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EPIZOOTIOLOGY OF A NOSEMA SP. (MICROSPORIDA: NOSEMATIDAE) INFECTING THE GRASSHOPPER CHORTHIPPUS CURTIPENNIS (HARRIS) (ORTHOPTERA: ACRIDIDAE)

Published online by Cambridge University Press:  31 May 2012

D.A. Streett  and
S.A. Woods
D.A. Streett
Affiliation:
Rangeland Insect Laboratory, USDA/ARS, Montana State University, Bozeman, Montana, USA 59717-0366
S.A. Woods
Affiliation:
Rangeland Insect Laboratory, USDA/ARS, Montana State University, Bozeman, Montana, USA 59717-0366
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Abstract

Epizootiological studies of a Nosema sp. in field populations of the grasshopper Chorthippus curtipennis (Harris) were conducted in Madison County, Montana. The average density and percentage prevalence for each modal stage are reported for two sites from 1986 through 1990. Alternating high and low densities of C. curtipennis were observed during even and odd years, respectively. Prevalence of Nosema in C. curtipennis during a high density year was characterized by an increase in prevalence during nymphal development. Furthermore, prevalence of Nosema in C. curtipennis was positively related to host density, suggesting some form of density-dependent transmission.

Résumé

Une étude épizootiologique de Nosema sp. a été entreprise chez des populations naturelles du criquet Chorthippus curtipennis (Harris) dans le comté de Madison au Montana. La densité moyenne et la prévalence (en pourcentage) de chaque stade modal ont été évaluées à deux endroits, de 1986 à 1990. La densité de C. curtipennis s’est avérée élevée les années paires et faible les années impaires. La prévalence de Nosema chez les criquets au cours d’une année de forte densité se caractérisait par une augmentation de la prévalence durant le développement larvaire. De plus, la prévalence de Nosema chez C. curtipennis était en corrélation positive avec la densité des hôtes, ce qui laisse supposer une forme de transmission étroitement reliée à la densité.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 125 , Issue 3 , June 1993 , pp. 457 - 461
Copyright
Copyright © Entomological Society of Canada 1993

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