There are many visual signs that can be used to distinguish if your plant has health problems or diseases

By Leaf appearance

Fan leaf colour

The color and general appearance of fan leaves can provide a lot of information about issues involving nutrients

File:Leaf colour nutrients.jpg


"burned" leaf apex

The fan leaves will also show signs of any nutrient burn taking place. Nutrient burn symptoms occur at the tip of fan leaf "fingers" (the apex) where the leaf turns brown and crispy

Wilted leaves

Claw fan leaves

By plant appearance

loss of stem rigidity

Purple stems