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Lettuce

Pests and their Damage—Planting to Rosette (Central Coast)

On this page
  • Green peach aphids
  • Springtails
  • Leafminers
  • Garden symphylans
  • Corky root
  • Lettuce dieback
  • Fusarium wilt
  • Ammonium toxicity
  • Tomato spotted wilt
  • Lettuce drop

See also, pests of other regions: Central Valley and Desert. Names link to more information on identification and management.

Click on photos to enlarge

Green peach aphids
Green peach aphids
Identification tip: Green peach aphids are dark green to yellow and have no waxy covering.

Springtails
Springtails
Identification tip: Less than about 1/8 inch long, wingless, and with a forked appendage at the tip of the abdomen used for springing into the air.

Leafminer damage
Leafminer damage
Identification tip: Larvae mine between upper and lower leaf surfaces, creating winding, whitish tunnel.

Garden symphylans
Symphylans
Identification tip: Less than 1/3-inch long, with 15 body segments, and 11 to 12 pairs of legs. Slender, elongated, and white with prominent antennae.

Corky root
Corky root damage
Identification tip: Young corky root infected lettuce plant showing banding of green to tan areas on tap and lateral roots.

Lettuce dieback
Lettuce dieback
Identification tip: Outermost leaves are extensively yellowed. Younger, inner leaves often remain dark green in color, but can be rough and leathery.

Ammonia toxicity
Ammonium toxicity
Identification tip: Discolored vascular tissue caused by ammonium toxicity.

No photo available.

Fusarium wilt
Identification tip: Leaves turn yellow and develop tipburn. The vascular system is brown to black in the leaves and a reddish brown discoloration develops in the cortex of the crown and upper root. Plants may be stunted and fail to form heads.

Tomato spotted wilt virus
Tomato spotted wilt
Identification tip: Iceberg lettuce develops necrotic lesions on leaves.
Lettuce drop
Lettuce drop
Identification tip: Plant death with white mycelium and sclerotia at the base of the plant.
 

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