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IPS Bark Beetles

IPS Bark Beetles

Introduction  

Four species of Ips bark beetles live in the southeastern U.S., all with similar biology, ecology, and life cycles.  Ips bark beetles primarily colonize pine trees, but may also use other conifers.  Male beetles enter the tree, boring to the phloem, and release chemicals that travel through the air and attract females.  These females arrive, mate, complete gallery construction with the male, and lay eggs in the gallery.  Larvae feed in the phloem, and exit the tree when development is complete.  In the Deep South, Ips bark beetles can have 8-10 generations per year.  These beetles generally do not attack healthy trees – rather, they are attracted to trees that are already stressed, weakened, injured, or dying.  

Identification  

Adult beetles are small (<1/4”), brown, and cylinder shaped with spines on the back end.

Current Situation

Management

Direct control using insecticides may be possible for high-value trees, while stand management tactics that promote healthy forests will minimize risk in other areas.

What Can You Do?

Resources

Contacts

Nathan Hoover

Forest Health Forester
(615) 289-7373
Nathan.Hoover@tn.gov