Seedcorn maggot (Diptera: Anthomyiidae) emergence in conventional and reduced-tillage soybean systems in Iowa [Hylemya platura]

Absolute population estimates, based on emergence trapping, were made for Hylemya platura (Mei-gen) 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. 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.