| AFFECTING LEAVES AND STALK: |
|
CONDITION
|
CAUSE
|
 |
Yellow,
dwarfed young leaves, bushy growth, purpled leaves |
Aster yellows (Phytoplasma)
|
|
Yellow
leaves, older first; stunted plants |
Nitrogen deficiency
|
|
Yellow
leaves, reddish stalks |
Fusarium yellows (Fusarium
oxysporum)
|
|
Yellow,
curled leaves |
Aphids
|
|
Yellow,
distorted new growth |
Tarnished plant bug
(Lygus pratensis)
|
|
Mottled,
yellow leaves, twisted stems, dwarfing |
Celery mosaic
|
|
Brown
mottling of leaves, cross-wise cracks on stalks |
Boron deficiency
|
|
Discolored
streaks on stalk |
Potassium deficiency
|
|
Rosetting
of leaves |
Phosphorus deficiency
|
|
Blackening
at center with death of growing points |
Calcium deficiency
|
|
Irregular
yellow-brown leaf spots; sunken tan, elongated spots on stalks |
Cercospora leaf blight
(Cercospora spp.)
|
|
Dwarfed,
rotted plants |
Carrot rust fly (Psila
rosae)
|
|
Chewed
leaves |
Several worms
including carrot (or celery) worm, Armyworm (Euxoa
auxiliaris) , or Cabbage
loopers
|
