Evidence of the role of honey bees (Apis mellifera) as vectors of the bacterial plant pathogen Pseudomonas syringae
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Honey bees (Apis mellifera) have been implicated in the spread of the fire blight pathogen (Erwinia amylovora), and may transmit other bacterial plant pathogens in the process of pollinating crops. Furthermore, the movement of hives from one orchard to another could spread plant diseases over large distances. We investigated whether honey bees might play a role in the transmission of different pathovars of Pseudomonas syringae. We detected live P. syringae pv. actinidiae (Psa), a pathogen of kiwifruit (Actinidia spp.), on caged bees in hives 6 days after the bees were inoculated with Psa, and recorded up to 1.8 × 104 colony forming units of Psa on honey bees foraging naturally on flowers of Psa-infected vines. P. syringae pv. syringae (PssSmr), a pathogen with a wide host range, was spread to untreated bees in a hive within 24 h following the introduction of foragers doused in PssSmr-contaminated pollen and was still detected on bees 9 days later. PssSmr was found on caged bees in hives 6 d after they were inoculated and PssSmr survived in hives for at least 14 days. These results demonstrate that P. syringae can survive in beehives and spread within a hive, which broadens the applicability of results from studies of E. amylovora and supports recommendations for a stand down period before moving beehives from a contaminated to a non-contaminated orchard.
KeywordsDisease vectors Pollination Beehives Actinidia spp Pseudomonas syringae pv. actinidiae Pseudomonas syringae pv. syringae
The authors wish to acknowledge and thank Zespri Group Limited and Kiwifruit Vine Health for their support of this work. This research was funded through research contracts VI1255 and VI1334-30-D from ZESPRI Group Ltd. Janet Yu, Bridgette Moffat, Crystal Felman, Nicola Mauchline, Deirdre Cornish, Frank Parry, Warren Yorston and Annette Ah Chee assisted with the experiments and data collection. We wish to thank Arnon Dag and Michelle Taylor for comments on an early version of this manuscript.
- Alexandrova M, Cimini B, Bazzi C, Carpana E, Massi S, Sabatini AG (2002a) The role of honeybees in spreading Erwinia amylovora. Acta Horticult 590:55–60Google Scholar
- Alexandrova M, Porrini C, Bazzi C, Carpana E, Bigliardi M, Sabatini AG (2002b) Erwinia amylovora longevity in beehives, beehive products and honeybees. Acta Horticult 590:201–205Google Scholar
- Costa G, Testolin R, Vizzotto G (1993) Kiwifruit pollination: an unbiased estimate of wind and bee contribution. New Zeal J Crop Hort 21:189–195Google Scholar
- Craig JL, Stewart AM, Pomeroy N, Heath A, Goodwin R (1988) A review of kiwifruit pollination: where to next? N Z J Exp Agric 16:385–399Google Scholar
- Gallelli A, Talocci S, L’Aurora A, Loreti S (2011) Detection of Pseudomonas syringae pv. actinidiae, causal agent of bacterial canker of kiwifruit, from symptomless fruits and twigs, and from pollen. Phytopathol Mediterr 50:462–472Google Scholar
- Gossard H (1916) Is the hive a center for distributing Fire Blight? Is aphid honey dew a medium for spreading blight? J Econ Entomol 9:59Google Scholar
- Koh YJ, Nou IS (2002) DNA markers for identification of Pseudomonas syringae pv. actinidiae. Mol Cell 13:309–314Google Scholar
- Rees-George J, Vanneste JL, Cornish DA, Pushparajah IPS, Yu J, Templeton MD, Everett KR (2010) Detection of Pseudomonas syringae pv. actinidiae using polymerase chain reaction (PCR) primers based on the 16S-23S rDNA intertranscribed spacer region and comparison with PCR primers based on other gene regions. Plant Pathol 59:453–464CrossRefGoogle Scholar
- Rikkerink E, Andersen M, Rees-George J, Cui W, Vanneste JL, Templeton M (2011) Development of a rapid tool for the molecular characterisation of Psa haplotypes. Plant Food Res Rep 6361:31Google Scholar
- Stefani E, Giovanardi D (2011) Dissemination of Pseudomonas syringae pv. actinidiae through pollen and its epiphytic life on leaves and fruits. Phytopathol Mediterr 50:489–496Google Scholar
- Vanneste J, Giovanardi D, Yu J, Cornish D, Kay C, Spinelli F, Stefani E (2011) Detection of Pseudomonas syringae pv. actinidiae in kiwifruit pollen samples. N Z Plant Prot 64:246–251Google Scholar