| AFFECTING LEAVES: |
|
CONDITION
|
CAUSE
|
 |
Tan to
dark-brown leaf margins |
Heat injury
|
|
Poor
sprout development |
Nitrogen or potassium
deficiency; poor variety choice
|
|
Sticky,
blackened sprouts |
Aphids
|
|
Holes in
leaves |
Imported cabbage worm
(Pieris rapae) or Cabbage looper
|
|
| AFFECTING ROOTS: |
|
CONDITION
|
CAUSE
|
|
Yellow,
stunted plants that wilt during bright, hot days and recover at night. |
Usually a sign of
root injury. Pull up plant and check for root-knot nematodes or cabbage
root maggots (below)
|
|
Irregularly
shaped galls |
Root-knot nematode
(Meloidogyne spp.)
|
|
Roots
are riddled with slimy, winding tunnels |
Cabbage root maggots
|
