SYMPTOMS POSSIBLE CAUSES CONTROLS & COMMENTS
Cracking of cabbage -Excess water taken -Harvest heads as soon as
heads up by plant causes mature
head to burst -Overwatering
-Variety -Plant recommended varieties
Poor heading -Overcrowding -Thin plants early
-Dry soil -Supply water
-High temperatures
-Poor fertility -Soil test
-Root knot (nematode -Check roots for knots;
problem) rotate; soil fumigation
-Root rot (fungal -Rotate; remove old plant
disease) debris; plant in well-
drained soil
Discolored cauli- -Exposure to sun -Tie leaves over head when flower heads heads begin to form
Brown spots on -Alternaria Leaf Spot -Apply registered fungicide leaves (fungus)
V-shaped lesions on -Blackrot(bacteria -Apply registered bacteri- leaf margin cide; resistant varieties
Plants wilt and turn -Blackleg (fungal -Use western grown hot-
yellow; roots are disease) water-treated seed; rotate
discolored and poorly -Wirestem (fungal remove old plant debris
developed; roots may disease) -Work in a registered soil
be hard and brittle -Cabbage maggot insecticide at planting
time
Gray, powdery growth -Downy mildew -Use registered fungicide on lower leaf margin
Plants stunted and -Dry soil -Supply water
yellowed (esp. -Poor fertility -Soil test
cabbage cabbage -Fusarium yellows -Resistant varieties;
roots not discolored (fungal disease) rotate
-Cabbage maggot -Work in a soil insecticide
at planting time
Heads soft and rotted -Soft rot of cabbage, -Rotate; plant in well
broccoli, mustard drained soil
(bacterial disease)
Rough, brown, raised -Oedema, physiological -Maintain adequate soil areas on undersurface problem due to uneven moisture of leaves water supply
Leaves riddled with -Flea beetles -Use registered insecticide shotholes
Leaves chewed -Imported cabbage- -Identify insect; use regis-
worm, cabbage looper, tered insecticide
diamondback moth,
flea beetle
Some leaves curled -Aphids -Use registered insecticide and yellowed; -Harlequin bugs shriveled or
deformed plants
Bolting -Physiological -Plant at right time
disorder -Recommended varieties
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