Tomato Hornworms
Scientific Name
Manduca quinquemaculata
Description
Tomato hornworms are large, green caterpillars that feed voraciously on tomato plants. They are easily recognized by their prominent horn-like projection on the rear and their rapid defoliation of leaves.
Characteristics
These caterpillars can reach up to 4 inches in length and display a bright green body with distinct white stripes. Their heavy feeding can quickly strip plants of foliage, reducing photosynthetic capacity and fruit yield.
Control Methods
- Organic sprays: Use organic insecticidal soap or Bacillus thuringiensis (Bt) during early infestation stages to control larvae without harming beneficial organisms.
- Cultural practices: Practice crop rotation and interplant with repellent species to deter adult moths from laying eggs on tomato foliage.
- Preventive methods: Regularly inspect tomato plants for early signs of hornworm eggs or larvae and remove them promptly to prevent rapid population growth.
- Biological controls: Introduce natural predators such as parasitic wasps (e.g., Cotesia congregata), birds, and other beneficial insects that target hornworms.
- Mechanical physical: Hand-pick hornworms from plants and employ row covers during vulnerable growth stages to prevent moth access.
Natural Enemies
- Parasitic Wasps
- Birds
- Predatory Insects
Plants Affected by Tomato Hornworms
No associated plants found for this pest.