What is making holes in my garden leaves?
Chewing insects, slugs and snails, and sometimes larger animals leave holes. The size, shape and location of the damage, plus the time of day you see it, point to the culprit. Damage from hail, wind or disease can look similar, so check before assuming insects.
Look closely at the plants most affected, turn leaves over, and visit at dusk or early morning when many feeders are active.
Keep in mind that holes can appear long after the cause has left. A leaf that was chewed when it was small will show larger holes as it expands. If you cannot find any feeders, the damage may be old, and chasing a pest that is no longer there wastes time.
- Tiny round pinholes: often flea beetles
- Ragged holes, slime trails: slugs or snails
- Big chewed areas, droppings: caterpillars or beetles
How can I identify the culprit?
Droppings, slime trails and the insects themselves are the strongest evidence. Caterpillars leave dark pellets, slugs leave a shiny trail, and beetles often drop when disturbed. A hand lens helps.
Extension offices publish photo guides to vegetable pests. Compare what you find with those guides, or send a photo or sample to your county office for identification.
- Check leaf undersides and the soil surface
- Scout in the evening with a flashlight
- Photograph insects and damage for identification
Is the damage serious enough to act on?
Many plants tolerate some leaf loss without any drop in harvest, especially when the part you eat is not the leaf. A tomato plant with several chewed leaves will likely still produce, whereas a seedling that loses most of its leaves may not survive.
Consider the stage of the plant, the extent of damage and the crop. Leafy greens are harmed more visibly than fruiting crops, so you may want to act sooner on lettuce than on squash.
Think about the crop's value to you. A few holes in kale leaves are cosmetic and the leaves are still fine to eat after washing, whereas holes in a plant you grow for flowers or for sale may matter more. Decide in advance what level of damage you can live with, and check weekly instead of daily.
- Protect seedlings first
- Tolerate light damage on mature plants
- Track whether damage is spreading week to week
What non-chemical steps work first?
Hand picking, row covers and barriers deal with many problems without any spray. Row covers keep flea beetles and egg-laying adults off young plants, and picking caterpillars and beetles off in the morning keeps numbers down on a small plot.
Healthy soil and varied plantings support natural enemies that eat many pests. Clean up plant debris at season's end so pests have fewer places to overwinter.
Slugs and snails respond to simple changes in habit. Water in the morning so the surface dries before night, remove boards and debris they hide under, and give plants room for air to move. Handpicking at dusk with a flashlight and a container of soapy water is a low-cost routine many gardeners rely on.
- Cover young plants with floating row cover
- Remove egg clusters and larvae by hand
- Rotate crops and tidy debris in fall
What if I need a pesticide?
Start with correct identification, because a product that works on one pest may do nothing on another and may harm beneficial insects and pollinators. The label is the law, so follow it exactly, including which crops it may be used on and how long to wait before harvest.
Your extension office can advise on options suited to your crop and local rules. Never apply products to flowering plants that bees are visiting, and keep children and pets away as the label directs.
- Identify the pest before choosing anything
- Read the whole label before buying
- Store products out of reach of children and animals
How do I prevent holes next season?
Plan crop rotation, plant at the right time so seedlings are not meeting peak pest numbers, and use covers on the crops that suffer most. Keep notes on what chewed what and when.
Healthy, well-watered plants cope better with feeding damage, so do not neglect basics like soil, water and spacing.
Record your findings in a simple log. Write the pest, the plant, the date first seen and what worked. Over a few seasons you will see which pests arrive when, and you can time covers or checks ahead of them instead of reacting afterward.
Key takeaways
- Use the size, shape and timing of the damage to identify the feeder.
- Light leaf damage on mature plants often does not need action.
- Physical controls like covers and hand picking come first.
- If you do use a pesticide, identify the pest and follow the label exactly.
Sources and further reading
Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.