This news item expired on Saturday, November 30, 2013 so the information below could be outdated or incorrect.
If you have hemlock trees, inspect them for signs of hemlock woolly adelgids. This is a good time of year to treat smaller trees with insecticidal soap or horticultural oil.
Fall is also a good time to apply a systemic soil drench treatment on larger trees. For more information, see Recommendations for Hemlock Woolly Adelgid Control in the Landscape.