Cultural Problems
Leaf deformation on poinsettia
Various types of leaf deformation may occur on poinsettia. Often, the damage begins when the leaves are very small. As plants grow, the mature leaves cover the damaged young leaves, so plants are still marketable.
Branches that develop after pinching may develop a few distorted and misshapen leaves. Environmental stresses, overhead fertilization and phosphorus fertilizers, or abrasion may lead to distorted leaves. Changes in temperature and humidity as plants are moved from propagation to finishing houses also lead to leaf distortion. It is thought that rapid changes in humidity cause an accumulation of salts along the leaf margins and veins that result in leaf injury. In this photo, very warm temperatures in early August may have contributed to the distorted leaves.
Thrips feeding can also cause distorted leaves, however, with thrips feeding, you will see white scarring. See photo: Thrips feeding damage on poinsettia in pest section of gallery.
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