Fig. 1. Example bioassay for biological control of a plant pathogen. Begonias were grown in the greenhouse and inoculated with Botrytis cinerea under conditions optimal for the development of disease. Treatments differing in their efficacy are shown, from left to right: untreated (Un), CaCl2, chlorothalonil (Fung), and the biocontrol agent Trichoderma hamatum T382 inoculated into the potting mix (T382). Photo courtesy of Dr. H. Hoitink.

Image from the Plant Management Network Image Collections.
Source: Plant Health Progress - Biological Control of Plant Pathogens: Research, Commercialization, and Application in the USA

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