Efficacy of fungicides to control early blight: results of EuroBlight experiments to calculate decimal ratings
Early blight is becoming an increasing problem in potato crops. Early blight is caused by Alternaria species, predominantly A. solani. In agricultural practice, early blight is controlled by applying fungicides in the second half of the season. Up until July 2017 the ratings of the fungicides to control early blight were based upon expert judgement from independent researchers. At the EuroBlight workshop in Brasov it was proposed that decimal ratings for fungicides for the efficacy table should be calculated after field experiments have been carried out over two years in three European countries, in accordance with the agreed experimental protocol. Ratings for fungicides with specific activity against Alternaria were tested using a 14-day spray interval whereas late blight fungicides with such activity were sprayed at 7-day intervals. Furthermore, some control strategies that used both groups of fungicide were also included. In July 2017 the first decimal ratings were published on the EuroBlight web site. This paper describes the set-up of the trials and the procedure for awarding a decimal rating.
Other Titles/Title of Conference
Sixteenth EuroBlight Workshop, Aarhus, Denmark
Stichting Wageningen Research
PAGV - Special Report No.18