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SUSCEPTIBILITY OF THE BERTHA ARMYWORM, MAMESTRA CONFIGURATA (LEPIDOPTERA: NOCTUIDAE), TO COMMERCIAL FORMULATIONS OF BACILLUS THURMGIENSIS VAR. KURSTAKI1

Published online by Cambridge University Press:  31 May 2012

O.N. Morris
O.N. Morris
Affiliation:
Agriculture Canada Research Station, 195 Defoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

Commercial Bacillus thuringiensis var. kurstaki (B.t.k.) (Dipel 132® and Thuricide 48 LV®) were bioassayed at 20 and 25°C against 3rd- (L3), 4th- (L4), 5th- (L5), and 6th- (L6) instar larvae of the bertha armyworm, Mamestra configurata Walker, on greenhouse-grown canola, Brassica napus L. cv. Westar. The L4 was the most susceptible stage to B.t.k. but it was much less susceptible than the spruce budworm, Choristoneura fumiferana (Clem.), a species against which this bacterium is currently used. The lethal time of B.t.k. to the larvae was inversely related to dosage applied. Younger instars (L3 to L4) were more sensitive to Dipel than older instars (L5 to L6) at 20°C but the reverse was true for Thuricide-treated larvae. All B.t.k. treatments reduced weight gain and frass deposition (by inference feeding activity) compared with untreated controls. The LC50 concentration of B.t.k. for larvae reduced survival to adult emergence by 87–100%.

Résumé

On a fait des essais d’efficacité de préparations commerciales de Bacillus thuringiensis var. kurstaki (B.t.k.) (Dipel 132® et Thuricide 48 LV®) à des températures de 20 et 25°C sur les troisième (L3), quatrième (L4), cinquième (L5) et sixième (L6) stades larvaires de la légionnaire bertha, Mamestra configurata Walker, élevés en serre sur du colza canola, Brassica napus L. cv. Westar. La L4 s’est révélée le stade le plus sensible au B.t.k., quoique sa sensibilité soit de loin inférieure à celle de la tordeuse du bourgeon de l’épinette, Choristoneura fumiferana (Clem.), contre laquelle la bactérie est couramment utilisée. Le temps létal de B.t.k. envers les larves était inversement relié à la dose employée. À 20°C les stades larvaires plus jeunes (L3 et L4) étaient plus sensibles au Dipel que les stades ultérieurs (L5 et L6), mais l’inverse s’observait pour le traitement au Thuricide. Tous les traitements au B.t.k. ont diminué le gain de poids et réduit les dépôts d’excréments et de sciure (donc l’activité alimentaire) par rapport aux témoins non traités. La concentration LC50 de B.t.k. a abaissé de 87–100% le taux de survie des larves jusqu’au stade adulte.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 5 , May 1986 , pp. 473 - 478
Copyright
Copyright © Entomological Society of Canada 1986

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