In earlier studies, we found that P. fluorescens strain CZ signifi-
cantly suppressed TMV in vitro by producing an antibiotic protein
and that this PGPR could provide efficient protection against TMV
infection by forming protective bacteria films and triggering ISR
when sprayed on tobacco leaves (Wu et al., 2008, 2009; Shen et al.,
2012). The objective of this study was to evaluate the effectiveness
of this bacterial antagonist CZ powder in controlling TMV when
applied in greenhouses and in the field.