What Is Eating My Corn Seedlings at Ground Level?

Young corn seedlings cut off at or just below the soil surface, or shredded shoots appearing overnight, are a classic early-season problem. The damage pattern tells you which pest is responsible, and knowing that determines whether you need to dig, bait, cover or simply replant with protection in place. Three pests account for nearly all of this damage: slugs, cutworms, and birds.

Slugs — the most common culprit

Slugs attack corn seedlings at night, rasping through the stem at or just above soil level. The result is a cleanly or roughly severed seedling lying on the surface, or a stem grazed down to a stub with shiny slime trails nearby in the morning. Slugs are worst in cool, damp weather and in soils with plenty of organic matter. Scatter slug pellets (iron phosphate pellets are wildlife-safe) around seedlings at sowing and again when shoots emerge. Gritty material — coarse sand, crushed eggshell — around individual plants is a physical deterrent. Going out with a torch after dark lets you remove large numbers by hand.

Cutworms — cut and buried

Cutworms are the fat, grey-brown caterpillars of several moth species that live just below the soil surface and cut through seedling stems at night. Unlike slugs, they drag the cut seedling partially underground or leave the stem cut clean with no slime trail. Dig around the base of a damaged plant — you will often find the culprit curled up a few centimetres below the surface. Remove and destroy any you find. Disturbing the soil surface around seedlings regularly exposes eggs and young larvae to birds. Biological nematode treatments watered into the soil in early summer are effective.

Birds — uprooted whole

Crows, rooks, jackdaws and pheasants will pull corn seedlings straight out of the ground, apparently curious about the seed attached to the root. You will find whole seedlings lying uprooted nearby rather than cut stems. The damage happens in daylight. Fleece or horticultural mesh laid over the sown row for the first two weeks, pegged firmly at the edges, provides reliable protection. Once plants are 15–20 cm tall, birds usually lose interest.

Mice

Mice dig up seeds before they germinate or eat the emerging shoot just as it breaks the surface. They typically follow the drill exactly, leaving a neat row of holes. Wire mesh guards or mouse traps baited with peanut butter set along the row are effective.