On June 18 I sent a byglalert about maple anthracnose diagnosed earlier this spring. The plant disease symptoms (see below) for that byglalert item included discolored blotches on the foliage which coalesced along leaf veins. The sample above for this alert today, sent from OSU Extension in Morrow County, show symptoms of leaf discoloration between the veins. This is the classic difference between physiological leaf scorch (this case) and anthracnose fungal disease (the previous case). The difference is all in the details. Physiological leaf scorch can be caused by many factors: from root problems and stem problems to drought stress.