Potassium deficient heliconia
Potassium deficient aralia
Potassium deficient rhapis
SMALL BROWN SPOTS IN OLDER LEAVES
Cause and Notes: • Spots on newer and middle leaves may be fungal or bacterial disease • Plants in a block will tend to be affected, while others may not • Evenly distributed spots in older leaves may be K deficiency • K deficiency means stomates do not close properly, leading to localized desiccation and tiny brown spots in older leaves
Examples: • These symptoms are often seen on palms, maples and rhododendrons
How to Correct: • Spray with potassium nitrate, such as Harrell’s MAX® Potassium plus Calcium, or a top dress with K-Mag will often stop the progression of the symptom, but it won’t cure existing spots
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