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Proceedings of Past Forest Nursery Association Meetings:

Principles and Potential for Biocontrol of Diseases in Forest and Conservation Nurseries
R.L. James, R.K. Dumroese, and D.L. Wenny
1992: Fallen Leaf Lake, CA
Biological control is the reduction of
inoculum density or disease-producing activities of plant
pathogens by other organisms, accomplished through
environmental manipulations or mass introduction of
antagonists. Biocontrol agents exert their effects on
pathogens by competing for niches or other limited resources,
production of antibiotics, exhibiting hyperparasitism, and
inducing fungistasis. Developing commercial biocontrol
products is a costly, time-consuming process requiring
extensive testing at several levels. Very few commercial
biocontrol products are currently available to control plant
diseases. Although many bacteria and fungi show promise as
biocontrol agents, few are available for use or are effective
against a wide range of plant pathogens. For biological
control to become more widely applicable in forest and
conservation nurseries, determined commitments by growers to
promote and support greater research and development will be
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