Determination of Susceptibility of Citrus and Stone Fruit Cultivars Against Pseudomonas syringae pv. syringae in Turkey

Pseudomonas syringae pv. syringae, that can cause disease in citrus and stone fruit production areas, is a destructive plant pathogenic bacterial disease agent worldwide. While the pathogen causes citrus blast disease on citrus cultivars, it is known as bacterial cancer disease on stone fruits. Control of the disease is limited due to the lack of resistant cultivars through the world. In this study, susceptibility responses of 28 different citrus and stone fruit cultivars against Pseudomonas syringae pv. syringae were determined. For this purpose, five Citrus sinensis, six Citrus reticulata, three Citrus limon, two Citrus paradisi, three Prunus persica nucipersica, three Prunus persica, three Prunus domestic and three Prunus armeniaca cultivars were used. In the experiments, disease ratios of citrus and stone fruit cultivars varied between 2.55–7.12% and between 3.39–51.01%, respectively. Among 28 tested cultivars, 25% of the cultivars were susceptible (cvs. Cara Cara, V. Midknight, Nova, Okitsu, Meyer, Riored and Early Fresh), 46.43% of the cultivars were moderately susceptible (cvs. Fukumoto, Lane late, Navelina, Robinson, W. Murcott, Clausellina Eureka, Flariba (N2-17), Gartella, Garofa (N2-92), Honey Blush, Flored and Black Amber), 10.71% were lightly susceptible (cvs. Ortanique, Black Beauty and Magador) and 17.86% were minimally susceptible (cvs. Lisbon, Henderson, Black Diamond, Colorado and Ninfa) to Pseudomonas syringae pv. syringae. All tested citrus and stone fruit cultivars were classified between minimally susceptible and susceptible. The minimally susceptible citrus and stone fruit varieties should be preferred in newly planted orchards.