| AFFECTING LEAVES: |
|
CONDITION
|
CAUSE
|
 |
Yellow,
curling leaf margins, wilted plants; flowers and pods drop |
Potato leaf hoppers
|
|
Yellow,
distorted new growth |
Tarnished plant bug
(Lygus pratensis)
|
|
Yellow
leaves, slow growth |
Nitrogen deficiency
|
|
Yellow,
withered, thickened and curled leaves; flowers may drop |
Pea aphids
|
|
Yellow
crinkled, mottled, curled leaves |
Mosaic virus
|
|
Mottled,
yellow, crumpled leaves; rosetting |
Pea enation virus
|
|
Yellow
leaves, stems yellow inside; dwarfing and wilting |
Fusarium wilt (Fusarium
oxysporum)
|
|
Velvety,
white growth on leaves |
Downy Mildew (Peronospora
effusa)
|
|
Powdery,
white leaf spots |
Powdery mildew
|
|
White
stippled leaves which later become bronzed |
Mites
|
|
White or
translucent, irregular tunnels in leaves |
Leafminers
|
|
Leaf
holes on young plants |
Striped and spotted Cucumber beetles (Acalymma
vittata)
|
|
Large
holes in leaves |
Armyworms (Euxoa
auxiliaris)
|
|
| AFFECTING SEED, SEEDLING, OR ROOT: |
|
CONDITION
|
CAUSE
|
|
Seedlings
clipped off at soil line |
Cutworms (Noctuidae
spp.)
|
|
Stems
rot near soil line and plant collapses; seeds do not germinate |
Damping off
|
|
Poor
germination, damaged seedling stem; deformed, spindly seedlings |
Seed corn maggots
|
|
| AFFECTING PODS: |
|
CONDITION
|
CAUSE
|
|
Blossoms
drop |
Excessive heat or
rain
|
|
Blossoms
drop or pods fail to develop |
Copper and/or
molybdenum deficiency
|
|
Brown
spot or cavity on seeds |
Manganese deficiency
|
|
White,
powdery spots on pods |
Powdery mildew
|
|
Holes in
blossoms, tunnels in seeds |
Pea weevil adults
|
