Check for stand uniformity and wilted
plants and inspect plants for pests and pest or abiotic damage. Names
link to more information on identification and management.
Click on photos to enlarge
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Green peach aphids
Identification tip: Green peach aphids are
dark green to yellow and have no waxy covering.
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Beet armyworm
Identification tip: Larva feeds in the crown area
of a young lettuce plant (in August/September plantings).
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Cutworms
Identification tip: Larvae frequently roll into
a C-shape when disturbed. |
Seedcorn maggot
Identification tip: Larvae range from 1/5 to 1/4
of an inch in length, are white to whitish yellow, cylindrical,
and taper anteriorly.
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Silverleaf whiteflies
Identification tip: Adults are tiny (less than 1/10 inch),
yellowish insects with white wings. (in Aug/Sept. plantings) |
No photo available.
Damping-off (Rhizoctonia
diseases)
Identification tip: Infected seedlings exhibit decayed roots and brown lesions on stems. When
seedlings are infected, the stem tissue collapses and plants fall over and die. |
Lettuce dieback
Identification tip: Outermost leaves are extensively
yellowed. Younger, inner leaves often remain dark green in
color, but can be rough and leathery.
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Lettuce drop
Identification tip: Plant death with white mycelium
and sclerotia at the base of plant.
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Corky root damage
Identification tip: Young corky root infected lettuce
plant showing banding of green to tan areas on tap and lateral
roots.
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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. |
Herbicide damage
Identification tip: Pronamide herbicide damage to seedlings
causes yellow leaf margins.
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Herbicide damage
Identification tip: Alachlor herbicide injury can result in curling
and stunting of leaves.
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Ammonium toxicity
Identification tip: Discolored vascular tissue caused
by ammonium toxicity.
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