Common Vegetable Garden Pests: An ID & Control Guide

GardenDraft Team · June 9, 2026 · Updated September 25, 2026 · 8 min read

Every vegetable garden gets pests, and most chewed leaves don't matter. The job is spotting the few pests that can cost you a crop. Match the damage to the likely culprit below, decide whether it's worth acting on, then follow the link to that pest's control guide.

Look before you spray

Most insects in a garden are pollinators, decomposers or predators that eat pests. A broad spray at the first chewed leaf kills more of them than of the pest, and can leave you with the same pest and fewer predators to keep it down.

Identify the pest before you treat it. Check plants in the morning, look under leaves where eggs and small insects hide, and take a close photo to compare against a university extension page. The damage pattern often tells you as much as the insect.

Start with the damage pattern

Ask how the plant is being eaten.

Damage you see	Likely pests	First move
Tender tips curled, sticky, or crowded with tiny soft insects	Aphids, whiteflies	Blast with water, then check whether lady beetles, lacewings, or parasitoid mummies are already working
Fine pale speckling, bronzed leaves, webbing in hot dry weather	Spider mites	Rinse leaf undersides, reduce drought stress, and avoid dusty dry conditions
Tiny shot holes in young leaves, especially brassicas and eggplant	Flea beetles	Protect seedlings with row cover before damage starts
Ragged holes, dark droppings, missing leaves	Cabbage worms, tomato hornworms	Handpick; use Bt only when young caterpillars are actively feeding
Seedlings cut off at soil level overnight	Cutworms	Add collars around new transplants and clear weeds from the bed edge
Squash leaves wilting, stems damaged, bronze eggs on leaves	Squash bugs and vine borers	Scout early, remove egg masses, and protect young plants before bloom
Cucumber plants suddenly wilt, beetles on leaves or flowers	Cucumber beetles	Use row cover while plants are young, then uncover for pollination
Irregular holes in low leaves, slime trails, damage after rain	Slugs and snails	Remove hiding places, water in the morning, and handpick at dusk

You don't need to know insect families. Sap-sucking, chewing, stem damage and seedlings cut at the soil line each call for a different fix, so sorting the damage into one of those gets you most of the way.

Decide whether to act

One damaged leaf isn't an emergency. Seedlings need protection sooner because they have few leaves to spare, while established tomatoes, peppers, beans, squash and kale can lose some foliage and keep growing. Act when damage is spreading to new growth or reaching the part you eat.

A weekly check takes five minutes:

Scan the newest growth first.
Flip leaves and check the undersides.
Look for eggs, droppings, webbing, and sticky honeydew.
Check the same plant again two or three days later before escalating.

If numbers are steady and predators are present, waiting is often the best control. If the population is climbing, plants are stunted, seedlings are disappearing or fruit is damaged, use the narrowest control that matches the pest.

Prevention

Healthy plants in well-prepared soil tolerate damage that would set back a stressed plant. Steady watering matters too: drought-stressed vegetables stall more after feeding damage, and hot, dry plants are prone to spider mites.

Floating row cover keeps egg-laying moths and beetles off a crop entirely. Put it over cabbage-family seedlings for cabbage worms and flea beetles, over young cucumbers for cucumber beetles, and over squash until it flowers. It has to go on before the pests arrive; it can't help once they're already under it.

Companion planting gives predators somewhere to live. Small flowers such as alyssum, dill, cilantro, calendula and marigolds draw hoverflies, lacewings and parasitic wasps. They won't clear an infestation, but they make it harder for one pest to take over.

Rotation and cleanup

Some pests spend the winter in the soil where their host crop grew. Colorado potato beetle adults overwinter in and around last year's potato bed and walk to the nearest potatoes in spring, so planting potatoes farther away each year (crop rotation) delays them. Squash vine borers overwinter as larvae or pupae an inch or two down in last year's squash bed. The adult moths fly, so moving squash won't keep them away, but row cover only works over a bed where squash didn't grow last year: over the old bed, the moths emerge underneath it.

At the end of the season, pull badly infested plants rather than composting them in place, and clear weeds along bed edges where cutworms and flea beetles shelter. Don't leave cull fruit under plants, where pests and diseases build up.

Narrow controls first

When prevention isn't enough, match the treatment to the pest.

Water spray: best for aphids, whiteflies, and spider mites when caught early.
Handpicking: still the fastest fix for hornworms, cabbage worms, squash bug adults, and egg masses.
Barriers: collars for cutworms, row cover for flea beetles and brassicas, and netting or hoops where pressure repeats every year.
Biological products: Bt targets young caterpillars but doesn't solve aphids, mites, beetles, or squash bugs.
Soaps and oils: useful for soft-bodied insects, but only when sprayed directly and only when temperatures are safe for the crop.

Follow the label on any product you buy, organic ones included; "organic" doesn't mean safe for pollinators or tender leaves. If you have to spray, do it late in the day, keep off open flowers, and treat only the crop with the problem.

By crop

If you know the crop but not the pest:

Tomatoes: hornworms.
Brassicas: cabbage worms and flea beetles; row cover from transplant day.
Cucumbers: cucumber beetles.
Squash and pumpkins: squash bugs and vine borers, especially in the first half of the season.
Seedlings of almost anything: cutworms, flea beetles and slugs.

Some damage that looks like pests is disease or growing conditions. For yellowing or curling tomato leaves, see the tomato leaf diagnosis chart; for spreading brown lesions on tomatoes and potatoes, early vs. late blight; for cucumbers that wilt after beetle feeding, the bacterial wilt section of the cucumber beetle guide; and for a white coating on squash and cucumber leaves, powdery mildew.

Frequently asked questions

Should I kill every insect I find in my garden?: No. Most insects in a garden are pollinators, decomposers or predators that eat pests. Identify a pest before acting, since a broad spray kills more of them than of the pest.
What's the best way to prevent garden pests?: Healthy plants in good soil, floating row cover to block egg-laying, companion flowers that draw predators, and crop rotation to break overwintering pest cycles.