(Agrilus planipennis)
What it is: The emerald ash borer is a green beetle whose larval stage disrupts the tree’s ability to carry water and nutrients.
Areas affected: Northeastern United States, recently spreading south to Louisiana and west to Colorado; see the USDA map of confirmed emerald ash borer (EAB) areas.
Trees species it can affect: All types of ash trees including white ash (Fraxinus americana), green ash (Fraxinus pennsylvanica), black ash (Fraxinus nigra) and blue ash (Fraxinus quadrangulata); unreported on Texas ash (Fraxinus albicans, formerly F. texensis)
How to spot it: Signs of the disease include prematurely yellowing leaves in the summer followed by dead branches. An arborist will likely confirm the presence of the disease by looking for signs that the beetle has entered the tree bark and burrowed its tunnels beneath the bark.
How to treat it: Diseased trees must be removed and replaced. Suitable replacements for ash trees include maples (Acer spp)., sycamores (Platanus spp.) and nut trees in the Carya genus. Hybrid disease-resistant cultivars of these trees are available and are great deciduous shade trees with fall color.
How to prevent it: Fungicidal injections are on the market to help avoid elm tree infection, but they are not a sure bet.
Shown: American sycamore (Platanus occidentalis) trees lining a path in a Charlotte, North Carolina, garden; these trees are native from Nebraska south to Texas and all parts east
from Houzz http://ift.tt/232x371
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