Parasitism and the demography of wheat stem sawfly larvae, Cephus cinctus

Previous research has suggested that insect herbivores in protected environments have higher mortalities from biotic factors such as parasitism compared to herbivores in less protected situations, although overall mortalities in protected environments are often lower. However, this has not been exam...

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Bibliographic Details
Published in:BioControl (Dordrecht, Netherlands) Netherlands), 2011-12, Vol.56 (6), p.831-839
Main Authors: Peterson, Robert K. D, Buteler, Micaela, Weaver, David K, Macedo, Tulio B, Sun, Zhitan, Perez, Oscar Gerardo, Pallipparambil, Godshen R
Format: Article
Language:English
Subjects:
Adults
Agricultural production
Agriculture
Animal Biochemistry
Animal Ecology
Behavioral Sciences
Biological control
Biomedical and Life Sciences
Biotic factors
Cephidae
Cephus
Cephus cinctus
Cereals
Demography
Diapause
Eggs
Entomology
environment
Feeding
Females
Herbivores
host-parasite relationships
Hymenoptera
insect pests
Insects
Larvae
Life Sciences
Life tables
Mortality
Parasitism
Parasitoids
Pest control
Pests
Plant Pathology
plant pests
population density
Precipitation
summer
Triticum aestivum
Wheat
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Summary:Previous research has suggested that insect herbivores in protected environments have higher mortalities from biotic factors such as parasitism compared to herbivores in less protected situations, although overall mortalities in protected environments are often lower. However, this has not been examined using life table approaches. In this study, we used demographic methods to characterize the mortality dynamics of parasitism for pre-diapause wheat stem sawfly larvae, Cephus cintus Norton (Hymenoptera: Cephidae), a stem-mining wheat pest. Larvae were intensively sampled from commercial wheat fields at two locations in Montana, USA from 2005 through 2008. The feeding larvae present in the summer succumbed to only two mortality categories: parasitism and unknown factors. In Conrad, a location with relatively high densities of the parasitoids, mortality by parasitism was largely irreplaceable. In contrast, in Amsterdam, where parasitism did not occur to any appreciable degree, overall mortality remained relatively low.
ISSN:1386-6141
1573-8248
DOI:10.1007/s10526-011-9357-7