Bean IPM

Legume ipmPIPE Diagnostic Series

Seedcorn Maggot

Delia platura (Meigen, 1826)

The seedcorn maggot is yellowish white, legless and about ΒΌ inch (6 mm) long that can be active in early spring as it feeds on the germinating bean and seed. Wireworms are slender, yellowish, hard-bodied larvae that may grow to 1 inch (25 mm) or more in length; they feed on roots and hypocotyls. Both pests can cause plant stunting and death.

Factors favoring

Cool and wet conditions from planting to emergence, reduced tillage

Young plant with damage
Young plant with damage

H.F. Swartz and F.B. Peairs, Colorado State University

Photo credits

H.F. Swartz, Colorado State University