Traits of Soybean-Infecting Phytophthora Populations from Illinois Agricultural Fields

Plant Disease
D K Malvick, E Grunden

Abstract

Phytophthora rot caused by Phytophthora sojae is a common and significant disease of soybean (Glycine max) in Illinois and throughout the Midwestern United States. The pathogenic characteristics of P. sojae populations in several Midwestern states have been reported recently, but pathogenicity and fungicide sensitivity traits of populations in Illinois were poorly understood. Isolates (n = 121) of soybean-infecting Phytophthora spp. were baited using susceptible cv. Sloan seedlings from soybean field soils with a history of seedling diseases in 24 counties across Illinois. The pathotype and race of isolates of P. sojae were characterized using 11 differential soybean cultivars in greenhouse tests using a hypocotyl inoculation method. Sensitivity to the fungicidal compounds metalaxyl and mefenoxam was tested with 63 isolates in vitro. Most (96%) of the Phytophthora isolates sampled from Illinois soybean fields were P. sojae, but 4% were an unidentified Phytophthora sp. as determined by phenotypic and genotypic traits. We present a preliminary description of another Phytophthora sp. from soybean fields in a restricted region of Illinois that is pathogenic and capable of killing soybean. Based on eight Rps gene differentials (Rps1...Continue Reading

References

Nov 1, 1993·The Journal of Clinical Endocrinology and Metabolism·E Späth-SchwalbeH L Fehm
Feb 1, 2003·Plant Disease·A E DorranceA deSilva
Oct 1, 2001·Plant Disease·R C KaitanyG R Safir
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Jun 1, 1997·Plant Disease·T S AbneyJ Young

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Citations

Apr 15, 2010·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Xiuping LiWenbin Li
Jul 1, 2016·Plant Disease·A E DorranceV C Concibido
Mar 16, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Feng LinDechun Wang
Jun 30, 2021·Plant Disease·Austin G McCoyMartin I Chilvers

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