Effect of Host Plant Quality on the Sex Ratio and Fitness of Female Wheat Stem Sawflies (Hymenoptera: Cephidae)

Wendell L. Morrill; James W. Gabor; David K. Weaver; Gregory D. Kushnak; Norma J. Irish

doi:10.1603/0046-225X(2000)029[0195:EOHPQO]2.0.CO;2

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Wendell L. Morrill,¹ James W. Gabor,¹ David K. Weaver,¹ Gregory D. Kushnak,² Norma J. Irish³

¹Department of Entomology, Montana State University, Bozeman, MT 59717
²Western Triangle Research Center, Montana Agricultural Experiment Station, Conrad, MT 59425
³USDA–ARS, Bozeman, MT 59717

Abstract

Larvae of the wheat stem sawfly, Cephus cinctus Norton, feed and complete their development within the lumen of wheat and other hollow-stemmed grasses. Stems with large diameters are preferred and are the most suitable hosts. The sex ratios of wasps are male-biased in small stems and female-biased in large stems. Sawfly fitness, as indicated by wasp size, fecundity, and longevity, increases with host stem size.

Citation Download Citation

Wendell L. Morrill, James W. Gabor, David K. Weaver, Gregory D. Kushnak, and Norma J. Irish "Effect of Host Plant Quality on the Sex Ratio and Fitness of Female Wheat Stem Sawflies (Hymenoptera: Cephidae)," Environmental Entomology 29(2), 195-199, (1 April 2000). https://doi.org/10.1603/0046-225X(2000)029[0195:EOHPQO]2.0.CO;2

Received: 23 December 1998; Accepted: 29 October 1999; Published: 1 April 2000