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NOSEMA LOCUSTAE CANNING (MICROSPORIDA) SPORE POPULATIONS IN TREATED FIELD SOILS AND RESIDENT GRASSHOPPER POPULATIONS12

Published online by Cambridge University Press:  31 May 2012

J.J. Germida ,
A.B. Ewen  and
E.E. Onofriechuk
J.J. Germida
Affiliation:
Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
A.B. Ewen
Affiliation:
Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
E.E. Onofriechuk
Affiliation:
Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
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Abstract

The survival and persistence of Nosema locustae Canning in field soils and resident grasshopper populations in Saskatchewan were assessed in a 3-year study. Low levels of N. locustae spores persist in soils but not on vegetation from treated fields. Large numbers of spores were sometimes detected in soil depending on the extent of infection in the resident grasshopper populations. Indigenous soil microorganisms appear to prey upon N. locustae spores or utilize nutrients during spore decomposition. Nosema locustae infection in resident grasshoppers varied, depending on the viability of the spores applied, and its level was higher following repeated (3-year) applications. Low numbers of N. locustae spores persist in soil but large populations probably will not accumulate because of leaching and because of their interaction with soil microorganisms. Spores appeared to leach through soil as a function of water movement.

Résumé

La survie et la persistance de Nosema locustae Canning dans le sol et de populations indigènes de criquets en Saskatchewan ont été évaluées dans le cadre d’une étude de 3 ans. De faibles quantités de spores de N. locustae persistent dans le sol, mais pas sur la végétation des champs traités. Une forte densité de spores est parfois détectée dans le sol selon le degré d’infection des populations indigènes de criquets. Les micro-organismes terricoles semblent s’attaquer aux spores de N. locustae ou du moins utiliser les substances nutritives libérées par leur décomposition. L’infection des criquets par N. locustae varie selon la viabilité des spores appliquées et son niveau augmente avec des applications répétées (3 ans). De faibles quantités de spores de N. locustae persistent dans le sol, mais une forte densité est peu probable à cause du lessivage et de leur interaction avec les micro-organismes terricoles. Les spores semblent lessiver dans le sol en fonction du transport de l’eau.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 4 , April 1987 , pp. 355 - 360
Copyright
Copyright © Entomological Society of Canada 1987

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References

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