Guthrie, W.D. and F.F. Dicke. Resistance of inbred lines of dent corn to leaf feeding by 1st-brood European corn borers. 339

Shaw, R.H. and R.E. Felch. Climatology of a moisture-stress index for Iowa and its relationship to corn yields. 357

Garza, Antonio, J.M. Dunleavy and J. Hanway. Relation of calcium nutrition and bacterial populations on soybean roots to leaf chlorosis. 369

Hungerford, James J. Diatoms from seven Iowa rivers. 375

Vela-Cardenas, Mario and K.J. Frey. Optimum environment for maximizing heritability and genetic gain from selection. 381

Mock, J.J. and L.L. Buren. Classification of maize (Zea mays L.) inbreds for population tolerance by general combining ability. 395

Criswell, J.G. and R.M. Shibles. Influence of sink-source on flag-leaf net photosynthesis in oats. 405

La Perriere, Arthur J. and Arnold O. Haugen. Trends of mourning dove populations in Boone County, Iowa farm groves. 417

Knight, Harry H. Mineocapsus minimus new genus and new species; with a length of one millimeter this insect is a candidate for the smallest species in family Miridae (Hemiptera). 425

Showers, W.B. and G.L. Reed. Methods of infesting corn with the European corn borer. 429