Names link to information on
identification and management.
Click
on photos to enlarge
Green
peach aphid
Identification tip: Small, pale green insects, usually
found on lower leaves of plants; winged adults have black
patches on their backs.
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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.
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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.
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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.
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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.
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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.
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Flea beetles
Identification tip: Nnumerous small holes in leaves; small
brown or black beetles that jump readily when disturbed.
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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.
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Late
blight
Identification tip: "Greasy" dark, water-soaked
lesions on foliage and stems; white fungal sporulation may
be present.
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Early
blight
Identification tip: "Target spot" lesions; angular
or round patches with concentric rings of dark brown or black,
often with yellow margins.
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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.
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