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Phytoparasitica

, Volume 16, Issue 1, pp 39–45 | Cite as

Sensitivity ofPhytophthora Infestans to cymoxanil

  • Y. Samoucha
  • Y. Cohen
Article

Abstract

The efficacy of cymoxanil, Pulsan (oxadixyl + mancozeb + cymoxanil, 1:7:0.4) and Sandocur-M (oxadixyl + mancozeb + cymoxanil, 1:7:2) in controlling late blight was examined in potatoes (cv. ‘Alpha’). Nine oxadixyl-sensitive and seven oxadixyl-resistant isolates ofPhytophthora infestons from six countries were tested. ED90 values of cymoxanil ranged between 64 and 467 mg a.i./l. No relationship was observed between sensitivity to cymoxanil and sensitivity to oxadixyl. Isolate S6A (1305) from California was the most sensitive to cymoxanil (ED90 = 64 mg/l), whereas isolate R11 from Israel was the least sensitive (ED90 = 467 mg/l). Most isolates from Israel were less sensitive (ED90 = 151–467 mg/l) than isolates from Switzerland, the Netherlands, Ireland, Mexico or California (ED90 = 64–152 mg/l). Three-way mixtures of cymoxanil with mancozeb and oxadixyl were more inhibitory than cymoxanil alone, regardless of the isolate. Sandocur-M was, for most isolates, more effective than Pulsan. The correlation coefficient between sensitivity to cymoxanil and sensitivity to Sandocur-M was 0.67, while that between cymoxanil and Pulsan was 0.76.

Key Words

Oomycetes systemic fungicides Curzate oxadixyl fungicide mixtures 

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Copyright information

© Springer Science + Business Media B.V. 1988

Authors and Affiliations

  • Y. Samoucha
  • Y. Cohen
    • 1
  1. 1.Dept. of Life SciencesBar-Ilan UniversityRamat GanIsrael

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