Check for stand uniformity and wilted
plants and inspect plants for pests and pest 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.
|
Armyworm
Identification tip: Armyworm larvae are variable in color but are usually dark green or gray, with three thick stripes running down each side.
|
Looper damage
Identification tip: Larvae feed primarily on the
undersides of lower leaves, skeletonizing them and contaminating
them with frass. |
Corn earworm damage
Identification tip: As larvae mature they develop
distinct stripes, but the overall color is variable.
|
Leafminer damage
Identification tip: Larvae mine between upper and
lower leaf surfaces, creating winding, whitish tunnel.
|
Green peach aphids
Identification tip: Green peach aphids are dark
green to yellow and have no waxy covering.
|
Anthracnose damage
Identification tip: Small, water-soaked spots (less
than 3 mm) on outer leaves eventually enlarge, turn yellow,
and become irregular and angular in shape.
|
Lettuce
drop
Identification tip: Older leaves wilt; eventually
the entire plant wilts and collapses, making it unharvestable.
|
Corky root damage
Identification tip: Roots show reduced feeder roots
and a rough, pitted taproot.
|
Tomato spotted wilt
Identification tip: Iceberg lettuce develops necrotic
lesions on leaves. |
Ammonium toxicity
Identification tip: Discolored vascular tissue caused
by ammonium toxicity. |
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. |
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. |
Downy mildew damage
Identification tip: Light green to yellow angular
spots develop on the upper surface of the leaf. |
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. |
