| AFFECTING LEAVES: |
|
CONDITION
|
CAUSE
|
 |
Yellow
leaves, older first; stunted plants |
Nitrogen deficiency
|
|
Yellow,
curled leaves; stunted plants |
Aphids
|
|
Purplish
patches on leaves |
Phosphorus deficiency
|
|
Brown
leaf tips |
May be a reaction to
bright sun and heat (temperatures above 80° F.)
|
|
Tan
spots with dark borders |
Cercospora leaf spot
(Cercospora spp.)
|
|
Yellow,
rotted leaves; light-colored spots on upper leaf surface, white mildew
on leaf undersides |
Downy mildew (Peronospora
effusa)
|
|
Stunted,
crinkled leaves |
Curly top
|
|
White or
translucent, irregular tunnels in leaves |
Leafminers
|
|
Small
holes, shot-hole injury |
Flea beetles (Phyllotreta
spp.)
|
|
Chewed
terminals and leaves |
Beet armyworm (Euxoa
auxiliaris)
|
