BotryStop WP is a biological fungicide containing spores of Ulocladium oudemansii (U3 Strain), that effectively controls Botrytis cinera, Sclerotinia sclerotiorum and other mold and rot inducing pathogens.BotryStop WP works by sporulating dead and senescent plant debris they germinate and colonize the dead tissue. Additional sporulation can occur on the developing mycelium and these new spores may colonize remaining debris. BotryStop WP aggressively out competes Botrytis spp. and Sclerotinia spp. for the physical space and nutrients in the dead and senescing plant tissue; it is a true antagonist. BotryStop WP is non-invasive and causes no damage to live plant tissue. With this mechanism of action, it is highly unlikely that resistance to BotryStop WP will develop.