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THE EFFECTS OF APPLICATION RATE AND SPRAY VOLUME ON EFFICACY OF TWO FORMULATIONS OF BACILLUS THURINGIENSIS BERLINER VAR. KURSTAKI AGAINST CHORISTONEURA ROSACEANA (HARRIS) (LEPIDOPTERA: TORTRICIDAE) ON RASPBERRIES

Published online by Cambridge University Press:  31 May 2012

S.Y. Li  and
S.M. Fitzpatrick
S.Y. Li
Affiliation:
Pacific Agriculture Research Centre, Agriculture and Agri-Food Canada, 6660 NW Marine Drive, Vancouver, British Columbia, Canada V6T 1X2
S.M. Fitzpatrick
Affiliation:
Pacific Agriculture Research Centre, Agriculture and Agri-Food Canada, 6660 NW Marine Drive, Vancouver, British Columbia, Canada V6T 1X2
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Abstract

The relative toxicities of two formulations (Dipel WP and Foray 48B) of Bacillus thuringiensis Berliner var. kurstaki to the obliquebanded leafroller, Choristoneura rosaceana (Harris), were determined in the laboratory. The effects of application rate (BIU per hectare) and spray volume (litres per hectare) on the efficacy of Dipel WP and Foray 48B against C. rosaceana were determined in raspberry fields. Mortality of C. rosaceana increased with application rate, and decreased with an increase in spray volume. Bacillus thuringiensis exhibited significantly longer residual activity al higher application rates and at lower spray volumes. The half-life (time at which 50% of original activity remains) of B. thuringiensis ranged from 2.45 to 6.68 days, depending upon application rate and spray volume. Laboratory and field studies indicate that Dipel WP and Foray 48B are highly and equally effective in killing larvae of C. rosaceana.

Résumé

La toxicité relative de deux produits (Dipel WP et Foray 48B) à base de Bacillus thuringiensis var. kurstaki sur la Tordeuse à bandes obliques, Choristoneura rosaceana (Harris), a été évaluée en laboratoire. Les effets de la dose (en BIU par hectare) et du volume appliqué (litres par hectare) sur l’efficacité des deux produits dans la lutte contre cette tordeuse ont été déterminés dans des cultures de framboisiers. La mortalité des tordeuses augmente en fonction de la dose et diminue lorsqu’ augmente le volume vaporisé. Bacillus thuringiensis a une activité résiduelle significativement plus longue à des doses plus fortes et des volumes moins élevés. La demi-vie (temps que persiste 50% de l’activité initiale) de B. thuringiensis se situe entre 2,45 et 6,68 jours, selon la dose et le volume appliqués. Les expériences en laboratoire et en nature ont démontré que les deux produits, Dipel WP et Foray 48B, sont tout aussi efficaces l’un que l’autre dans la lutte contre les larves de C. rosaceana.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 4 , August 1996 , pp. 605 - 612
Copyright
Copyright © Entomological Society of Canada 1996

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