Seedcorn Maggot (Diptera: Anthomyiidae) Emergence in Conventional and Reduced-Tillage Soybean Systems in Iowa1

Abstract

Absolute population estimates, based on emergence trapping, were made for Hylemya platura (Meigen) during germination in four typical Iowa soybean tillage systems (fall moldboard-plow, fall chisel-plow, till-plant, and no-tillage). The emergence trapping method gave acceptable levels of precision for an intensive sampling program. Although significant differences in emergence were found between tillage systems, numbers of seedcorn maggots present were not a serious problem in any system. Emergence was greatest in the fall chisel-plow system, followed by the till-plant system. Emergence in the no-till and fall moldboard-plow system was similar. Comparisons of emergence between within row and between-row areas in these systems suggested that germinating soybeans were not attractive for oviposition under field conditions. Surface corn residue and soil moisture were not significant factors influencing oviposition and development.