| AFFECTING LEAVES AND HEADS: |
|
CONDITION |
CAUSE |
 |
Yellow
V-shaped spots on leaf marginsheads dwarfed and often one-sided |
Black rot (Xanthomonas
campestris)
|
|
Stunted,
wilted, yellow plants. Youngest plants and seedlings are affected |
Root maggots
|
|
Yellowish
leaves, lower leaves drop; stunted plants may have twisted stems,
usually occurs soon after transplanting |
Fusarium yellows (Fusarium
oxysporum)
|
|
Purple
leaves on transplants |
Usually indicates a
Phosphorus Deficiency
|
|
Older
leaves yellow, shrunken stems, dark near soil line; weak plants may
wilt and die |
Rhizoctonia (Rhizoctonia
spp.)
|
|
Black
specks to larger spots on heads |
Downy mildew (Peronospora
effusa
|
|
Brown
leaf tips |
May be a reaction to
bright sun and heat (temperatures above 80° F.)
|
|
Split
heads |
Too much water
|
|
| AFFECTING LEAVES: |
|
CONDITION |
CAUSE |
|
Small
holes, shothole injury |
Flea beetles (Phyllotreta
spp.)
|
|
Large
hole in leaves; outer leaves riddled, excrement found at base of
cabbage head |
Cabbage worms (Pieris
rapae)
or Cabbage looper
|
