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Title: Occurrence,pathogenicity of Pseudomonas syringae Van hall,the casual agent of bacterial blight of coffee (BBC) and effect of foliar fertilizer formulations on the pathogen ice nucleation activity.
Authors: Mugiira, Roy .B.
Keywords: Pathogenicity
Issue Date: Mar-2000
Publisher: Egerton University
Abstract: Bacterial blight of coffee (BBC), a condition of twig dieback caused by Pseudomonas syringae is still a major constraint in coffee production more than 60 years since it was first reported in Kenya. Unlike the other two most important coffee diseases; coffee berry disease (CBD) and coffee leaf rust which are fungal, BBC is bacterial and apparently least studied. BBC was originally confined to the West of the Rift Valley and Central Rift. The disease is spreading fast into other coffee growing areas in Kenya. Epidemics have devastated plantations causing enonnous crop loses where recommended approaches to control have failed to achieve significant levels of disease control. The need to explore alternative strategies to control BBC is therefore apparent. This study was can-ied out with the broad objective of assessing potential for control of BBC using foliar fertilizer sprays to inhibit ice nucleation activity (INA) of the causative agent which has been shown to play an important role in the development of the disease. Four commercially available foliar fertilizer formulations; Bayfolan (Bayer Co. E.A Ltd), F armphoska (Farrnchem Kenya Ltd) Farmfoliar (Fannguard Kenya Ltd ) and Mbolea Safi (Nova Chemicals Kenya Ltd) were used for this study. A set of biochemical, physiological and pathogenicity tests were used to distinguish the pathogenic isolate of P. syringae from a host of other phylloplane epiphytic bacteria. The pathogenic isolate was ice nucleation active(INA*). All the fertilizer formulations tested, significantly (P5001) inhibited bacterial ice nucleation activity (INA) of P. syringae. Antimicrobical potential of the fertilizer formulations against P. syringae was also assessed. The four fertilizer formulations showed significant (P5001) antimicrobial
Appears in Collections:Faculty of Agriculture

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