Lawn and Landscape quotes Davey's Rex Bastian on a variety of tree diseases.
Posted: Monday, February 10, 2014
By Stacie Zinn Roberts
It seems weather, more than any other factor, ushers in pests and diseases that leave trees vulnerable to infection.
In Denver, where temperatures may swing by as much as 50 to 70 degrees in one day, tree diseases usually “aren’t a huge thing,” says Steve Geist, senior consulting arborist with Swingle Lawn, Tree & Landscape in Denver. But in 2012, Denver saw an unusually hot spring.
“In 2012, we ran into an uptick of Pine Wilt Disease,” Geist says. The disease is caused by the Pine Wood Nematode, a microscopic, wormlike animal. “Pine Wilt is the only tree disease caused by an animal,” he says.
“It’s very peculiar and difficult to work with,” Geist says. “It’s a major pest in the Midwest: Illinois, Missouri, Central and Eastern Nebraska, and Kansas has got quite a bit of it. It gets going a lot faster if you have a hot spring, which we did in 2012. We were running into quite a few deaths of Austrian and Scots pine, exotic pines that aren’t native."
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