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Mancozeb resistance patterns among Kampimodromus aberrans and Typhlodromus pyri (Acari: Phytoseiidae) strains from French vineyards

Published online by Cambridge University Press:  02 April 2012

Philippe Auger*
Affiliation:
Ecole Nationale Supérieure Agronomique / Institut National de la Recherche Agronomique, Unité d'Ecologie animale et Zoologie agricole, Laboratoire d'Acarologie, 2, Place Pierre Viala, 34060 Montpellier CEDEX 01, France
Romain Bonafos
Affiliation:
Ecole Nationale Supérieure Agronomique / Institut National de la Recherche Agronomique, Unité d'Ecologie animale et Zoologie agricole, Laboratoire d'Acarologie, 2, Place Pierre Viala, 34060 Montpellier CEDEX 01, France
Serge Kreiter
Affiliation:
Ecole Nationale Supérieure Agronomique / Institut National de la Recherche Agronomique, Unité d'Ecologie animale et Zoologie agricole, Laboratoire d'Acarologie, 2, Place Pierre Viala, 34060 Montpellier CEDEX 01, France
*
1Corresponding author (e-mail: [email protected]).

Abstract

Laboratory bioassays were carried out on two species of phytoseiid mites to investigate their resistance to the fungicide mancozeb. Susceptible and suspected resistant strains of Kampimodromus aberrans (Oudemans) and Typhlodromus pyri Scheuten were tested. Mancozeb resistance factors were low to moderate: they reached 6.3 and 11.7 for K. aberrans and T. pyri, respectively. Intrinsic toxicity of mancozeb was approximately 5–10-fold more pronounced in females of K. aberrans than in females of T. pyri. The female susceptibility pattern of the most resistant strain of K. aberrans was quite close to that of the most susceptible strain of T. pyri. The LC50 values for the most resistant strains of K. aberrans and T. pyri were 4.6 and 43 times higher, respectively, than the maximum field application rate of mancozeb recommended for control of downy mildew in vineyards. Using a diagnostic concentration, a limited survey in vine plots indicated that most of the K. aberrans strains we tested were susceptible to mancozeb, but a few consisted of both resistant and susceptible individuals. All strains of T. pyri collected in Burgundy were susceptible. Half of the T. pyri strains from Bordeaux were susceptible and the other half were mixed populations of resistant and susceptible individuals.

Résumé

Des essais de laboratoire ont été réalisés avec deux espèces de Phytoseiidae pour évaluer leur résistance à un fongicide, le mancozèbe. Des populations sensibles et des populations soupçonnées de résistance de Kampimodromus aberrans (Oudemans) et Typhlodromus pyri Scheuten ont été testées. Les coefficients de résistance sont faibles à modérés et atteignent 6,3 et 11,7 pour K. aberrans et T. pyri, respectivement. La toxicité intrinsèque du mancozèbe est 5 à 10 fois plus forte pour les femelles de K. aberrans que pour les femelles de T. pyri. La sensibilité au mancozèbe de la population de K. aberrans la plus résistante est comparable à celle de la population de T. pyri la plus sensible. Les CL50 des populations les plus résistantes de K. aberrans et de T. pyri sont obtenues respectivement avec des concentrations 4,6 et 43 fois supérieures à la dose maximale recommandée de mancozèbe pour lutter contre le mildiou de la vigne. Une enquête réalisée sur un nombre limité de parcelles de vigne, en utilisant une concentration diagnostique de mancozèbe, tend à montrer que la majorité des populations de K. aberrans testées sont sensibles à ce fongicide, seules quelques unes comportant des individus sensibles et des individus résistants en mélange. Toutes les populations de T. pyri échantillonnées en Bourgogne sont sensibles au mancozèbe. La moitié des populations échantillonnées dans le Bordelais est sensible, l'autre moitié correspond à des populations résistantes ou composées d'un mélange d'individus sensibles et résistants.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 2004

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