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Montana Field Guide

Montana Field Guides

Wheat Stem Sawfly - Cephus cinctus

Agricultural Pest
Native Species

Global Rank: GNR
State Rank: SNR

Agency Status


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General Description
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Species Range
Montana Range


Range Comments
One of the most serious insect pests of wheat across the northern Great Plains in North America (Beres et al. 2011). Genetic distance between C. cinctus from across the northern Great Plains of North America and C. hyalinatus in Asia is most supportive of a hypothesis of a native North American origin for C. cinctus (Lesieur et al. 2016). Across the Great Plains of North America, a phylogeographic analysis of mitochondrial markers and satellites from individuals identified morphologically as C. cinctus found a putative new undescribed species in western Montana and three haploptype groups consisting of: (1) a mountain cluster in southwest Montana and eastern Idaho; (2) a southern cluster ranging from south of Fort Peck Reservoir down to eastern Colorado; and (3) a northern cluster ranging from south central Montana up to and across the plains of Alberta, Saskatchewan, and Manitoba (Lesieur et al. 2016).

Observations in Montana Natural Heritage Program Database
Number of Observations: 53

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

For information and resources on plant pests and diseases see the USDA's Animal and Plant Health Inspection Service's Plant Pests and Diseases Profiles

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Citation for data on this website:
Wheat Stem Sawfly — Cephus cinctus.  Montana Field Guide.  .  Retrieved on , from