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Leaf Miners

Pest

Leaf miners are the larvae of various insects that tunnel inside the soft tissue of leaves. While they rarely kill a plant, their feeding creates unsightly trails that can reduce the plant's ability to photosynthesize effectively.

Leaf Miners on a plant
Photo: Steve Kerr, CC BY

Symptoms by part

Leaves

Look for winding, serpentine white or light brown trails that appear on the surface of the foliage. In some cases, these trails may widen into blotchy patches as the larvae grow.

Causes

  • Adult insects laying eggs on the undersides of leaves during the growing season.
  • Warm temperatures that accelerate the life cycle of the larvae.
  • Lack of natural predators like parasitic wasps in the immediate garden environment.

Could be confused with

  • Leaf spots · Fungal leaf spots are usually circular or irregular patches rather than long, winding tunnels.
  • Nutrient deficiency · Yellowing from nutrient issues typically affects the whole leaf or the area between veins, not specific winding paths.

Treatment

  1. 1. Pinch off and destroy individual leaves showing fresh tunnels to remove larvae before they mature.
  2. 2. Use a pin or needle to pierce the end of the tunnel where the larva is located to stop further feeding.
  3. 3. Apply spinosad to the foliage when you see adult activity, follow the label.

Without chemicals

  • Prune away heavily infested branches to reduce the population.
  • Cover susceptible plants with fine mesh netting during the peak egg laying period to prevent adults from reaching the leaves.
  • Encourage beneficial insects by planting diverse flowers that attract parasitic wasps.

Chemical options

  • Spinosad, spray the foliage thoroughly during the growing season, follow the label.

Preventing it

  • Keep plants healthy with proper watering and feeding to help them outgrow minor damage.
  • Clean up fallen leaves at the end of the season to remove overwintering pupae.
  • Use floating row covers on young or vulnerable plants early in the season.

Season

The warm growing season.

Spread risk

Moderate

Severity

Low

When to act

Act as soon as you notice the first winding trails on your leaves. If the infestation covers more than half of the foliage, remove the affected plant to prevent it from acting as a reservoir for the pests.

Think it's Leaf Miners?

This guide covers the general picture. Pocket Botanist looks at your actual plant from a photo and tells you what's really going on, how serious it is, and what to try first. Identification and a health check are free.

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Questions people ask

Will leaf miners kill my plant?
Usually no. Most plants can tolerate the damage, though it looks messy and can weaken the plant if the infestation is severe.
Can I just spray the leaves with water to get rid of them?
No, because the larvae are protected inside the leaf tissue, water sprays will not reach them.
Do I need to remove the whole plant?
Only if the infestation is so heavy that the plant is no longer growing well or looks completely ruined.

Plants it affects

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This guide was generated with AI and is general information, not horticultural advice. Read about how we build these guides.