What Is Eating My Zucchini Seedlings?

Raising zucchini from seed only to find the seedlings chewed to stubs, cut off at the base, or gone entirely by morning is a real gut-punch. Young zucchini seedlings are soft, succulent and defenceless, and several common pests target them — and because the plants are so small, the damage can be fatal within a night. Identifying the culprit quickly lets you protect any survivors and replacements. Let me walk you through the usual suspects and how to tell them apart.

Slugs and snails

The most common seedling-killers are slugs and snails. If your zucchini seedlings have ragged holes, are stripped of their soft leaves, or have vanished, and you find silvery slime trails on the soil or nearby in the morning, these are your culprits. They feed at night and in damp weather, and can clear a row of zucchini seedlings in a single night, drawn to the tender new growth. Hunt them after dark with a torch and hand-pick, set beer traps, clear damp hiding spots near the plants, and ring the seedlings with a gritty barrier like crushed eggshell or grit that they avoid crossing.

Cutworms

If seedlings are found cut off cleanly at or just above the soil line, toppled over as if snipped, the culprit is the cutworm. These soil-dwelling caterpillars hide just below the surface by day and emerge at night to chew through tender stems at ground level. They are devastating to young transplants. The classic defence is a collar around each seedling — a cardboard tube or cut plastic cup pushed an inch into the soil — which physically blocks the cutworm from reaching the stem. Clearing weeds and disturbing the soil before planting reduces them too.

Beetles and other chewers

Cucumber beetles attack zucchini seedlings too, chewing holes and, more dangerously, potentially spreading bacterial wilt and mosaic virus to a young plant that may not survive infection. If you see small striped or spotted yellow-green beetles and chewed holes, protect plants with row cover and control the beetles promptly. Various other beetles and caterpillars will also nibble seedlings, and earwigs can chew the soft growth at night. Birds occasionally tug at seedlings as well, especially newly emerged ones with the seed still attached.

Protecting young zucchini

The single best protection for vulnerable seedlings is a physical barrier. Floating row cover laid over the seedlings keeps out beetles and reduces other pest access while letting in light and water — just remove it once the plants flower so pollinators can reach them. Cloches or cut-bottle covers protect individual plants from slugs and cutworms alike. Starting seeds in pots and transplanting slightly larger, sturdier plants, rather than sowing tiny seedlings straight into pest-prone ground, also helps them survive the danger period. Match the damage to the pest — slime and ragged holes equals slugs; clean-cut toppled stems equals cutworms; holes with beetles equals cucumber beetles — then protect the rest. Zucchini grow fast once established, so shepherd them safely through those first weeks and they soon outgrow most threats.