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The wheat stem sawfly,  Cephus cinctus  Norton (Hymenoptera: Cephidae), is a key pest of wheat in the northern Great Plains of North America. Host plant resistance in the form of solid-stemmed wheat cultivars is the main control strategy for  C. cinctus.  This study investigated the effect of novel and traditional solid wheat hosts on the overwintering mortality and cold-hardiness of  C. cinctus.  Field conditions from 2003–2005 showed that overwintering mortality in various wheat cultivars averaged 8% and was not related to the type of wheat cultivar. Similarly, supercooling points (-22° C) were not influenced by wheat host type.  C. cintus  are cold-hardy; up to 80% survive 10 days at -20° C and 10% survive 40 days. Its overwintering microhabitat near the crown area of the plant is well insulated for temperatures above -10° C and remains ∼ 20° C above ambient minima. These data suggest that winter mortality is a minor factor in the population dynamics of wheat stem sawfly, and despite clear detrimental effects on larval weight and adult fitness, solid-stemmed cultivars do not reduce the ability of larvae to survive winters.

Solid-Stemmed Wheat Does Not Affect Overwintering Mortality of the Wheat Stem Sawfly,Cephus cinctus