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United States Department of Agriculture

Agricultural Research Service

Title: Sensitivity and Resistance of the Toluca Valley Population of Phytophthora Infestans to Fungicides

Authors
item GRUNWALD, NIKLAUS
item Serrano, E. Garay - PICTIPAPA, METEPEC, MX
item Montes, G. Romero - PICTIPAPA, METEPEC, MX
item Olaya, G - SYNGENTA, VERO BCH, FL
item Fry, W. - CORNELL UNIV, ITHACA, NY

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: January 1, 2001
Publication Date: June 1, 2001
Citation: GRUNWALD, N.J., SERRANO, E., MONTES, G., OLAYA, G., FRY, W.E. SENSITIVITY AND RESISTANCE OF THE TOLUCA VALLEY POPULATION OF PHYTOPHTHORA INFESTANS TO FUNGICIDES. PHYTOPATHOLOGY. 91(6):S33. 2001.

Technical Abstract: Distributions of sensitivities to mancozeb, dimethomorph, propamocarb hydrochloride, fluazinam, cymoxanil, metalaxyl, and azoxystrobin fungicides of the sexual Phytophthora infestans population from the Toluca valley were determined on 50 single lesion isolates. Sensitivities (EC-50 distributions) were obtained in radial growth assays on Rye-B agar amended with the respective fungicide at a range of concentrations (0.0, 0.1, 1, 10, and 100 micro g/ml a.i.). Baseline distributions show that the population is most sensitive to azoxystrobin. Exposure of the late blight population in an experimental plot of 5 x 10m to 6 applications of azoxystrobin did not result in a shift of the distribution of EC-50 values.

Last Modified: 9/29/2014
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