Holes in Leaves? Match the Damage Pattern to the Pest

Start With the Shape of the Damage

Before you reach for a spray or start hunting under leaves at midnight, take a close look at the pattern of the holes themselves. Different pests feed in different ways, and the shape, size, and location of the damage narrows down the suspect list fast. Ask yourself: are the holes round or ragged? Is the leaf tissue gone entirely, or just the green layer between the veins? Are the edges chewed, or is the damage scattered across the middle of the leaf? These details matter more than the size of the pest population you can see, because many culprits feed at night or hide on the undersides of leaves during the day.

Skeletonized Leaves: Beetles That Leave the Veins Behind

If a leaf looks like lace, with only a papery network of veins remaining and all the soft tissue eaten away, you are almost certainly dealing with a beetle that feeds in groups. Japanese beetles are a classic offender in many gardens, clustering on roses, grapes, and beans and stripping leaves down to their skeletons within days. They feed during the day, so you can usually catch them in the act, often gathering in clusters on the very leaves they are destroying. Handpicking beetles into a bucket of soapy water in the early morning, when they are sluggish from the cool air, is one of the most effective non-chemical controls. If skeletonizing shows up on a single shrub year after year, consider whether nearby turf is hosting grubs, since the larvae overwinter in lawns before emerging as adults.

Ragged, Irregular Holes With Slime Trails: Slugs and Snails

Holes with soft, torn edges rather than clean cuts, especially on lower leaves close to the soil, point to slugs and snails. These mollusks rasp away leaf tissue with a tongue-like structure, leaving holes of no particular shape and often leaving a telltale silvery slime trail nearby. Damage tends to be worse after rain or heavy watering and in shady, humid corners of the garden. Because slugs and snails feed almost exclusively at night, a flashlight check an hour or two after dark is the most reliable way to confirm them. Reducing daytime hiding spots, such as thick mulch piled against stems or boards left on bare soil, cuts down their shelter considerably, and hand removal at night remains one of the simplest controls.

Small, Round Holes Scattered Across the Leaf: Flea Beetles

If a leaf looks like it has been hit with tiny buckshot, dozens of small round holes scattered across the surface, flea beetles are the likely cause. These tiny, dark beetles jump like fleas when disturbed, which is often the fastest way to identify them without a magnifying glass. They favor young seedlings of the cabbage family, eggplant, and radishes, and heavy feeding on new transplants can stunt or even kill them before they establish. Older, more mature plants usually tolerate flea beetle damage without much long-term harm. Floating row covers placed over seedlings right after planting are one of the most reliable ways to keep flea beetles off vulnerable young plants until they toughen up.

Notches Cut Into the Leaf Edge: Weevils

When the damage starts at the outer margin of the leaf and forms a series of curved or angular notches, rather than holes in the middle, weevils are usually responsible. Adult weevils have a distinctive elongated snout and tend to feed at night, chewing neat crescents along leaf edges as they work their way around the plant. Rhododendrons, azaleas, and various perennials are common targets. Unlike many beetles, weevils rarely fly, so a sticky barrier around the base of the trunk or stem, combined with a nighttime flashlight inspection, can help you spot and remove them. The notching itself is mostly cosmetic on established plants, but a heavy, repeated infestation is worth monitoring since the grub stage feeds on roots below the soil.

Large Chewed Sections and Missing Leaf Tips: Caterpillars

Big, irregular chunks missing from a leaf, sometimes entire leaves stripped down to the midrib, usually mean caterpillars are at work. Unlike the group feeding of skeletonizing beetles, caterpillar damage often starts at the leaf edge and works inward in larger bites, and you may notice dark, pellet-shaped droppings on leaves below the feeding site before you ever spot the caterpillar itself. Because many caterpillars match the color of the foliage they eat, run your hand gently along stems and the undersides of leaves to feel for their presence. Handpicking is effective and satisfying once you know where to look, and checking plants every few days during the growing season keeps a small problem from becoming a defoliated one.

When the Damage Doesn’t Match Any Pattern

Not every hole has an obvious culprit on sight, and that is normal. Sawfly larvae, for instance, can look like caterpillars but feed in tight groups and often skeletonize leaves along the edges rather than the center. Earwigs create irregular holes similar to slugs but tend to favor soft, new growth and flower petals. If you cannot pin down the pest from the pattern alone, combine your daytime observations with an evening inspection using a flashlight, since a surprising number of leaf-eating pests are strictly nocturnal. Keeping a simple note of which plants show damage and when can also reveal patterns over a season, helping you anticipate and intercept the same pest before it does as much harm next year.

Quick recap

• Lace-like, skeletonized leaves usually mean group-feeding beetles such as Japanese beetles.
• Ragged holes with slime trails near the soil point to slugs and snails, most active at night.
• Tiny scattered pinholes on seedlings are the signature of flea beetles.
• Notched leaf edges, rather than holes, suggest weevils feeding after dark.
• Large missing chunks or stripped leaves are typically the work of caterpillars, so check undersides and nearby droppings for confirmation.