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
Beet armyworm larvae
Identification tip: Newly hatched larvae are small,
green worms that often feed in groups.
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Armyworm
Identification tip: Larvae are variable in color
but are usually dark green or gray, with three thick stripes
running down each side.
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Looper damage
Identification tip: Larvae feed primarily on the undersides
of lower leaves, skeletonizing them and contaminating them
with frass.
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Corn earworm damage
Identification tip: As larvae mature they develop
distinct stripes, but the overall color is variable.
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Leafminer damage
Identification tip: Larvae mine between upper and
lower leaf surfaces, creating winding, whitish tunnel.
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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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Lettuce chlorosis damage
Identification tip: Symptoms of lettuce chlorosis
and lettuce infectious yellows are virtually identical.
Leaves exhibit severe yellowing, rolling, brittleness,
and vein-clearing.
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Downy mildew damage
Identification tip: Light green to yellow angular spots
develop on the upper surface of the leaf.
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Downy mildew damage
Identification tip: Underneath the leaf, immediately below these angular
spots, white fluffy fungal masses grow. With time lesions turn brown and dry
up.
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Lettuce drop
Identification tip: Older leaves wilt and eventually
the entire plant wilts and collapses, making it unharvestable.
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Big vein damage
Identification tip: Veins in leaves become enlarged
and clear; easily seen if leaf is examined with the light
source behind it. Enlarged veins cause the rest of the
leaf to be ruffled and malformed.
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Bottom rot (Rhizoctonia diseases)
Identification tip: Brown sunken lesions form on
midribs in contact with soil. Lesions may expand to rot
lower leaves.
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Corky root damage
Identification tip: Roots show reduced feeder
roots and a rough, pitted taproot. |
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. |
