Biological Control of Phoma and Pythium Damping‐Off of Sugar‐Beet with Pythium oligandrum

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Abstract
Flooding freshly harvested oospores in sterile distilled water (SDW) for several days enhanced germination in 3 out of 4 isolates of Phythium oligandrum. Treatment of SDW‐flooded oospores with myo‐inositol increased germinability during the first 20 days of storage at 15°C. Seed dressing with oospores of P. oligandrum controlled pre‐ and post‐emergence damping‐off of sugar‐beet caused by soil‐borne P. ultimum and seed‐borne Phoma betae. For some isolates, flooded oospores in SDW and treatment with myo‐inositol increased efficacy of the seed dressing. However, no significant control of damping‐off caused by Rhizoctonia solani was observed.On corn‐meal agar, P. oligandrum coiled around and penetrated hyphae of P. ultimum and R. solani, but did not interfere with Ph. betae.