Sensitivity of North American Isolates of Phytophthora erythroseptica and Pythium ultimum to Mefenoxam (Metalaxyl)

Plant Disease
R J TaylorN C Gudmestad

Abstract

A 4-year study (1997 to 2000) was conducted to determine the sensitivities of the potato tuber rot pathogens, Phytophthora erythroseptica and Pythium ultimum, to mefenoxam (metalaxyl). A total of 2,277 tubers showing symptoms of "water rot" were collected from 16 states and 2 Canadian provinces. From these, 849 isolates of P. erythroseptica and 213 isolates of P. ultimum were obtained, and 805 and 190 isolates, respectively, were tested for their ability to grow on V8 medium amended at 0.01 to 100 μg/ml with fungicide. Isolates ranged widely in their responses to mefenoxam. The presence of resistant isolates (EC50 > 100 μg ml-1) of P. erythroseptica in the potato producing areas of Maine was confirmed. The presence of P. erythroseptica isolates in Idaho and Minnesota resistant to mefenoxam is reported for the first time. The proportion of P. erythroseptica isolates resistant to mefenoxam varied from 2.9 to 36.2% between 1997 and 2000. The proportion of resistant P. ultimum isolates represented only a small proportion of the isolates tested (3.7%). A single resistant P. ultimum isolate was recovered from Washington, whereas most of the resistant isolates obtained (5 of 7) were collected in Minnesota during the final year of the ...Continue Reading

Citations

Nov 1, 2017·Plant Disease·D R RossmanM I Chilvers
Oct 1, 2011·Plant Disease·Carla D GarzónGary W Moorman
Feb 26, 2019·Frontiers in Microbiology·He JiangJianjun Hao
Mar 1, 2016·Plant Disease·Johanna Del Castillo Múnera, Mary K Hausbeck
Jun 24, 2018·Pesticide Biochemistry and Physiology·Zhihui ZhangChangjun Chen
Apr 14, 2005·Journal of Agricultural and Food Chemistry·María C CarpinellaSara M Palacios

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