Seedcorn maggot (Delia platura) is a common pest that can cause significant damage to corn crops. By feeding on germinating seeds and young seedlings, its presence typically leads to stunted growth, reduced vigor, uneven stands, delayed crop emergence and lower yields. Weakened plants are also then more susceptible to disease and other stressors.
(Image Credit: Art Cushman, USDA Systematics Entomology Laboratory, Bugwood.org)
How to Identify Seedcorn Maggot
Identifying seedcorn maggot can be challenging, but there are key indicators to look out for, including:
Wilted or dead seedlings, especially in moist areas, may indicate seedcorn maggot feeding on the roots
Discolored or rotting seeds are also a clue, as seedcorn maggots feed on germinating seeds, causing them to decay
Small, white maggots can often be found in the soil near damaged plants
Regions Typically Affected by Seedcorn Maggot
Seedcorn maggot tends to be more prevalent in areas with cooler climates and heavy, poorly drained soils. The Midwest, including states like Iowa, Illinois and Indiana, is particularly susceptible.
(Image Credit: Howard F. Schwartz, Colorado State University, Bugwood.org)
When Does Seedcorn Maggot Affect Crops?
Typically appearing during the early season when soil temperatures fall within the range of 50°F to 86°F (10°C to 30°C), seedcorn maggots are particularly active in the first few weeks after planting.
How to Manage Seedcorn Maggot Infestations
Implement good agricultural practices such as proper crop rotation, timely planting, and maintaining optimal soil moisture levels. There are no rescue treatments for seedcorn maggot control in corn. Fields with a high risk of economic injury from seedcorn maggots may consider seed-applied or in-furrow insecticides.
When deciding whether to employ chemical products to control maggots, farmers should first assess the severity of the infestation and determine the economic threshold for treatment. In cases where infestation levels are high, the use of insecticides can serve as a supplemental control measure.
One popular option is Willowood Lambda-Cy 1EC**, an insecticide containing lambda-cyhalothrin, which is labeled for use on corn specifically for seedcorn maggot control.
Another option is GCS Bifenthrin 2EC**, which is another insecticide containing bifenthrin with similar label applications against seedcorn maggot.
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