Skip to main content
ARS Home » Pacific West Area » Davis, California » Crops Pathology and Genetics Research » Research » Publications at this Location » Publication #368532

Research Project: Integrated Disease Management Strategies for Woody Perennial Species

Location: Crops Pathology and Genetics Research

Title: Field evaluation of olive (Olea europaea) genotypes for resistance to Pseudomonas savastanoi pv savastanoi

item SALMAN, MAZEN - Palestine Technical University- Kadoorie
item Kluepfel, Daniel
item GREENHUT, RACHEL - Hi Fidelity Genetics
item Preece, John
item FERGUSON, LOUISE - University Of California, Davis

Submitted to: Journal of Plant Pathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/1/2020
Publication Date: 5/25/2020
Citation: Salman, M., Kluepfel, D.A., Greenhut, R., Preece, J.E., Ferguson, L. 2020. Field evaluation of olive (Olea europaea) genotypes for resistance to Pseudomonas savastanoi pv savastanoi. Journal of Plant Pathology. 102:663-670.

Interpretive Summary:

Technical Abstract: Current commercial Olive (Olea europaea) cultivars are susceptible to olive knot disease caused by Pseudomonas savastanoi pv savastanoi. Here we report on the examination of the Olive germplasm collection maintained at the USDA-ARS National Clonal Germplasm Repository (NCGR) in Winters, California for genotypes resistant to P. s. pv savastanoi. Over a two year period we evaluated olive knot disease incidence on X00 trees which represents 140 unique accessions consisting of 120 named cultivars originating from the Mediterranean Basin, South America, and California, including several hybrids, and related subspecies, Olea europaea ssp. cuspidate. All genotypes were replicated in four blocks with trees in these blocks ranging in age from 6 to 35 years old. The disease index was higher in 2014 (43.5%) than that in 2013 (29.4%). The percentage of infection varied significantly (P < 0.05) between the different blocks in the study orchard. Genotypes Bouteillon, Toffahi of Syria, Tragolea and Azapa were the most susceptible to olive knot. Verdeal, Leccino, Ascolana Tenera and Manzanilla De Sevilla were the most resistant genotypes. No genotype was completely resistant to P. s. pv savastanoi.