Tomato loopers are fast-developing caterpillars under favorable greenhouse and field conditions. Warm temperatures between 15°C and 30°C accelerate development, making early detection and control essential for protecting tomato crops.
Development Stages of Tomato Looper
Egg Stage
Eggs are laid singly on the undersides of older leaves and are dome-shaped with distinct ridges that can be seen under a 10x lens. Females lay clusters of 20–30 eggs which hatch in about 3–5 days, often going unnoticed until larvae start feeding.
Larval Stage
Larvae, recognized by their characteristic looping movement, feed on leaves, stems, and fruits. This stage lasts approximately 15 days, depending on the temperature. Caterpillars can cause extensive defoliation, weaken plants, and reduce fruit yield.
Pupal Stage
In greenhouses, pupae are often hidden in gutter edges, drain channels, or under groundcover, making them easy to miss. If they’re not found, adult moths emerge and quickly restart the cycle. Understanding where pupae hide helps growers break the cycle before the next generation begins. Pupation lasts about 7 days.
Adult Stage
Adult moths emerge from pupae, capable of flying, mating, and laying eggs. Female longevity ranges from 2–4 weeks, with each female laying 1,000–1,200 eggs during her lifespan which leads to a rapid population buildup.
Knowing the lifecycle of the tomato looper gives you the insight needed to act early and protect your crop from unnecessary feeding damage. To help you move from understanding to action, we created a full guide that covers scouting techniques, prevention strategies, and biocontrol recommendations tailored to greenhouse production. Sign up below to get the complete guide.