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Host Range Characterization of Phytophthora sansomeana Across Corn, Soybean, Wheat, Winter Cereal Rye, Dry Bean, and Oats and an In Vitro Assessment of Seed Treatment Sensitivity.
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- Author(s): McCoy AG;McCoy AG; Jacobs JL; Jacobs JL; Chilvers MI; Chilvers MI
- Source:
Plant disease [Plant Dis] 2024 Sep; Vol. 108 (9), pp. 2710-2721. Date of Electronic Publication: 2024 Aug 20.- Publication Type:
Journal Article- Language:
English - Source:
- Additional Information
- Source: Publisher: American Phytopathological Society Country of Publication: United States NLM ID: 9882809 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0191-2917 (Print) Linking ISSN: 01912917 NLM ISO Abbreviation: Plant Dis Subsets: MEDLINE
- Publication Information: Original Publication: St. Paul, Minn. : American Phytopathological Society, [1980]-
- Subject Terms: Phytophthora*/drug effects ; Phytophthora*/physiology ; Phytophthora*/genetics ; Plant Diseases*/microbiology ; Plant Diseases*/prevention & control ; Secale*/microbiology ; Zea mays*/microbiology ; Avena*/microbiology ; Triticum*/microbiology ; Seeds*/microbiology ; Glycine max*/microbiology; Host Specificity ; Fungicides, Industrial/pharmacology ; Strobilurins/pharmacology ; Plant Roots/microbiology ; Virulence ; Crops, Agricultural/microbiology ; Michigan ; Seedlings/microbiology ; Biomass ; Carbamates/pharmacology ; Pyridines ; Benzamides ; Alanine/analogs & derivatives ; Hydrocarbons, Fluorinated ; Pyrazoles
- Abstract: Formally described in 2009, Phytophthora sansomeana is a pathogen of increasing interest in native, agricultural, and horticulturally important plant species. The objective of this study was to elucidate the symptomatic and asymptomatic host range of P. sansomeana on six agricultural crop species commonly used in field crop rotations in Michigan. In addition, sensitivity to oomicides commonly used in seed treatments, including oxathiapiprolin, mefenoxam, ethaboxam, and pyraclostrobin, was performed to aid in disease management recommendations. Plant biomass, quantity of P. sansomeana DNA in roots, and reisolations were used to assess pathogenicity and virulence of 18 isolates of P. sansomeana on each plant species using an inoculated seedling growth chamber assay. Isolates displayed varying levels of virulence to the hosts tested. Reisolations were completed for each plant species tested, and varying quantities of P. sansomeana DNA were found within all plant species root samples. Corn, wheat, soybean, dry bean, and winter cereal rye plants were symptomatic hosts with significant reduction observed in the total plant biomass. No significant reduction in total plant biomass was observed in oats, and oat roots harbored the least amount of P. sansomeana DNA. No P. sansomeana isolates were insensitive to the oomicide compounds tested with mean absolute inhibition (EC
50 ) values of fungicide required for 50% growth inhibition values of 7.8 × 10 -2 μg/ml for mefenoxam, 1.13 × 10 -1 μg/ml for ethaboxam, 2.6 × 10 -2 μg/ml for oxathiapiprolin, and 3.04 × 10 -1 μg/ml for pyraclostrobin. These results suggest that common crop rotations in Michigan may not be a viable option to reduce soilborne inoculum accumulation and oomicide seed treatments could be considered for early-season management of P. sansomeana .
Competing Interests: The author(s) declare no conflict of interest. - Contributed Indexing: Keywords: EC(50); cover crops; crop rotation; emerging pathogen; field crops; fungicide sensitivity; phenotype
- Accession Number: 0 (Fungicides, Industrial)
DJW8M9OX1H (pyrachlostrobin)
F1Q54ONN4H (mefenoxam)
56498AIV8R (oxathiapiprolin)
0 (Strobilurins)
F0VT7K5302 (N-(2-(3-chloro-5-(trifluoromethyl)-2-pyridyl)ethyl)-alpha,alpha,alpha-trifluoro-o-toluamide)
0 (Carbamates)
0 (Pyridines)
0 (Benzamides)
OF5P57N2ZX (Alanine)
0 (Hydrocarbons, Fluorinated)
0 (Pyrazoles) - Publication Date: Date Created: 20240411 Date Completed: 20240924 Latest Revision: 20240924
- Publication Date: 20240925
- Accession Number: 10.1094/PDIS-11-23-2303-RE
- Accession Number: 38600772
- Source:
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