| AFFECTING LEAVES: |
|
CONDITION
|
CAUSE
|
 |
Yellow
v-shaped spots on leaf margins with blackened veins |
Black rot (Xanthomonas
campestris)
|
|
Yellowish
leaves, lower leaves drop; stunted plants may have twisted stems;
usually occurs soon after transplanting |
Fusarium yellows (Fusarium
oxysporum)
|
|
Yellow
leaves, older first; stunted plants |
Nitrogen deficiency
|
|
Yellow,
curled leaves; stunted plants |
Aphids
|
|
Purplish
patches on leaves |
Phosphorus deficiency in cool soils
|
|
Small
leaf holes |
Flea beetles (Phyllotreta
spp.)
|
|
Large
leaf holes |
Cabbage Loopers or Imported Cabbage
Worms (Pieris rapae)
|
|
| AFFECTING ROOTS: |
|
CONDITION
|
CAUSE
|
|
Yellow,
stunted plants that wilt during bright, hot days and recover at night |
Root injury. Check
for root maggots.
|
|
Small,
imperfectly formed roots |
Nitrogen deficiency
|
|
Poor
root development |
Phosphorus deficiency
|
|
White
spots or streaks internally; large air spaces and tough, dry roots |
High temperature
injury
|
|
Soft,
shriveled roots |
Freezing injury
|
