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Potential impact of spinosad on parasitoids of Mamestra configurata (Lepidoptera: Noctuidae)

Published online by Cambridge University Press:  31 May 2012

P.G. Mason ,
M.A. Erlandson ,
R.H. Elliott  and
B.J. Harris
P.G. Mason*
Affiliation:
Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6
M.A. Erlandson
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, Saskatchewan, Canada S7N 0X2
R.H. Elliott
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, Saskatchewan, Canada S7N 0X2
B.J. Harris
Affiliation:
Dow Agro-Sciences Canada Inc, 1144-29th Avenue NE, Calgary, Alberta, Canada T2J 5R7
*
1Corresponding author (e-mail: masonp@em.agr.ca).
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Abstract

The effects of the biologically derived insecticide spinosad on parasitoids of Mamestra configurata Walker were studied. Adult Trichogramma inyoense Pinto and Oatman (Hymenoptera: Trichogrammatidae), an egg parasitoid, were as susceptible to a dose of 0.125 μg/cm2 as they were to a high dose of 2.0 μg/cm2. Application of spinosad to host eggs at the time of oviposition resulted in significantly reduced T. inyoense parasitism and higher parasitoid mortality in parasitized eggs. Adult Microplitis mediator (Haliday) (Hymenoptera: Braconidae), a larval endoparasitoid, were highly susceptible at the highest dose tested, 1.0 μg/cm2. Spinosad at 2.0 μg/cm2 fed to larval M. configurata parasitized with M. mediator 1 and 7 d previous caused similar mortality to that for nonparasitized larvae. At a dose of 0.125 μg/cm2, only larvae parasitized 1 d previously showed mortalities similar to those of nonparasitized larvae, whereas larvae parasitized 7 d previously were not affected by this low dose. Larval M. mediator that egressed from hosts parasitized 7 d previously and treated with the low dose were unable to complete cocoon formation and died. This study suggests that integrated pest management programs for M. configurata in canola should include evaluating the presence and abundance of parasitoids.

Résumé

On trouvera ici les résultats d'une étude sur les effets d'un insecticide, le spinosad, un dérivé biologique, sur les parasitoïdes de Mamestra configurata Walker, la Légionnaire bertha. Les adultes de Trichogramma inyoense Pinto et Oatman (Hymenoptera : Trichogrammatidae), un parasitoïde des oeufs, se sont avérés aussi sensibles à une dose de 0,125 μg/cm2 qu'à une forte dose de 2,0 μg/cm2. L'application de spinosad aux oeufs de l'hôte au moment de la ponte a eu pour résultat de réduire le parasitisme de T. inyoense et donné lieu à une mortalité accrue des parasitoïdes dans les oeufs parasités. Les adultes de Microplitis mediator (Haliday) (Hymenoptera : Braconidae), endoparasite larvaire, se sont montrés très sensibles à la plus haute dose testée, 1,0 μg/cm2. Du spinosad à raison de 2,0 μg/cm2, administré à des larves de légionnaires parasitées par M. mediator 1 à 7 jours auparavant a entraîné une mortalité du même ordre que celle enregistrée dans le cas de larves non parasitées. À une dose de 0,125 μg/cm2, seules les larves parasitées 1 jour auparavant avaient des taux de mortalité semblables à ceux des larves non parasitées et cette faible dose est restée sans effet sur les larves parasitées 7 jours auparavant. Les larves de Microplitis mediator émergées d'hôtes parasités 7 jours auparavant et traités à une faible dose de spinosad ont été incapables de compléter la construction de leur cocon et elles sont mortes. L'intégration de spinosad dans un programme de lutte contre Mamestra configurata devrait comporter une évaluation préalable de la présence et de l'abondance de parasitoïdes.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 1 , February 2002 , pp. 59 - 68
Copyright
Copyright © Entomological Society of Canada 2002

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