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Citeable URL: http://ir.library.oregonstate.edu/concern/articles/rf55z9287

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Creator	Reed, Ralph L. Stevens, J. Fred Erşahin, Yurdagul Şimşek Weiland, Jerry E. Zasada, Inga A.
Abstract or Summary	Meadowfoam (Limnanthes alba) is a commercial oilseed annual crop grown in Oregon. After extracting oil from seed, the remaining seed meal is rich in the secondary plant metabolite glucolimnanthin, which can be converted into pesticidal compounds such as 3-methoxybenzyl isothiocyanate (ITC) and 3-methoxyphenylacetonitrile (nitrile) in the presence of the enzyme myrosinase. In previous studies, we demonstrated that ITC and nitrile, produced by mixing freshly ground meadowfoam seed with meadowfoam seed meal, are toxic to the plant-parasitic nematode Meloidogyne hapla and the plant pathogen Pythium irregulare. In this study, we evaluated factors that might influence the implementation of meadowfoam seed meal into agricultural production systems for soilborne pathogen and nematode control. Rate-finding experiments demonstrated that a minimum 1.0% seed/seed meal formulation (wt/wt) was necessary to achieve nematode and pathogen suppression; seed meal alone was insufficient for complete control of M. hapla and stimulated the growth of P. irregulare. When this 1.0% seed/seed meal formulation was used, a greater soil amendment rate was required to cause 100% mortality of P. irregulare (1.0% wt/wt) than for M. hapla (0.5% wt/wt). In phytotoxicity experiments, soil amended with the 1.0% seed/seed meal formulation was consistently phytotoxic to wheat, cucumber, and tomato. However, phytotoxic effects were mitigated by a delayed planting into the amended soil. A final assay to monitor concentrations of ITC and nitrile in conjunction with assessing M. hapla and P. irregulare mortality was conducted over a 6-day period in soils amended at 0.5 and 1.0% (wt/wt) with the 1.0% seed/seed meal formulation. The response was rapid, with 100% mortality of both organisms within 2 h after exposure to amended soil. Concentrations of nitrile remained relatively constant over the 6-day period (approximately 0.017 and 0.032 mg/ml at 0.5 and 1.0% amendment rates, respectively), whereas ITC production increased rapidly and peaked 12 to 24 h after amendment (0.083 and 0.171 mg/ml at 0.5 and 1.0% amendment rates, respectively) before returning to near undetectable levels.
Resource Type	Article
DOI	10.1094/PDIS-09-13-0967-RE
Date Available	2014-10-15T19:10:37+00:00
Date Issued	2014-09
Citation	Erşahin, Y. S., Weiland, J. E., Zasada, I. A., Reed, R. L., & Stevens, J. F. (2014). Identifying Rates of Meadowfoam (Limnanthes alba) Seed Meal Needed for Suppression of Meloidogyne hapla and Pythium irregulare in Soil. Plant Disease, 98(9), 1253-1260. doi:10.1094/PDIS-09-13-0967-RE
Series	Vol. 98 no. 9 Plant Disease
Rights Statement	Copyright Not Evaluated
Funding Statement (additional comments about funding)	Funding for this project was provided by the Republic of Turkey Council of Higher Education and United States Department of Agriculture CRIS 303-5358-12220-003-00D.
Publisher	American Phytopathological Society
Peer Reviewed	Yes
Language	English [eng]
Replaces	http://hdl.handle.net/1957/52984
Additional Information	description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-10-15T19:10:10Z No. of bitstreams: 1 ReedRalphPharmacyIdentifyingRatesMeadowfoam.pdf: 656983 bytes, checksum: c624250cd5f029f7ea5e8aee6a56d53e (MD5) description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-10-15T19:10:37Z (GMT) No. of bitstreams: 1 ReedRalphPharmacyIdentifyingRatesMeadowfoam.pdf: 656983 bytes, checksum: c624250cd5f029f7ea5e8aee6a56d53e (MD5) description.provenance : Made available in DSpace on 2014-10-15T19:10:37Z (GMT). No. of bitstreams: 1 ReedRalphPharmacyIdentifyingRatesMeadowfoam.pdf: 656983 bytes, checksum: c624250cd5f029f7ea5e8aee6a56d53e (MD5) Previous issue date: 2014-09

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