Dealing with Slugs, Snails, Aphids, and Other Pests on Rhubarb

Rhubarb is tough and generally pest-resistant—but when pests strike, they can leave your stalks riddled, your leaves ragged, and sometimes, transmit disease. With a few smart prevention strategies and non-toxic control methods, you can keep slugs, snails, aphids, and other pests at bay and enjoy healthy, robust rhubarb all season.

Most Common Rhubarb Pests

Slugs & Snails

• What they do:
  • Chew holes in emerging leaves and stalks, especially in damp springs and with heavy mulch.
• Prevention & Control:
  • Hand-pick at dusk or dawn.
  • Use beer traps, copper tape, or grit barriers around crowns.
  • Avoid heavy mulching right up to the base of plants—keep mulch a few inches away from the crown.

Aphids

• What they do:
  • Cluster on leaf undersides and flower stalks, sucking sap and sometimes transmitting viruses.
• Prevention & Control:
  • Hose off with a strong jet of water.
  • Encourage beneficial insects (ladybirds, lacewings) by companion planting with herbs and flowers nearby.
  • Spray with diluted insecticidal soap or neem oil if infestation is severe (avoid spraying edible stalks directly).

Vine Weevil (larvae)

• What they do:
  • Larvae feed on roots, stunting growth or causing collapse, especially in container rhubarb.
• Prevention & Control:
  • Apply nematodes in late summer and autumn.
  • Repot infested containers, removing all grubs from roots.

Leafhoppers and Flea Beetles

• What they do:
  • Small holes, stippling, or “shot-hole” effect in leaves.
• Prevention & Control:
  • Keep beds weed-free; use sticky traps as an early-season indicator.
  • Most minor infestations don’t harm rhubarb’s main crop.

Root-knot Nematodes

• What they do:
  • Rare in rhubarb, but can cause root galls and dwarf plants.
• Prevention & Control:
  • Rotate crops.
  • Mulch and feed to keep plants vigorous enough to outgrow minor infestations.

General Pest-Prevention Tips

• Keep beds tidy: Remove old leaves, dead stalks, and debris regularly.
• Water in early day: Damp leaves overnight attract more slugs/snails.
• Plant companions: Borage, alliums, and chives can deter aphids and beetles.
• Don’t over-fertilize with nitrogen: Lush, tender growth is more pest-attractive and vulnerable.

When to Worry and What to Do

• Minor holes in leaves seldom affect crop.
• Severe infestations (wilt, collapse, no new growth) require action—remove infected plants, treat soil, or replant in a new area.
• Avoid pesticides unless organic strategies fail; rhubarb is rarely affected enough to justify harsh measures.

Wrapping Up

Most rhubarb pests are manageable with smart, regular garden hygiene and gentle intervention. Encourage natural predators, keep an eye out for early signs, and don’t panic over a chewed leaf—the plant is tougher than it looks.