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ISHS Acta Horticulturae 489: VIII International Workshop on Fire Blight

CONTROL OF FIRE BLIGHT WITH THE PLANT ACTIVATOR BION®

Authors:   W. Zeller, V. Zeller
Keywords:   Biocontrol, Erwinia amylovora, plant activator BION®, systemic acquired resistance (SAR)
DOI:   10.17660/ActaHortic.1999.489.114
Abstract:
After the first positive results of the plant activator BION® (Acibenzolar-S-methyl) of the company NOVARTIS against several phytopathogens, it is known to have a systemic acquired resistance (SAR) effect. In the present study BION® was tested on the similar effect against Fire Blight (Erwinia amylovora) as a possible alternative to streptomycin. First in in vitro studies (in agardiffusion test) no inhibitory effect against the pathogen was found. In a bioassay on pear fruit slices BION® could induce a reduction in exsudate production of 63% compared to water treated control. In further experiments under greenhouse conditions with the highly susceptible M26 rootstock BION® treatment resulted in a marked SAR effect. A high decrease of the disease rate of 70 % was correlated with a reduction of the bacterial growth up to 60%.

Further studies in the field under artificial infection conditions during full bloom with the highly susceptible apple variety 'James Grieve' resulted in a control effect of BION® up to 68% with two concentrations of the compound. Summarizing the results of the present study BION® showed a marked resistance induction effect against Fire Blight.

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