symptom |
possible
cause |
chlorosis |
|
entire plant |
nitrogen deficiency; high
light |
young leaves |
poor soil aeration; salinity;
iron or sulfur deficiency; |
older leaves |
nitrogen or magnesium deficiency;
overwatering; poor soil areation |
leaf margins |
salinity; magnesium deficiency |
intervenal |
iron or manganese deficiency |
irregular spots |
cold temperature |
necrosis |
|
water-soaked
areas |
cold temperature |
tips or margins
(old) |
potassium deficiency (old
leaves); boron toxicity (old leaves); salinity;
temperature extremes; desiccation; low humidity;
root damage |
center of leaf |
sun-scorch; cold; nutrient
toxicity; ethulene toxicity (poorly or unvented
greenhouses) |
leaf deformation |
|
leaves abnormally
small |
micronutrient defiency;
salinity; high light; root-bound or damaged
plants |
petioles elongated |
low light |
holes in leaves |
mechanical injury; slugs;
snails; insects |
new leaves stunted |
manganese or other micronutrient
deficiency; salinity; poor aeration; overwatering |
stem deformities |
|
rot at soil
line |
salinity; fertilizer placed
against stem; overwatering; poor aeration |
wilting |
salinity; high temperature;
desiccation; low humidity; low soil moisture;
root damage |
thin, spindly, weak |
low light;
crowding of plants |
root abnormalities |
|
slow development |
salinity; soil temperature
extremes; plant too deep; poor aeration; overwatering |
poor / rotted roots |
salinity; overwatering;
poor aeration |
stunted plants |
fertilizer extremes; nutrient
deficiency; extremes of light; overwatering;
poor aeration; poor roots |
