Abstract
In 11 field tests at Ankeny, Iowa, with 1st- and 2nd-generation Ostrinia nubilalis (Hubner), field corn was grown in rows spaced 15, 20, 30, or 40 in. apart, and each spacing was provided with populations of 13,068, 17,242, or 26,136 plants per acre. Granular chemicals (diazinon in 1966 and DDT in 1967 and 1968) were applied with ground machinery at a rate of 1.00 lb active ingredient per acre for control of the corn borer. Neither the establishment nor the control of 1st- or 2nd-generation borers was significantly affected by row spacing or plant population. However, control tended to decrease as rows were grown closer together. Also, the amount of DDT in the leaves and whorls of samples from plants used to test 1st-generation borers did decrease significantly when the rows were closer together, and the same trend was evident in leaves from plots used to test the 2nd-generation borers. These results suggest as more feet or rows per acre of corn are grown, the higher the rate of insecticides necessary for contral of 1st- and 2nd-generation borers.
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