getting calls on this
Anthracnose is among the most common diseases seen on oak and maple. Although anthracnose usually causes little damage, severe disease outbreaks, characterized by blighting of leaves and defoliation, do occur. Damage severity on maple and oak depends on identity of the causal fungus, tree species, age of the leaves, and weather conditions. Generally, outbreaks of anthracnose are favored by warm temperatures and frequent showers. (source: aces.edu)