They're just sick. Sycamores suffered severe leaf wilting and loss this year from the cool, humid spring that triggered severe fungus growth. Most recovered by midsummer. Shock, whose grandfather founded Warren-based Shock Brothers Tree Service, oversees 15,000 trees on city property. Knowing the difference means saving those species that will recover.
Red oaks are highly susceptible.
Oak wilt can kill a large one in as little as a month. The white oak is much less susceptible, Jasso said.