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Effect of sterol biosynthesis inhibitors on phytotoxin (viridiol) production by Gliocladium virens in culture



Effect of sterol biosynthesis inhibitors on phytotoxin (viridiol) production by Gliocladium virens in culture



Phytopathology 84(9): 969-972



The steroid phytotoxin viridiol produced by Gliocladium virens is a major limiting factor in the amount of G. virens-millet preparation that can be used on cottonseed to control damping-off incited by Rhizoctonia solani and Pythium ultimum. Treatment of developing G. virens cultures with 1 microgram ml-1 of the sterol production inhibitors propiconazole or flusilazole and 1-4 microgram ml-1 of myclobutanil or triadimenol suppressed viridiol production without significant adverse effect on the growth of G. virens or on the biosynthesis of the nonsteroid antibiotics gliotoxin and gliovirin. Greater amounts of the antibiotic-producing biocontrol preparation can thus be used to treat seed without concomitant phytotoxic effects on the emerging seedling radicle.

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Accession: 002604899

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