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Journal of Environmental Science and Health, Part B
Pesticides, Food Contaminants, and Agricultural Wastes
Volume 47, 2012 - Issue 5
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ARTICLES

Toxicity of metalaxyl, azoxystrobin, dimethomorph, cymoxanil, zoxamide and mancozeb to Phytophthora infestans isolates from Serbia

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Pages 403-409 | Received 04 Apr 2011, Published online: 16 Mar 2012
 

Abstract

A study of the in vitro sensitivity of 12 isolates of Phytophthora infestans to metalaxyl, azoxystrobin, dimethomorph, cymoxanil, zoxamide and mancozeb, was conducted. The isolates derived from infected potato leaves collected at eight different localities in Serbia during 2005–2007. The widest range of EC50 values for mycelial growth of the isolates was recorded for metalaxyl. They varied from 0.3 to 3.9 μg mL−1 and were higher than those expected in a susceptible population of P. infestans. The EC50 values of the isolates were 0.16–0.30 μg mL−1 for dimethomorph, 0.27–0.57 μg mL−1 for cymoxanil, 0.0026–0.0049 μg mL−1 for zoxamide and 2.9–5.0 μg mL−1 for mancozeb. The results indicated that according to effective concentration (EC50) the 12 isolates of P. infestans were sensitive to azoxystrobin (0.019–0.074 μg mL−1), and intermediate resistant to metalaxyl, dimethomorph and cymoxanil. According to resistance factor, all P. infestans isolates were sensitive to dimethomorph, cymoxanil, mancozeb and zoxamide, 58.3% of isolates were sensitive to azoxystrobin and 50% to metalaxyl. Gout's scale indicated that 41.7% isolates were moderately sensitive to azoxystrobin and 50% to metalaxyl.

Acknowledgment

This study was carried out as a part of project 31043 financially supported by the Ministry of Education and Science of the Republic of Serbia.

Notes

aRegression coefficient.

b95% confidence interval (P = 0.05).

aRegression coefficient.

b95% confidence interval (P = 0.05).

aRegression coefficient.

b95% confidence interval (P = 0.05).

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