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ISOLATION OF ASPERGILLUS PARASITICUS SPEARE AND BEAUVERIA BASSIANA (BALS.) VUILLEMIN FROM MELANOPLINE GRASSHOPPERS (ORTHOPTERA: ACRIDIDAE) AND DEMONSTRATION OF THEIR PATHOGENICITY IN MELANOPLUS SANGUINIPES (FABRICIUS)1

Published online by Cambridge University Press:  31 May 2012

K.C. Moore  and
M.A. Erlandson
K.C. Moore
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N 0X2
M.A. Erlandson
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N 0X2
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Abstract

Aspergillus parasiticus Speare and Beauveria bassiana (Bals.) Vuillemin were isolated from melanopline grasshoppers in Saskatchewan in 1986 and 1987. The pathogenicity of these isolates for Melanoplus sanguinipes (Fabricius) nymphs was assessed by topical, oral, and injected applications of 1.0 × 103, 104, or 105 conidia per individual. The A. parasiticus isolate was pathogenic to M. sanguinipes by injection and topical application but not orally. The B. bassiana isolate was pathogenic when injected or topically applied resulting in high mortality (82–100%), at all doses tested, between days 3 and 5 post-inoculation. Beauveria bassiana was infectious, at the highest dose tested, when orally applied with the majority of mortality occurring between 7 and 14 days post-inoculation.

Résumé

On a relevé la présence en 1986 et 1987 de Aspergillus parasiticus Speare et de Beauveria bassiana (Bals.) Vuillemin sur des criquets de la Saskatchewan. La pathogénicité de ces isolais sur Melanoplus sanguinipes (Fabricius) a l’état nymphal a été évaluée au moyen d’application de 1.0 × 103, 104 105 conidies par individu, par voie topique ou orale ou par injection. Aspergillus parasiticus s’est révélé pathogène pour M. sanguinipes par injection et par voie topique, mais pas par voie orale. Beauveria bassiana avait un effet pathogène par voie topique ou par injection et a donné lieu à un taux élevé de mortalité (82–100%) entre le 3e et le 5e jour après l’inoculation, et cela à toutes les doses évaluées. Appliqué par voie orale, B. bassiana était pathogène à la dose la plus forte, le gros de la mortalité survenant entre le 7e et le 14e jour après l’inoculation.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 11 , November 1988 , pp. 989 - 991
Copyright
Copyright © Entomological Society of Canada 1988

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