Tree News

The flurry of storm activity over the past week has focused attention on big trees - especially the trees that have fallen. News outlets have produced a stream of reports mentioning the damage caused by tree failures. The AJC , WDUN , The West Georgian , WXIA , and WGCL , all ran mainstream stories just in the past few days. Because the drought is still in people's minds, it has become a catchall scapegoat for a number of tree-related problems. It is easy for people to grasp for a connection between drought stress and trees falling, but it is somewhat rash to do so without fully analyzing each case. Catastrophic tree failure is an event that involves the interaction of forces upon a very complex tree system. There are few resources and tools available to diagnose drought-related failures. Of the catastrophic failures that I have recently observed in Atlanta, drought has not been the primary or secondary cause. Rather, each case involved serious structural problems such as ...

Once again the experts got it wrong. Fall color doom sayers were fueling the fire of arboreal panic earlier this year, looking into their silvicultural crystal balls and predicting a disappointing season for leaf viewing aficionados. The drought, the regional 'experts' said, would cause trees to shorten their color display and bring fall senescence much earlier than usual. Of course, that hasn't happened. The fall color around town is actually rather good. In fact, this fall seems to be unusually long. In previous years, even those with adequate rainfall, leaves have tended to fall much quicker. For example, by the end of November in zones 7 and 8, Tulip poplar Liriodendron tulipifera has all but completely dropped its leaves. But that just isn't the case in 2007. Zelkova trees have been showing great uniform color in parking lot islands. Red maple trees have been more colorful, on average, than recent years. Sweetgums are holding on to their leaves and ar...

Even though Georgia suffered a late freeze and a record drought in 2007, the state's Pecan trees are set to produce one of the best crops of nuts in recent history. The UGA Cooperative extension service estimates that our beloved Carya illinoensis will provide 90 million to 95 million pounds of pecans this season. Earlier this year, many Pecans in the central and eastern part of the state sustained damage from the frost, but apparently most trees recovered and have set a bumper crop of nuts. Growers estimate that the 2007 crop will be double that of last year's pitiful crop, which was one of the state's lowest in pecan production. The current drought conditions are damaging; but have had an unexpected consequence: the drought has kept insects and diseases from ruining the Pecan nuts. Aphids , mites , and scab are common pests of Pecan trees. In addition, farmers have had the rare option of spraying less chemical controls such as insecticides and fungicides. In some ...

After months of little rain, trees around the Atlanta area are beginning to look a little parched. The weakest trees are the ones that succumb to moisture stress first. Sometimes its the trees that have been damaged from soil disturbance, such as on construction sites or even on lawns that have been over-manicured. Construction sites may have compacted soil that drives out pore space in the soil. Over manicured lawns may have been over-watered in the past or been graded by machinery that destroyed fine roots in the upper strata of the soil profile. Trees growing in regions that are already dry may be on the edge of critical moisture stress. A casual drive through south DeKalb County reveals Loblolly pines dying on the rock outcrops. These trees functioned under normal rainfall conditions, but this year has been especially hard on them. Perhaps, the stronger trees will re-populate the area. Once called "The most massive and longest lived organisms on Earth" by the late A...