Boring insects can cause a great deal of damage to landscape trees, but infestations are treatable if caught in time, advises garden-pest specialist Frank Hale. Early indications of an infestation are sap running down the trunk, yellow leaves or sawdust at the base of the trunk. The larvae of the round-head borer kicks out long strips of wood that resemble Shredded Wheat. Certain beetles lay their eggs in tree bark. Once the larvae hatch, they begin eating their way into the tree. You can kill the insects by sticking a piece of wire into the holes adult insects have bored in the bark--but that works only for areas of the trunk you can reach. Borer infestations may be treated with parasitic nematodes, which attack the larvae. Boring insects usually lay their eggs in spring and summer. The tunnels boring insects carve inside a tree provide a direct route for pathogens to enter. To protect trees susceptible to attack from boring insects, such as white birch, apply an insecticide when the pests are active. Insecticides with a residual effect, e.g., Lindane, control insects throughout the season. Only the bark of the tree should be sprayed. Insects such as peach-tree borers tunnel under the bark and can girdle a tree. Borers enter dogwood trees through wounds in the bark. To protect trees, keep them well watered so the sap runs freely, avoid damaging the bark with string trimmers and mowers, and make sure the area under the tree is free of debris. If you see signs of insect damage, begin a spray program.
GUESTS :
Dr. Frank Hale
5201 Marchant Dr.
Nashville, TN 37211-5201
Phone: 615-832-6802
Fax: 615-832-0043
Email: fhale@cru.gw.utk.edu
Website: www.utextension.utk.edu
UT Agricultural Extension
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