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Poinsettia Problem Diagnostic Key - Symptoms / Cause

Plant Structure
Leaves
Bracts

Stems
Roots
Insects
Shipping Related Problems
Problems at the Consumer Level
Leaf Edges Yellow and Necrotic
Yellow and Necrotic Leaf Spots
Uniform Yellowing
Leaf Discoloration, Chlorosis
Black Fuzzy Spots on Leaves
Leaf Deformation
Puckering of Leaves
Drooping Leaves
Leaf Loss

 
Young leaves: chlorosis and stunting of new developing leaves (Zinc deficiency)
Young leaves: chlorosis, with leaves becoming distorted or cupped (Copper deficiency)
Young leaves: chlorotic with green veins (Iron deficiency)
Upper mature leaves: a mottled yellow which becomes chlorotic (Manganese deficiency)
Medium to older leaves: chlorosis of interveinal areas, progressing to necrosis of the leaf margins (Potassium deficiency)
Medium to older leaves: interveinal chlorosis with green veins (Magnesium deficiency)
Upper foliage: interveinal V-shaped chlorosis with green veins, and downward cupping of the young leaves (Ammonium-nitrogen toxicity)
Too much water if leaves roll upwards (Irrigation)
Too high EC levels

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