%0 Journal Article %A M. Garbelotto %A D.J. Schmidt %A T.Y. Harnik %T Phosphite Injections and Bark Application of Phosphite + Pentrabarkā„¢ Control Sudden Oak Death in Coast Live Oak %D 2007 %R 10.48044/jauf.2007.035 %J Arboriculture & Urban Forestry (AUF) %P 309-317 %V 33 %N 5 %X In each of seven fully controlled experiments, potted California, U.S. coast live oak trees were artificially inoculated with Phytophthora ramorum, the agent of a tree disease commonly referred to as sudden oak death. Phosphites were applied to trees using a range of application approaches either as preventive or therapeutic treatments. Soil drenches and bark application of phosphites were ineffective; foliar application of phosphites amended with surfactants were effective only at times and always caused phytotoxicity. On the other hand, injections of phosphites and bark applications of phosphites + the organosilicate surfactant Pentrabarkā„¢ (Agrichem, Medina, OH, U.S.) were consistently effective in suppressing bark colonization by this pathogen without causing phytotoxicity. This is the first study describing the use of a chemical treatment amended with an organosilicate surfactant for topical bark applications. %U https://auf.isa-arbor.com/content/isa/33/5/309.full.pdf