneura fumiferana (Clemens), EL-494®, a new moult-inhibiting insect growth regulator, was found to be more active than Dimilin. The EC50 determined by diet tests was 0.205 ppm for the 3rd, 0.249 for the 4th, 0.287 for the 5th, and 0.486 for the 6th instars. Stadial sensitivity was not detected.

In greenhouse tests this compound was found to be resistant to leaching and UV-degradation; the compound remained active on spruce foliage for at least 15 days. In preliminary field tests EL-494 showed good potential as a control agent.

Résumé

L’auteur trouva en laboratoire que l’EL-494®, un nouveau régulateur de croissance des insectes qui inhibite leur mue, était plus actif que la Dimiline contre la tordeuse Choristoneura fumiferana (Clemens) Le concentré émulsifiable (teneur : 50%) déterminé par tests de la diète, faisait 0.205 parties par million (ppm) chez le 3e stade, 0.249 ppm chez le 4e, 0.287 ppm chez le 5e et 0 486 ppm chez le 6e. La sensitivité stadiale ne fut pas détectée.

En serre, ce composé résista au lessivage et à la dégradation UV; il demeura actif sur le feuillage du Picea durant au moins 15 jours. Lors des essais provisoires sur le terrain, il se révéla prometteur en tant que moyen de lutte.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 7 , July 1979 , pp. 847 - 850
Copyright
Copyright © Entomological Society of Canada 1979

References

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