Comparison of Chemigated and Aerially-Applied Chlorpyrifos and Fenvalerate for Control of European Corn Borer (Lepidoptera: Pyralidae) Larvae

Authors

Thomas J. Weissling, University of Nebraska-LincolnFollow
Frank B. Peairs, Colorado State University - Fort Collins
Stan D. Pilcher, Colorado State University - Fort Collins

Date of this Version

1992

Comments

Published in J. Econ. Entomol. 85(2): 539-543 (1992) Copyright 1992 Entomological Society of America Used by permission

Abstract

Aerial and overhead center-pivot irrigation system (chemigated) applications of chlorpyrifos 4 emulsifiable concentrate (EC) and fenvalerate 2.4EC significantly reduced numbers of first- and second-generation European corn borer, Ostrinia nubilalis Hubner, larvae in field corn, Zea mays L. The number of first-generation O. nubilalis larvae, pupae, or cavities per plant in plots chemigated with chlorpyrifos in 1984 was significantly less than in plots where chlorpyrifos was applied aerially. A similar trend was observed for fenvalerate in 1985. No significant differences among application methods were observed for second-generation O. nubilalis treatments. Chlorpyrifos and fenvalerate were effective O. nubilalis control agents but efficacy differences between these two insecticides were variable. Corn yields did not vary significantly among application methods.