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Interactions of Oxadiazon and Dinoseb with Stem Rot in Peanuts

Published online by Cambridge University Press:  12 June 2017

P.A. Backman ,
R. Rodriguez-Kabana  and
G.A. Buchanan
P.A. Backman
Affiliation:
Dep. Bot. and Microbiol., Auburn Univ. Agric. Exp. Stn., Auburn, AL 36830
R. Rodriguez-Kabana
Affiliation:
Dep. Bot. and Microbiol., Auburn Univ. Agric. Exp. Stn., Auburn, AL 36830
G.A. Buchanan
Affiliation:
Dep. Agron., Auburn Univ. Agric. Exp. Stn., Auburn, AL 36830
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Abstract

Oxadiazon [2-tert-butyl-4-(2,4-dichloro-5-isopropoxyphenyl)-δ2-1,3,4-oxadiazolin-5-one] significantly reduced the incidence of stem rot caused by the soil-borne pathogen Sclerotium rolfsii L. in field-grown peanuts (Arachis hypogaea L. ‘Florunner’). Dinoseb (2-sec-butyl-4,6-dinitrophenol) (1.7 kg/ha) used alone also reduced stem rot, but when combined with oxadiazon control was not significantly improved, although yields were significantly increased. Dinoseb was toxic to S. rolfsii in laboratory tests, suggesting that disease reductions and yield increases are attributable to this observation. Oxadiazon was non-toxic to the pathogen, indicating that disease control must be indirect, perhaps relating to the reduced plant spreading observed in treated plots. The reduction in ground contact is thought to reduce the probability of contacting pathogen inoculum. The potential value of oxadiazon in an integrated pest management system appears to be good because of simultaneous weed and disease control as well as frequent yield increases. This potential may be improved by use of dinoseb in the same program. Disease control is apparently an expression of the direct toxicity of dinoseb and the indirect effects of oxadiazon.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 3 , May 1977 , pp. 260 - 263
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

Literature Cited

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