With most places in Ontario well below normal rainfall amounts for July, lack of water one of many potential causes.

Birch and maple are also exceptions, because they bleed sap if pruned in late winter, which doesn’t harm the trees, but results in unsightly sap running down the trunks.

Pecan, walnut, American elm, hickory, fruit trees and some maples are preferred hosts. Ornamentals such as birch, lilac, crabapple, cherry, and redbud are also common hosts.

SIOUX FALLS, S.D. (KELO) – A wet spring and three years of summer drought has created “the perfect storm” for dull fall colors and premature dead trees this season. John Ball, a professor ...