David Cook, UT agriculture extension agent for Davidson County TN, explains the nonnative scale that poses a serious threat to Southern Crape Myrtles. The nymphs produce a large amount of honeydew that drips down the trunk, branches, leaves, and ground below. That substance then accumulates sooty mold. While not fatal, it makes the infested trees an eyesore in the landscape. To WATCH full episodes, visit http://www.volunteergardener.org