A Preliminary Report on Biosystematic Studies of Iowa Smartweeds (Polygonum Spp.)

The senior author first developed an interest in the smartweeds (Polygonum spp.) in connection with studies and survey work on the European corn borer (Pyrausta nubilalis Hubn.) and related borers. These are Pyrausta ainsliei Hein, the smartweed borer, and P. penitalis Grote, the lotus borer; both are native to North America, while P. nubilalis was introduced into this country from Europe and has become a serious pest of corn. This insect was first noticed in the United States in 1917 in the New England states. It gradually spread westward and was first reported in Iowa in 1943 from Clinton County. By last year (1947) it had spread throughout the state arid into eastern Nebraska

The western bean cutworm on beans and corn

1 sheet: ill.; 28 cm