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Potato

Pests of Foliage

On this page
  • Green peach aphid
  • Potato aphid
  • Potato tuberworm
  • Silverleaf whitefly
  • Potato psyllid
  • Cutworms and loopers
  • Flea beetles
  • Late blight
  • Early blight
  • Blackleg
  • White mold

Names link to information on identification and management.

Click on photos to enlarge

Green peach aphid
Green peach aphid
Identification tip: Small, pale green insects, usually found on lower leaves of plants; winged adults have black patches on their backs.

Potato aphid
Potato aphid
Identification tip: Larger than green peach aphids, usually scattered throughout infested plants; both green and pink forms occur on potato; winged adults do not have black markings on their back.

Potato tuberworm
Potato tuberworm
Identification tip: Grayish caterpillars with brown heads; feed inside leaf mines, mines in stems, or folded leaflets; look for wilted or dead foliage at stem tips or brown leaflets tied into shelters.

Silverleaf whitefly
Silverleaf whitefly
Identification tip: Tiny yellow flies with white wings; fly readily when disturbed; nymphs flattened, disc shaped, relatively immobile; adults and nymphs (shown here) on undersides of leaves.

Potato psyllid
Potato psyllid
Identification tip: Look for oval, flattened nymphs on undersides of leaves when adults are found in sticky traps. Adults mostly black with broad white band in first abdominal segment; clear wings that rest rooflike over the body; jump readily when disturbed.

Cutworms
Cutworms and loopers
Identification tip: Holes chewed in leaves; stems of young plants chewed through; look for larvae in foliage or on soil around base of plant.

Flea beetles
Flea beetles
Identification tip: Nnumerous small holes in leaves; small brown or black beetles that jump readily when disturbed.

Blackleg
Blackleg
Identification tip: Plants stunted with stiff, erect growth habit; foliage chlorotic, leaflets roll upward at the margins; stems usually but not always black; stem vascular tissue grayish black, base of stem often completely rotted; plants may wilt.

Late blight
Late blight
Identification tip: "Greasy" dark, water-soaked lesions on foliage and stems; white fungal sporulation may be present.

Early blight
Early blight
Identification tip: "Target spot" lesions; angular or round patches with concentric rings of dark brown or black, often with yellow margins.

White mold
White mold
Identification tip: Water-soaked stem lesions; fluffy white fungal mycelium on leaves and stems; irregularly-shaped, black sclerotia on or inside dying stems.

 


Statewide IPM Program, Agriculture and Natural Resources, University of California
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