Phosphonate controls sudden oak death pathogen for up to 2 years

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" Phosphonate controls sudden oak death pathogen for up to 2 years "
Garbelotto, Matteo; Schmidt, Doug

Document Type	:	AL
Record Number	:	944581
Doc. No	:	LA2dw1292j
Language of Document	:	English
Main Entry	:	Garbelotto, Matteo; Schmidt, Doug
Title & Author	:	Phosphonate controls sudden oak death pathogen for up to 2 years [Article]\ Garbelotto, Matteo; Schmidt, Doug
Title of Periodical	:	California Agriculture
Volume/ Issue Number	:	63/1
Date	:	2009
Abstract	:	Since its emergence in the late 1990s, sudden oak death has killed mature oak trees and tanoaks in 14 California counties. Treatment options are now available to safeguard these trees from infection by Phytophthora ramorum, the aggressive and exotic pathogen responsible for sudden oak death. We provide an update on current knowledge regarding this emergent disease in California, and present results from three controlled experiments of two chemical treatments to manage the disease in oaks and tanoaks. Phosphonate treatments, legally registered in California to control sudden oak death, were effective in slowing both infection and growth rates for at least 18 months. Conversely, an alternative method consisting of an azomite soil amendment and bark lime wash was always ineffective, and did not reduce either growth or infection rates.