Bacterial canker of Kiwifruit (Actinidia chinensis) has recently been reported in Japan. The causal pathogen is classified in Pseudomonas syringae on the basis of laboratory tests and is similar to, but not identical with, P. syringae pv. morsprunorum. In inoculated kiwifruit, the pathogen from kiwifruit reproduces the characteristic canker and leaf spot symptoms.P. syringae pv. syringae and P. syringae pv. morsprunorum are only weakly virulent to kiwifruit.The pathogen from kiwifruit is weakly pathogenic to peach and Japanese apricot, but not to 24 other plant species tested. The pathogen is considered to be a pathovar of P. syringae and the name P. syringae pv. actinidiae pv. nov. is proposed. Strain Kw-11 (ICMP9617) is designated as the pathotype strain.
A bacterial canker disease of kiwifruit (Actinidia chinensis) has been observed in Shizuoka Prefecture, Japan. Symptoms appear on trunks, leaders and over-wintering canes from late winter to early spring as cankers and cracks, when red-rusty brown bacterial ooze exudes from these lesions or from apparently healthy buds, leaf scars, lenticels and joints of trunks, leaders and canes.In late spring, brown water-soaked lesions with halos appear on leaves, and wilt or blight of vigorous canes and flower buds is also observed.A characteristic white bacterium is consistently isolated from the affected tissues, isolates of which reproduce typical symptoms on kiwifruit and Actinidia arguta when inoculated either with or without wounding in spring and winter. Kiwifruit leaves are most susceptible to the pathogen just before maturation and are less susceptible at younger and older stages. Climatic conditions such as low temperatures, strong winds, and heavy rainfall appear to promote the disease. Applications of streptomycin, kasugamycin or inorganic copper formulations reduced disease development on leaves.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.