An article from the December 20,2012 issue Sciencemag.org:

"It is widely accepted that fungal pathogens have an enormous influence on plant and animal life. Indeed, a recent report detailed the extraordinary and frightening impact of these pathogens on species extinctions, food security, and ecosystem disturbances."

http://130.88.242.202/medicine/Aspergillus/Dropbox/Aspergillus_Website/aspergillus-web/articlesoverflow/23253612.pdf