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New Zealand Plant Protection 65 (2012): 25-28

Survival of Pseudomonas syringae pv. actinidiae on the orchard floor over winter

J.L. Tyson, J. Rees-George, C.L. Curtis, M.A. Manning and R.A. Fullerton

ABSTRACT

Pseudomonas syringae pv. actinidiae (Psa) was first identified on kiwifruit (Actinidia spp.) in New Zealand in November 2010, and has since caused serious losses, particularly in Te Puke. The role of fallen leaves and pruning debris in the life-cycle of Psa in New Zealand is unknown. Survival of Psa was investigated in fallen leaves and cane prunings over winter 2011. Heavily infected leaves, and cane prunings with Psa die-back symptoms, were kept on the orchard floor and in the laboratory, and assayed weekly for the presence of viable Psa. At leaf-fall, all leaves yielded live Psa. Although detection frequency declined over time, especially after 5-6 weeks, Psa was still isolated from leaf litter 15 weeks after leaf-fall and cane prunings 11 weeks after winter pruning. These results indicate that the pathogen overwinters readily in leaf litter and pruning debris, representing a potential inoculum source for infection of new spring growth.

Keywords: Psa, bacterial canker, inoculum survival, qPCR.

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