In this review, we present an overview and discussion of the screening systems reported to select novel BCAs for biocontrol of microbial plant diseases. The identification of novel BCAs thus forms a critical step in the development of commercial biocontrol products and requires rapid and robust screening methods suitable to evaluate high numbers of candidate BCAs. However, one of the factors hampering the large-scale implementation of biocontrol is the lack of efficient, commercially available biocontrol agents (BCAs). Due its high potential as alternative/complement to these pesticides, biological disease control is now generally recognized and constitute an important tool in integrated pest management (IPM). In current plant disease control, the divergence from chemical pesticide use has been fueled by the public concern about toxicity and environmental impact of these products, the development of pesticide-resistant pathogens, a rising ban of existing pesticides and, a decreased registration of new ones.
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