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Early blight fungicide table

Updated 18 February 2016.

Efficacy of fungicides for the control of early blight caused by Alternaria solani and Alternaria alternata.

Product

Efficacy

azoxystrobin4

fluazinam

metiram/mancozeb1

propineb

chlorothalonil

famoxadone4+cymoxanil

fenamidone4+mancozeb or propamocarb2

zoxamide+mancozeb

pyraclostrobin4 + boscalid5

difenoconazole + mandipropamid

difenoconazole3

+++(+)

 (+)

 ++

 ++

 +(+)

 ++

 ++

 ++(+)

 +++(+)

 +++

 +++


Key to ratings : 0 = no effect ; +  = some effect;  ++ =reasonable effect ; +++ = good effect ; ++++ very good effect

  • 1 This rating applies to products containing mancozeb when used at the highest dose rates (>1500g/ha). This rating may not be appropriate where the rate of mancozeb used is lower, particularly where the second active substance is not effective against Alternaria.
  • 2 In some trials there were indications that the rating was ++(+).
  • 3 In some trials there were indications that the rating was +++(+).
  • 4 Alternaria solani isolates that are less sensitive to QoI-fungicides have been isolated from potato plants in Europe. Therefore resistance management strategies should be implemented (see FRAC web site for details).
  • 5 Alternaria solani isolates that are less sensitive to SDHI-fungicides have been isolated from potato plants in some Western European countries. Therefore resistance management strategies should be implemented (see FRAC web site for details.

Ratings will be lower where fungicide insensitive strains are present.

Disclaimer: this is given in the text of the paper from the Limassol and Brasov Workshop.

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Revised 19.02.2016