Regional Comparisons of Sensitivities of P. citrophthora and P. syringae Causing Citrus Brown Rot in California to Four New and Two Older Fungicides. Phytophthora

Isolates of the citrus brown rot pathogens P. citrophthora and P. syringae from the Inland Empire (IE) and Ventura Co. (VE) regions of southern California were evaluated for their sensitivity to ethaboxam, fluopicolide, mandipropamid, and oxathiapiprolin, and the previously published baselines that were generated for Central Valley (CV) isolates of California were expanded. Population genomics was utilized to observe any genotypic patterns underlying the observed phenotypes.