What Is Eating My Tomato Plants at Night?

You go to bed with a healthy plant and wake up to find leaves stripped, stems chewed, or fruit gouged — with no culprit in sight. Night damage is its own detective puzzle, because the criminals have all gone into hiding by morning. The trick is to read the type of damage they left behind, and if needed, catch them in the act with a torch. Here are the usual nighttime raiders and how to identify yours.

Whole leaves and stems gone: hornworms

If large amounts of foliage vanish, leaving bare stems, and you spot dark green or black droppings on the leaves below, the offender is almost certainly the tomato hornworm. Although they feed during the day too, their damage often seems to appear overnight because they are so well camouflaged you do not notice them until the harm is done. These giant green caterpillars blend perfectly with the stems. Follow the droppings upward to find them, pick them off by hand, and drop them in soapy water. Bt spray is an effective backup for heavy numbers.

Ragged holes and slime: slugs and snails

Slugs and snails are the definitive night feeders. If you find irregular, ragged holes chewed in the lower leaves and gouges in low-hanging fruit, and you can see silvery, glistening slime trails on the leaves, soil or pots in the morning, these are your culprits. They shelter in damp, dark spots by day and come out to feed after dark, especially in wet weather. Hand-pick them at night by torchlight, set beer traps, clear damp hiding places near the stems, and ring the plants with a gritty barrier they dislike crossing.

Seedlings cut off at the base: cutworms

This one is heartbreaking and unmistakable. If young transplants or seedlings are found toppled, severed cleanly at or just above the soil line as if cut with scissors, the culprit is the cutworm. These are caterpillars that hide in the soil by day and emerge at night to chew through tender stems at ground level. Protect each transplant with a simple collar — a cardboard tube or cut plastic cup pushed an inch into the soil around the stem — which physically blocks them. Clearing weeds and disturbing the soil before planting also reduces them.

Small ragged feeding and shiny holes: earwigs and beetles

Earwigs feed at night and can chew small ragged holes in leaves and soft fruit; you will often find them hiding in tight, dark crevices by day, and a rolled-up damp newspaper left out overnight makes a handy trap to catch and remove them. Various beetles also feed after dark, leaving holes in the foliage. These are usually less destructive than hornworms or slugs, but worth identifying if the other suspects do not fit.

How to catch the culprit

When the damage type is not obvious, go out an hour or two after dark with a flashlight and inspect the plants, the undersides of leaves, and the soil surface. Most night feeders will be out working, and seeing them removes all doubt. Once you know who it is, the targeted fix — hand-picking, collars, traps, barriers or Bt — deals with it far better than any guesswork. Identify, then act on that specific pest, and the nightly losses stop.