Iowa State University From the SelectedWorks of Andrew W. Lenssen 2007 Incorporating sheep into dryland grain production systems I. Impact on over-wintering larva populations of wheat stem sawfly, Cephus cinctus Norton (Hymenoptera: Cephidae) P. G. Hatfield Sue L. Blodge T. M. Spezzano H. B. Goosey Andrew W. Lenssen, United States Department of Agriculture, et al. Available at: hps://works.bepress.com/andrew_lenssen/52/