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FECUNDITY OF MELANOPLUS SANGUINIPES (F.) IN TWO CRESTED WHEATGRASS PASTURES

Published online by Cambridge University Press:  31 May 2012

Norma E. Sanchez ,
Jerome A. Onsager  and
William P. Kemp
Norma E. Sanchez
Affiliation:
Rangeland Insect Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Bozeman, Montana, USA59717–0001
Jerome A. Onsager*
Affiliation:
Rangeland Insect Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Bozeman, Montana, USA59717–0001
William P. Kemp
Affiliation:
Rangeland Insect Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Bozeman, Montana, USA59717–0001
*
3Author to whom reprint requests should be addressed.
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Abstract

Oviposition rate (eggs per ♀-degree-day) and fecundity (total number of eggs per ♀) were measured in two populations of Melanoplus sanguinipes (F.) under natural conditions during two seasons (1984, 1985). Differences in fecundity between the two seasons were indirectly associated with differences in time of hatching. In 1985, females hatched earlier and had shorter preoviposition periods, greater longevities, and higher oviposition rates; consequently, fecundity averaged about three-fold greater than in 1984. Longevity appeared to be the most important single determinant of fecundity. Maximum fecundity was 73.2 eggs (equivalent to four pods) and mean fecundity ranged between 10.1 and 28.9 eggs per female.

Résumé

On a estimé le taux de ponte (oeufs par femelle par degré-jour) et la fécondité (nombre total d’oeufs par femelle) chez deux populations de Melanoplus sanguinipes (F.) en conditions naturelles au cours de deux saisons (1984, 1985). Des différences de fécondité entre les deux saisons ont été indirectement imputées à des différences de temps d’éclosion. En 1985, les femelles ont éclos plus tôt et ont montré des délais de préoviposition plus courts, des longévités supérieures et des taux de ponte plus élevés; par conséquent, la fécondité moyenne a été d’environ trois fois plus élevée qu’en 1984. La longévité est apparue comme le paramètre déterminant le plus important de la fécondité. La fécondité maximale a été de 73,2 oeufs (équivalant à quatre gousses d’oeufs) et la fécondité moyenne a varié 10,1 et 28,9 oeufs par femelle.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 1 , January 1988 , pp. 29 - 37
Copyright
Copyright © Entomological Society of Canada 1988

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