Capsid Bugs: Ragged Holes in Young Leaves

Small brown-edged holes in the newest leaves, which tear wider as the leaf grows, are the classic sign of capsid bugs. They are quick, pale green insects that suck sap from shoot tips. The damage looks dramatic, but plants nearly always shrug it off.

This guide helps you confirm it is capsid and not something else, and decide whether it is worth doing anything at all.

Peppered, brown-edged holes on the youngest leaves are the giveaway. The bug itself is rarely this easy to spot.

What does capsid bug damage look like?

Look for lots of tiny holes in the leaves at the shoot tips, each with a brown edge. As the leaf grows, the holes stretch into ragged tears and the leaf puckers.

The bug feeds by injecting saliva that kills a speck of tissue around each bite. That dead spot cannot grow with the rest of the leaf, so it splits open. This is why the damage often looks worse a week or two after the bugs have left.

What you see depends on the plant:

• Dahlias, fuchsias and chrysanthemums: tattered tip leaves and flower buds that open lopsided, with missing or damaged petals, or don’t open at all.
• Apples: holed leaves in spring, then raised bumps and corky patches on the fruit. The apples are still fine to eat.
• Currants and gooseberries: ragged, puckered leaves on new shoots.
• Roses, hydrangeas, beans and potatoes can also be hit.

A lopsided dahlia with notched petals is a typical capsid result. Later flowers on the same plant often open perfectly.

How to identify a capsid bug

Capsid bugs are pale green, up to about 6mm long, with long legs and antennae. Young ones (nymphs) look similar but have no wings. They are shy and fast, dropping off the leaf or scurrying round to the underside when disturbed.

The common green capsid causes most garden damage. The apple capsid sticks mainly to apples, and the tarnished plant bug is a browner relative that also feeds on border plants.

Two lookalikes are worth ruling out. The green shield bug is broader, flatter and shield-shaped, and rarely does much harm. Aphids sit still in visible clusters and leave sticky honeydew rather than holes.

Turn a leaf over and you may catch one. Long legs and antennae and a quick getaway are typical.

When are capsid bugs active?

Capsids feed from late April to late August. The common green capsid spends winter as eggs tucked into the bark of woody plants such as currants and apples.

The eggs hatch in spring and the young bugs feed on the new shoots. In summer many move to soft border plants like dahlias and fuchsias, where a second generation grows up. In autumn the adults return to woody plants to lay eggs for next year.

This is why fruit bushes get holed leaves in spring, and border plants get spoiled flowers in mid to late summer.

How to deal with capsid bugs

For most gardens, the best response is to relax. Damage is mostly cosmetic and plants recover. Here is what genuinely helps:

• Tolerate light damage. Later leaves and flowers usually come through clean.
• Check before you act. Damage shows up after feeding, so the bugs have often moved on by the time you notice.
• Tap and catch. Hold white card under a shoot and tap it on a cool morning. Bugs that drop show up clearly and can be removed.
• Welcome predators. Birds, ladybirds, lacewings and predatory bugs all eat capsids. A mix of plants and no needless spraying keeps them around.
• Tidy in winter. Clear weeds and plant debris around plants that are badly hit every year.

If a prized plant is damaged badly every season, you can use an approved insecticide for that plant and pest, following the label. Apply it as soon as fresh damage appears. Never spray open flowers or fruit blossom, as it can harm bees.

Tapping a shoot over white card on a cool morning shows whether capsids are still about.

Common mistakes with capsid bugs

Spraying after the damage appears. The holes show up after feeding, so a spray then often hits nothing. Check for live bugs first.

Mistaking them for aphids. Aphid treatments and tactics don’t fit capsids. Look for dry holes rather than sticky leaves and visible colonies.

Spraying flowers. Even approved insecticides can harm bees and other pollinators. Keep sprays off open flowers and fruit blossom.

Giving up on the plant. Capsid damage looks alarming, but plants grow out of it. Keep feeding and watering as normal.

Frequently asked questions

What does capsid bug damage look like?

Lots of small holes with brown edges in young shoot-tip leaves. As the leaf grows the holes stretch and tear, so the leaf looks tattered and puckered. Flower buds may open lopsided or not at all.

How do I get rid of capsid bugs naturally?

Mostly, you don’t need to. Tolerate light damage, let birds and predatory insects do their work, and tap shoots over white card to catch bugs you spot. Clear weeds and plant debris around badly hit plants in winter.

When are capsid bugs active in the UK?

From late April to late August. Eggs laid on woody plants hatch in spring. Some of the young bugs move on to soft border plants in summer, where a second generation feeds.

Will capsid bugs kill my plants?

No, capsid bugs very rarely kill a plant. The damage is mostly cosmetic. Flowers on dahlias and fuchsias suffer most, and apples can get corky bumps but are still fine to eat.

What is the difference between capsid and aphid damage?

Capsid damage is dry, ragged holes; aphid damage is curling with sticky honeydew. Aphids sit in clusters you can see. Capsids are usually gone or scurry off fast.

Should I spray for capsid bugs?

Usually not. By the time you see damage the bugs have often moved on. If a plant is badly hit every year, an approved insecticide for that plant can be used early, following the label and never on open flowers.

For more pests and their fixes, browse the problems hub. Keep your dahlias flowering well all summer with our guide to growing dahlias, and see how to grow fuchsias for plants that bounce back after a bad patch. For a wider approach to pests without sprays, read our organic pest control guide.