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2010 APS Annual Meeting

 

Effects of seed treatment on root diseases and yields of soybean
S. S. NAVI (1), X. Yang (1)
(1) Iowa State University, Ames, IA, U.S.A.
Phytopathology 100:S89

The objective of the study was to evaluate the effects of fungicide seed treatment on sudden death syndrome (Fusarium virguliforme), Rhizoctonia root rot (Rhizoctonia solani), and Sclerotinia stem rot (Sclerotinia sclerotiorum) and their effects on soybean yields. Field tests against F. virguliforme and R. solani was conducted at Ames, and against S. sclerotiorum at Nashua, during 2005 to 2009. Products from various companies and an unregistered bio-fungicide from our lab were tested. Experiments were laid out in RCBD with four replications. Percent incidence and severity due to R. solani was recorded at 7, 14, and 21 days after emergence and for F. virguliforme and S. sclerotiorum at flowering, pod formation and maturity growth stages. The central four rows of each plot were harvested and plot yields bushels/acre (adjusted to 13% grain moisture) was recorded. Some of the products tested were effective in minimizing the diseases and increased yields from 3 to 9 bushels per acre over untreated controls.

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