Entity scope
This profile covers Manduca quinquemaculata while distinguishing the closely related tobacco hornworm.
Quick identity
- Scientific scope
- Manduca quinquemaculata
- Entity scope
- Species profile
- Broad form
- Large green caterpillar with diagonal pale markings and a rear horn.
- Useful clue
- Tomato hornworms typically have V-shaped side marks and a darker horn; tobacco hornworms tend toward straight marks and a red horn.
- Typical context
- Tomato and related solanaceous plants including eggplant, pepper, potato, and weeds.
- Identification limit
- One organism, symptom, or photograph is not enough for reliable species certainty.
Key characteristics
- Large green caterpillar with diagonal pale markings and a rear horn.
- Tomato hornworms typically have V-shaped side marks and a darker horn; tobacco hornworms tend toward straight marks and a red horn.
- Host and habitat context matter: Tomato and related solanaceous plants including eggplant, pepper, potato, and weeds.
- Color, size, and plant injury can overlap with unrelated organisms; preserve uncertainty when views are incomplete.
Life stages
01
Larva
Large foliage-feeding hornworm stage.
02
Adult
Five-spotted hawk moth stage; adults do not create feeding injury.
Where it is found
- Tomato and related solanaceous plants including eggplant, pepper, potato, and weeds.
- Larvae consume leaves and sometimes fruit while camouflaged along stems.
- Regional range and seasonal timing affect which species are plausible.
Behavior and activity
- Larvae consume leaves and sometimes fruit while camouflaged along stems.
- 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: Tomato and related solanaceous plants including eggplant, pepper, potato, and weeds.
- Resource use varies within broad groups and should not be generalized beyond this entity scope.
Associated signs
Rapid defoliation and large dark frass help locate larvae but do not distinguish Manduca species alone. These signs also have other pest and non-pest explanations.
Common lookalikes
Closely related with overlapping hosts and different marking tendencies.
Many hornworms need pattern and host comparison.
White parasitoid cocoons are not hornworm eggs.
Why it matters
Identity and impact are separate questions
Large larvae can remove foliage, but mature plants may tolerate limited feeding; species and abundance matter.
- 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
- Inspect stems and leaves near fresh frass.
- Photograph side markings and horn.
- Use tomato IPM and preserve parasitoids.
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 — Tomato hornworms
Supports: Species comparison, hosts, feeding, lifecycle, and parasitoids.
Does not support: Certainty from frass or defoliation.
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.