Photos clockwise from top left: white pine blister rust, Cronartium ribicola (FAO/FO-0006/ R. Hoff); Ceratocystis fimbriata on poplar, Populus spp. (Bugwood.org/1442139/J.J. Witcosky); Ophiostoma ulmi on American elm, Ulmus americana (Bugwood.org/1301073/J. O'Brien)

Fungi

Photos: Top - Discula destructiva (Bugwood.org/0590051/R.L. Anderson); Bottom - Phytophthora cinnamomi on sand pine Pinus clausa (Bugwood.org/4823085/E.L. Barnard)
last updated:  Tuesday, April 21, 2009