| AFFECTING LEAVES: |
|
CONDITION
|
CAUSE
|
 |
Yellow
leaves, older first; stunted plants |
Nitrogen deficiency
|
|
Yellow,
curled leaves; stunted plants. |
Aphids
|
|
Purplish
patches on leaves |
Phosphorus deficiency (common in cool spring soils)
|
|
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.)
|
|
Meandering,
white or translucent, irregular tunnels in leaves |
Leafminers
|
|
Small
holes, shot-hole injury |
Flea beetles (Phyllotreta
spp.)
|
|
| AFFECTING ROOTS: |
|
CONDITION
|
CAUSE
|
|
Internal
black, dead, hard spots |
Boron deficiency
|
|
Forked
roots |
Calcium deficiency
|
|
Small,
poorly developed roots |
Nitrogen deficiency
|
|
Light
color and wider zoning of rings in root |
High temperature and
fluctuating soil moisture
|
