PT  - JOURNAL ARTICLE
AU  - M. Garbelotto
AU  - D.J. Schmidt
AU  - T.Y. Harnik
TI  - Phosphite Injections and Bark Application of Phosphite + Pentrabark™ Control Sudden Oak Death in Coast Live Oak
AID  - 10.48044/jauf.2007.035
DP  - 2007 Sep 01
TA  - Arboriculture & Urban Forestry (AUF)
PG  - 309--317
VI  - 33
IP  - 5
4099  - http://auf.isa-arbor.com/content/33/5/309.short
4100  - http://auf.isa-arbor.com/content/33/5/309.full
AB  - 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 Pentrabark™ (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.