| AFFECTING ROOTS: |
|
CONDITION |
CAUSE |
 |
Roots
are riddled with slimy, winding tunnels |
Cabbage root maggots
|
|
| 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)
|
|
Large
hole in leaves; outer leaves riddled, excrement found at base of
cabbage head |
Cabbage worms (Pieris
rapae) or Cabbage looper
|
|
Small
holes, shothole injury |
Flea beetles (Phyllotreta
spp.)
|
|
| AFFECTING HEADS: |
|
CONDITION |
CAUSE |
|
Black
specks or spots on heads |
Downy mildew (Peronospora
effusa)
|
|
Curds
turn brown and appear watersoaked |
Boron deficiency or
exposure of curds to bright sun and high temperatures
|
