Leaf Scorch Of maple

Disease Information

Leaf Scorch

Symptoms and damage

 On maple (Acer species) trees a number of problems cause symptoms that are generally classified as leaf scorch. Scorch symptoms are light brown or tan dead areas between leaf veins or around the leaf margins. Occasionally the leaf margins are yellow or chlorotic. Scorch symptoms tell us that one or more of the following factors are affecting the tree:

a)     Physiological leaf scorch is the most common. It is caused by dry weather, combined with wind and high temperatures. When trees do not get enough water they will scorch. The symptoms are on all parts of the tree or only on the side exposed to sun and wind. Scorching due to dry soil may be overcome by proper watering.

b)    A response to an undesirable soil contaminant, such as salt (applied to roads for wintertime ice control), accumulation of fluorides in containerized soil mixes with perlite, or high levels of phosphate fertilizers.

c)     A reaction to a vascular pathogen, either fungal or bacterial.


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