Sycamore, Plane Tree
Symptom Cause  
Irregular tan or brown spots on leaves at veins; expand until leaves die; sometimes sunken spots on leaves
Anthracnose (on plants)
Many holes in branches; limbs girdled sawdust at holes
Fewer; smaller leaves; blue/black stains under the bark
Canker Stain (fungus)
Young portions of foliage disappear, or young tips disappear; shredded bark on trunk
Leaves turn pale; mottled; drop early
Bumps on leaves; branches; stunted growth
Scale Insects