Biocontrol Science and Technology (2005) 15, 299-308

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Byeongseok Ahn, Timothy Paulitz, Suha Jabaji-Hare and Alan Watson (2005)
Enhancement of Colletotrichum coccodes virulence by inhibitors of plant defense mechanisms
Biocontrol Science and Technology 15 (3), 299-308
Abstract: alpha-Amino-oxyacetic acid (AOA), 2-deoxy-d-glucose (DDG), mannose, and oxalic acid were tested as possible synergizers to enhance the efficacy of Colletotrichum coccodes, as a biological control agent of Abutilon theophrasti. All the chemicals reduced C. coccodes conidia germination and appressoria formation, but the virulence of C. coccodes was significantly enhanced when C. coccodes was applied to A. theophrasti after mannose and oxalic acid were vacuum-infiltrated through the leaf cuticle. Lipophilic analogues, 1-amino-ethyl-phosphonic acid diisopropyl ester of oxalic acid, oxalic acid diammonium salt, and 4,6-di-O-methyl-d-mannose, did not result in more severe disease on velvetleaf and there was no impact on A. theophrasti growth. These results may be due to strong antifungal effects, possible functional changes due to chemical structural changes, size of the chemical molecule, or lack of inhibitory effect of these chemicals on plant defense mechanisms. It is also possible that the defense mechanisms that these chemicals can influence are not active in A. theophrasti. Comprehensive understanding of the defense mechanisms of A. theophrasti that limit C. coccodes infection and ways to breach these defense strategies should result in improved weed suppression.
(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): Alan K. Watson, Timothy C. Paulitz

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host
general biology - morphology - evolution


Pest and/or beneficial records:

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


Abutilon theophrasti (weed)
Colletotrichum coccodes (weed pathogen) Abutilon theophrasti (weed)