Hemlock Woolly Adelgid Infestation

Here are three close-up photos showing the progression of an infestation of the invasive insect hemlock woolly adelgid. The first photo shows a lightly infested hemlock branch with two of the small fluffy

ovisacs (egg-sacs). This is when we ideally like to catch an infestation for treatment! The second photo shows a heavily infested branch, covered with white woolly ovisacs at the base of almost every needle. The third photo shows the end stages of damage, with a lot of needle loss and die-back. If there is enough damage to the entire tree, the tree may or may not survive at this stage even with treatment. HWA can kill a hemlock tree in 4-10 years, depending on the initial health of the tree. Contact our crew for more information and/or a free winter HWA survey!

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