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Screening of Beauveria bassiana (Hyphomycetes) isolates against Choristoneura rosaceana (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  31 May 2012

Silvia I. Todorova ,
Daniel Coderre ,
Charles Vincent  and
Jean-Charles Côté
Silvia I. Todorova
Affiliation:
Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888, Succursale Centre-Ville, Montréal, Québec, Canada H3C 3P8
Daniel Coderre
Affiliation:
Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888, Succursale Centre-Ville, Montréal, Québec, Canada H3C 3P8
Charles Vincent*
Affiliation:
Horticultural Research and Development Centre, Agriculture and Agri-Food Canada, 430 Gouin Boulevard, Saint-Jean-sur-Richelieu, Québec, Canada J3B 3E6
Jean-Charles Côté
Affiliation:
Horticultural Research and Development Centre, Agriculture and Agri-Food Canada, 430 Gouin Boulevard, Saint-Jean-sur-Richelieu, Québec, Canada J3B 3E6
*
1Corresponding author (e-mail: vincentch@em.agr.ca).
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Abstract

Twenty-three isolates of Beauveria bassiana (Balsamo) Vuillemin from different hosts and geographical origins were evaluated under laboratory conditions for various aspects of virulence against 2- to 3-d-old third instars of the obliquebanded leafroller, Choristoneura rosaceana (Harris), a pest of apple, Malus domestica Borkhausen (Rosaceae), and several other orchard crops in North America. When submerged in a solution containing 107 conidia/mL, all B. bassiana isolates caused more than 66% larval and pupal mortality 60 d following treatment. Isolates 14, 16, 1525, 2727, and 2990 caused the highest (80–89%) larval and pupal mortality against C. rosaceana. Relative to the control, isolate 63 significantly increased and isolate 44860 significantly decreased larval development time. Isolates 37, 2727, and 2990 significantly decreased C. rosaceana pupal weight. Isolates 139, 2727, and 2990 significantly decreased the number of emerging females. In view of their larvicidal effects, as well as their carry-over effects on pupae and adult females, isolates 2727 and 2990 showed the best mycoinsecticidal potential against C. rosaceana.

Résumé

Vingt-trois isolats de Beauveria bassiana (Balsamo) Vuillemin provenant d'hôtes et d'origines géographiques différents ont été évalués en conditions de laboratoire pour déterminer différents aspects de leur virulence contre des larves de troisième stade âgées de 2 à 3 jours de la tordeuse à bandes obliques, Choristoneura rosaceana (Harris), un ravageur des vergers de pommiers, Malus domestica Borkhausen (Rosaceae), et de plusieurs autres cultures en Amérique du Nord. Soixante jours après une submersion dans une solution contenant 107 conidies/mL, tous les isolats ont causé plus de 66% de mortalités larvaire et pupale. Les isolats 14, 16, 1525, 2727 et 2990 ont causé la plus forte (80–89%) mortalité des larves et des pupes de C. rosaceana. Par rapport au témoin, l'isolat 63 a augmenté et l'isolat 44860 a diminué signifïcativement le temps de développement larvaire. Les isolats 37, 2727 et 2990 ont signifïcativement fait diminuer le poids des pupes de C. rosaceana. Les isolats 139, 2727 et 2990 ont fait diminuer de façon significative le pourcentage d'adultes femelles qui ont émergés suite au traitement. En raison de leurs effets larvicides, et de leurs effets délétères sur les pupes et les adultes femelles, les isolats 2727 et 2990 ont démontré le meilleur potentiel en tant que mycoinsecticide contre C. rosaceana.

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 1 , February 2002 , pp. 77 - 84
Copyright
Copyright © Entomological Society of Canada 2002

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