Phytoparasitica (1998) 26, 8-19

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Joseli da Silva Tatagiba, Luiz Antonio Maffia, Roberto W. Barreto, Acelino C. Alfenas and John C. Sutton (1998)
Biological control of Botrytis cinerea in residues and flowers of rose (Rosa hybrida)
Phytoparasitica 26 (1), 8-19
Abstract: Microbial isolates from living petals, petal residues and leaf residues of rose, and from laboratory collections, were evaluated for control of Botrytis cinerea in rose. In leaf residues artificially infested with B. cinerea, isolates of the filamentous fungi Gliocladium roseum, FR136 (unidentified) and Trichoderma inhamatum reduced sporulation of the pathogen by >90%, other filamentous fungi were 25-90% effective, and those of yeasts and bacteria were < 50% effective. In artificially inoculated petal residues, no microbe reduced sporulation of B. cinerea by >75%, but isolates of Cladosporium oxysporum and four yeasts were 51-75% effective, and three filamentous fungi, eight yeasts and Bacillus subtilis isolates were 26-50% effective. Isolates of T. inhamatum, C. oxysporum and G. roseum performed best against B. cinerea among isolates evaluated in leaf residues naturally infested with the pathogen and indigenous microorganisms. Totals of ten isolates of filamentous fungi (including C. oxysporum and C. cladosporioides), two of yeasts and five of Bacillus subtilis completely prevented lesion production by B. cinerea in detached petals, and a further six isolates of filamentous fungi (including G. roseum) and six yeasts were 90-99% effective. Isolates of C. oxysporum, C. cladosporioides and B. subtilis, the most effective microorganisms against B. cinerea in flower buds, reduced number of lesions in the range of 42-65% compared with 59-89% for a standard fungicide (vinclozolin). It is suggested that application of leading antagonists to living rose leaves and flowers should optimize control of inoculum production by B. cinerea when the tissues die. Optimal biocontrol of lesion production in flower buds requires a better understanding of the microenvironment of petals.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Acelino C. Alfenas, Robert Weingart Barreto, Luiz A. Maffia

Research topic(s) for pests/diseases/weeds:
control - general
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Botrytis cinerea Rosa (crop) Brazil (south)
Clonostachys rosea (antagonist) Botrytis cinerea Rosa (crop) Brazil (south)
Bacillus subtilis (antagonist) Botrytis cinerea Rosa (crop) Brazil (south)
Trichoderma inhamatum (antagonist) Botrytis cinerea Rosa (crop) Brazil (south)
Cladosporium oxysporum (antagonist) Botrytis cinerea Rosa (crop) Brazil (south)