US Forest Service
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Washington DC 20250-0003

Forest Service Programs

Disease

Picture of an oak twig affected by sudden oak death.

Phycomycota > Peronosporales > Pythiaceae
Phytophthora ramorum S. Werres, A.W.A.M. de Cock

photo courtesy of »

Joseph O'Brien, USDA Forest Service

Picture of a Sirex woodwasp.

Insecta >Hymenoptera > Siricidae
Sirex noctilio Fabricus

photo courtesy of »

William M. Ciesla, Forest Health Management International, www.forestryimages.org

Picture of a tree-of-heaven.

Magnoliopsida > Sapindales > Simaroubaceae > Ailanthusaltissima (P. Mill.) Swingle
Synonym(s): ailanthus, copal tree, tree-of-heaven

photo courtesy of »

Chuck Bargeron, The University of Georgia.

Picture of a New Zealand mud snail.

Potamopyrgus > Antipodarum

photo courtesy of »

D.L. Gustafson

Last modified: Tuesday, 04-Apr-2006 22:26:51 EDT