Entity scope
Cutworm is a practical name for larvae of several noctuid moths. Species, markings, hosts, and behavior vary.
Quick identity
- Scientific scope
- Noctuidae larvae (practical group)
- Entity scope
- Practical caterpillar group
- Broad form
- Stout smooth caterpillars, often gray, brown, green, or patterned; many curl when disturbed.
- Useful clue
- Many hide in soil or debris by day and feed near plant bases at night.
- Typical context
- Seedlings, vegetables, field crops, turf, and weeds, depending on species.
- Identification limit
- One organism, symptom, or photograph is not enough for reliable species certainty.
Key characteristics
- Stout smooth caterpillars, often gray, brown, green, or patterned; many curl when disturbed.
- Many hide in soil or debris by day and feed near plant bases at night.
- Host and habitat context matter: Seedlings, vegetables, field crops, turf, and weeds, depending on species.
- Color, size, and plant injury can overlap with unrelated organisms; preserve uncertainty when views are incomplete.
Life stages
01
Larva
Soil- or debris-hiding stage responsible for plant injury.
02
Adult moth
A noctuid moth; nearby adults do not identify the larval cause.
Where it is found
- Seedlings, vegetables, field crops, turf, and weeds, depending on species.
- Some cut seedlings at soil level; others climb and feed on foliage.
- Regional range and seasonal timing affect which species are plausible.
Behavior and activity
- Some cut seedlings at soil level; others climb and feed on foliage.
- Visible abundance can change with weather, plant condition, natural enemies, and life stage.
- Plant damage without the organism present does not establish the cause.
Diet and resources
- Plant or habitat relationship: Seedlings, vegetables, field crops, turf, and weeds, depending on species.
- Resource use varies within broad groups and should not be generalized beyond this entity scope.
Associated signs
Severed seedlings plus a nearby soil-hidden caterpillar are stronger together than either clue alone. These signs also have other pest and non-pest explanations.
Common lookalikes
Related larvae that may feed more openly or in groups.
C-shaped beetle larvae damaging roots rather than cutting stems.
Close identity needs markings and regional expertise.
Why it matters
Identity and impact are separate questions
A few larvae can matter to young plants, but severity depends on stage, species, abundance, and fresh injury.
- Do not infer the responsible species from damage alone.
- Assess current activity, affected area, plant health, and change over time before deciding whether action is warranted.
Management direction
- Search around fresh damage at dusk or just below soil.
- Photograph the whole larva and affected stem.
- Use crop-specific thresholds after confirming activity.
Have a pest photo to check?
Start a new photo identification. This Profile gives comparison context; it does not transfer certainty or diagnose your image.
Identify a photoReviewed guidance and sources
Last reviewed August 2026. Sources support the claims listed with them; their limits remain part of the review.
- University of Minnesota Extension — Cutworms
Supports: Behavior, soil-line injury, scouting, and crop context.
Does not support: Every noctuid larva or universal threshold.
Scope note: North American garden and landscape context; species, hosts, seasons, and local guidance vary.
- University of Minnesota Extension — Common insects in vegetable crops
Supports: Host crops, life-cycle context, damage patterns, scouting, and IPM context.
Does not support: Species certainty from damage alone or a universal pesticide program.
Scope note: North American garden and landscape context; species, hosts, seasons, and local guidance vary.