Rust Colored Hemlock Bark
Picture of a hemlock with rust colored bark. When I cut a nearby tree, also with rust colored bark, it was infested with HWA. Attached picture shows a Logrite ATV arch in use.
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Replies to This Discussion
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Permalink Reply by Lew Ward on
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Carl,
I've seen the rust colored bark on isolated Hemlock trees for decades, well before HWA showed up. I figured it was some environmental or soil born problem, no obvious signs. As I read this article, I recalled that the browning of the Hemlock was on drier sites. I think this article explains the conditions creating environmental stress. Environmental stress increases susceptable to a variety of environmental conditions. pathogens, and inset infestations. I also read a little in Diseases of Trees and Shrubs By Wayne Sinclair and Howard Lyon, an esential text for anyone growing woody plants. I noticed that Phytopthora can cause browning in some species.https://www.torontomastergardeners.ca/askagardener/browning-hemlock...
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