Tomato Leaf Miners: Identification and Integrated Management

Managing Tomato Leaf Miners for Healthier Plants

Those white, serpentine trails winding through tomato leaves are the signature of leaf miners (Liriomyza species)—fly larvae tunneling between leaf surfaces.

Life Cycle and Damage

Adult flies lay eggs on leaves. Larvae hatch and tunnel through mesophyll tissue, creating visible mines. Heavy infestations reduce photosynthetic capacity, but tomatoes tolerate moderate damage without yield loss.

Integrated Management Strategy

Cultural Controls

• Remove and destroy mined leaves regularly
• Fertilize consistently to promote new leaf growth
• Plant diverse flowers nearby to attract parasitic wasps (natural enemies)
• Rotate tomato planting locations annually

Chemical Control

• Spinosad (Captain Jack's Dead Bug Brew) targets adult flies
• Apply repeatedly per label during active periods
• Time applications for early morning or evening to protect pollinators
• Systemic insecticides are less effective due to leaf tissue protection

Perspective

Tomatoes compensate well for leaf miner damage. Focus on plant vigor—healthy, rapidly growing plants outpace the injury. The mines look worse than the actual impact on yield.

Characteristic serpentine mines on tomato foliage

Larva visible within leaf mine