Sulfur deficient fern
Calcium deficient strelitzia
Thrips on viburnum
THICK, BRITTLE LEAVES
Cause and Notes: • These leaves are thicker than usual and break easily • Often caused by microscopic mites, especially in hot, dry weather • Thrips injury can also give you something similar, though you also often see leaf scarring or distortion with feeding of thrips • Lack of boron, calcium or sulfur can also be a cause
Examples: • Seen on gerberas, New Guinea impatiens and some maples
How to Correct: • Sprays with calcium nitrate, Harrell’s MAX® Calcium 8.25%, or chelated calcium • Treat mite infestations as usual • Apply deficient elements as needed
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