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 tree germplasm collection maintained at the USDA-ARS National Clonal Germplasm Repository (NCGR) in Winters, California for the incidence of olive knot disease. Over a two year period we evaluated olive knot disease incidence on 506 trees representing 144 unique accessions consisting of 104 named cultivars originating from the Mediterranean Basin, South America, and California, including several hybrids, and related subspecies e.g. Olea europaea ssp. cuspidata. All genotypes were replicated in four blocks with trees in these blocks ranging in age from 6 to 35 year old. The disease index was higher in 2014 (43.5%) than in 2013 (29.4%). The percentage of infection varied significantly (P < 0.05) between the different blocks in the study orchard. Eleven genotypes exhibited greater than 30% disease severity with Tragolea (Greece), Barnea (Israel) and Arbusana (Spain) being the most susceptible to olive knot disease. Eighty-six genotypes exhibited less than 10% disease severity with 17 genotypes of this group showing zero olive knot incidence over the two year observation period.

中文翻译：

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橄榄（Olea europaea）基因型对假单胞菌的抗性的田间评价。萨瓦斯坦尼

当前的商品橄榄（油橄榄（Olea europaea））品种易患由Pseudomonas savastanoi pv引起的橄榄结病。savastanoi。在这里，我们报告了在加利福尼亚州温特斯的USDA-ARS国家克隆种质资源库（NCGR）中维护的橄榄树种质收集的检查情况，以了解橄榄结病的发病率。在两年的时间里，我们评估了506种树木上的橄榄结病发病率，这些树木代表144种独特的种，包括来自地中海盆地，南美和加利福尼亚的104个命名品种，包括几种杂种以及相关的亚种，例如油橄榄。cuspidata。所有基因型均被复制到四个区域中，这些区域的树木年龄在6至35岁之间。该疾病指数在2014年（43.5％）高于2013年（29.4％）。 在研究果园的不同区域之间，感染百分比差异显着（P <0.05）。11种基因型表现出超过30％的疾病严重程度，其中Tragolea（希腊），Barnea（以色列）和Arbusana（西班牙）最容易受到橄榄结病的影响。在两年的观察期内，八十六种基因型表现出的疾病严重程度低于10％，该组中的十七种基因型显示出零的橄榄结发生率。