ROBERTS, J. L. and OLSON, B.E. -- Effect of Euphorbia esula on growth and mortality of migratory grasshopper nymphs ...................................................................................... 97

DAVIS, F.M., WILLIAMS, W.P. and SORENSON, C.E. -- Evaluation of six maize hybrids for their susceptibility to feeding by three Diatraea spp. (Lepidoptera: Crambidea) by using laboratory bioassays .................................................................................................... 107

KINDLER, S.D. and DALRYMPLE, R.L. -- Relative susceptibility of cereals and pasture grasses to the yellow sugarcane aphid (Homoptera: Aphididae) ................................. 113

MORRILL, W.L. and KUSHNAK, G.D. -- Planting date influence on the wheat stem sawfly (Hymenoptera: Cephidae) in spring wheat ...................................................................123

KINDLER, S.D., JENSEN, K.B., and SPRING, T.L. -- Detection and characterization of mechanisms of resistance to Russian wheat aphid (Homoptera: Aphididae) in crested wheat grass ......................................................................................................................................129

KAUFMAN, P.E., LLOYD, J.E., KUMAR, R., and LYSYK, T.J. -- Horn fly susceptibility to Diazinon, Fenthion, and Permethrin at selected elevations in Wyoming .......................141

Notice to contributors ...................................................................................................159

Don't perish ..................................................................................................................160

Announcement ..................................................................................................................................161

Cochran Memorial Fund Patrons...................................................................................................162

Membership application ..........................................................................................................163

Attention ........................................................................................................164