Leaf scorch is a widespread noninfectious disease or disorder that may occur on any species of tree or shrub. Woody plants commonly affected in Illinois are listed in Table 1. Scorch is most common follow-ing prolonged periods of dry, windy weather or bright sunshine when the roots are unable to supply water to the foliage as rapidly as it is lost through the leaves by transpiration. Injury also is most common where plants are growing in an unfavorable location, such as in sandy or gravelly soil, near obstructions or pavement that restricts the area for root growth, or on an exposed windy slope. In fact, leaf scorch may occur each year in such unfavorable locations, or when injury to a part of the root system is permanent and severe, reg

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