Cabbage, Chinese
Symptom Cause  
Small, yellow spots, old leaves; spots enlarge, black growth
Alternaria Leaf Spot
>
Leaves wrinkled or curled; discolored, stunted, tend to fall off
Aphids
>
Ash gray spots speckled with tiny black spots on leaves and stems. Stems become girdled, wilt and die. Moist conditions favor this disease.
Black Leg
>
Young plant yellows, browns, dies; lower leaves wilt, die
Black Rot
>
Holes in leaves
Cabbage Loopers
>
Young plant severed at soil
Cutworms
>
Small holes on older leaves; growing tip chewed out on young plants causing stunting; small caterpillars wiggle frantically when disturbed. Body wide in middle tapered at both ends.
Diamondback Moth Caterpillar
>
White powder on leaf undersides; foliage wilts
Downy Mildew
>
White butterflies; ragged holes in leaves, bit of green excrement on leaves
Imported Cabbageworms
>
Plant chewed to soil
Rabbits
>
Water-soaked area on stem near soil; extends upward;
Watery Soft Rot
>
Plant chewed to soil
Woodchucks
>