Occurrence of Bacterial Black Spot on Plum by Xanthomonas aboricola pv.pruni and It's Pathogenicity on Varieties of Some Stone Fruits

Research in Plant Disease 2012;18(1):40-44.
Published online March 30, 2012.

Xanthomonas aboricola pv. pruni에 의한 자두 검은점무늬병의 발생과 핵과류 과수 품종에 대한 병원성

류영현 ( Young Hyun Ryu ) , 이중환 ( Joong Hwan Lee ) , 권태영 ( Tae Young Kwon ) , 김승한 ( Seung Han Kim ) , 김동근 ( Dong Geun Kim )

Occurrence of Bacterial Black Spot on Plum by Xanthomonas aboricola pv.pruni and It's Pathogenicity on Varieties of Some Stone Fruits

Young Hyun Ryu*, Joong Hwan Lee1, Tae Young Kwon1, Seung Han Kim2 and Dong Geun Kim

Institute for Natural Products Research, Uisung 769-803, Korea
¹Dept. of Plant Environment Research, Daegu 702-708, Korea
²Bonghwa Alpine Medicinal Plant Experiment Station, Gyeongsangbuk-do Agricultural Research & Extension Services, Bonghwa 755-843, Korea

Received: December 29, 2011 Revised: February 28, 2012 Accepted: March 12, 2012

Abstract

Xanthomonas arboricola pv. pruni is the causal agent of bacterial black spot disease on some stone fruits, e.g. peach, plum and apricot. To evaluate pathogenicity of Xanthomonas arboricola pv. pruni strain from plum, inoculum of the isolated strain was spray inoculated to fruits and leaves of apricot, Japanese apricot and plum. Apricot and Japanese apricot showed severe black spot symptoms on fruits and shot hole symptoms on leaves. In case of apricot, about fifty percent of fruits did not grow and dropped by hypersensitive reaction to spray infection. Plum, cv. Formosa was very susceptible, showing severe black injury lesions on fruits and cankers on leaves and new twigs. On the other hand, plum cv. Daesukjosaeng, was highly resistant. Fruits of several plum cultivars such as Formosa and Chuhee were severely infected at natural infected orchards by X. arboricola pv. pruni. Where as those of Daesukjosaeng, Taeyang, Soldam and Hongrogen were moderately infected.

Key Words: Apricot, Japanese apricot, Pathogenicity, Plum, Symptom development