Previous experiments showed that seven
bacteria identified as Acinetobacter lwoffii (PTA-113
and PTA-152), Bacillus subtilis (PTA-271), Pantoea
agglomerans (PTA-AF1 and PTA-AF2) and Pseudomonas
fluorescens (PTA-268 and PTA-CT2) induced
systemic resistance in grapevine against Botrytis
cinerea. Based on these findings, we investigated
biocontrol capacity of different mixtures under vineyard
conditions over three consecutive years. Treatments
with bacterial mixtures were shown to induce
systemic resistance against B. cinerea on year 2.
Efficacy and duration of such a disease control seemed
to be reinforced on year three without renewal of
bacterial treatments. Accordingly, the effectiveness of
induced resistance varied with mixture type of bacteria
and was accompanied by a stimulation of chitinase and