Outlooks in Pesticide Managment Feb. 2008. pp   DOI: 10.1564/19feb00

Changing paradigms on the mode of action and uses of Trichoderma spp. for biocontrol.

Harman, G.E., T. Björkman, K. Ondik, M. Soresh.

Department of Horticultural Sciences, New York State Agricultural Experiment Station, Cornell University, Geneva, NY 14456

ABSTRACT Trichoderma spp. have been known to control plant diseases biologically for more than 70 years. Within the past decade, these fungi have begun to be used widely in commercial agriculture. The long period of development between the original discoveries of some of the useful properties of these fungi and their first commercial adoption can be
explained in part by an incomplete understanding of the nature of the biocontrol interaction.  Some strains are very good at inducing increased growth responses, while others are very good at inducing resistance. T. harzianum T22 seems to be a good generalist. We expect that, as the full mechanisms of the changes induced by root colonization are understood, including both the elicitors produced by effective strains as well as the changes induced in plants, it will be possible to use this knowledge to produce much more effective biocontrol organisms and systems.

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