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Effect of Storage on the Survival and Biocontrol Activity of Pythium oligandrum in Pelleted Sugar Beet Seed

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Seeds of sugar beet were pelleted with oospores of Pythium oligandrum and stored for 6 years at 8 20IC. Mycelium of P. oligandrum grew from pelleted seed when plated on cornmeal agar (CMA) within 48 h from 100% of seeds stored for 0, 2 and 4 years, and from 93% of seeds stored for 6 years. The germination of oospores removed from pelleted seed immediately after pelleting was 30% on CMA after 18 h of incubation, but storage gradually reduced germination to only 16% after 48 h of incubation for oospores removed from seed stored for 6 years. The biocontrol activity of P. oligandrum -pelleted seed was also tested after 6 years of storage in mixes of soil naturally infested with Pythium spp. and Aphanomyces cochlioides , and sand. P. oligandrum -pelleted seed had no effect in reducing damping-off due to the combined effect of Pythium spp. and A. cochlioides in 5 and 1% (v/v) soil-sand mixtures. However, in the 1% (v/v) soil-sand mixture, P. oligandrum significantly reduced Pythium spp.-induced damping-off from 33 to 26%.
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Keywords: APHANOMYCES COCHLIOIDES; OOSPORES; PYTHIUM OLIGANDRUM; PYTHIUM SPP; SEED PELLETS; SUGAR BEET

Document Type: Research Article

Publication date: 1998-06-01

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