New Zealand Plant Protection 68 (2015): 328-331
The influence of leaf age on infection of Actinidia species by Pseudomonas syringae pv. actinidiae (Psa) was investigated using two approaches: (a) inoculation of potted 'Hayward' and 'Hort16A' kiwifruit plants and (b) inoculation of whole leaves in a detached leaf assay. Whole plants and detached leaves were spray inoculated with Psa biovar 3 (haplotype NZ-V; Psa-V) and maintained in a saturated environment. Flecking was evident on some of the leaves 8 days after inoculation. Many of the flecks later became necrotic spots with halos similar to the Psa leaf infections that have been observed in the field. With both methods, a higher percentage of leaves that were 1-3 weeks of age at inoculation had flecking and spotting than did leaves of other ages. Leaves that were 7 weeks or older did not show any symptoms of infection by Psa. Overall, leaves of 'Hort16A' showed slightly more flecking and spotting than 'Hayward'.
Keywords: Pseudomonas syringae pv actinidiae, Psa, bacterial canker, leaf age..
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Copyright © 2015 New Zealand Plant Protection Society (Inc.).