Abstract
In vitro studies were carried out to investigate a possible integrated use of chemical and biological means to control the peach twig blight pathogen,Monilinia laxa. Three fungal antagonists ofM. laxa (Penicillium purpurogenum, Penicillium frequentans andEpicoccum nigrum) and six fungicides (vinclozolin, iprodione, thiram, captan, benomyl and thiophanate-methyl) were used in the study. Sensitivity of the fungal isolates to the fungicides was determined in vitro by calculating ED50 values. Benomyl and thiophanate-methyl were the most fungitoxic compounds and captan was the least fungitoxic.M. laxa andP. purpurogenum were the most sensitive to all chemicals tested, whileE. nigrum andP. frequentans presented bigger differences in their sensitivity to chemicals compared toM. laxa. E. nigrum was consistently less sensitive to benomyl (ED50=2.26 ppm), thiophanate-methyl (ED50=9.61 ppm) and vinclozolin (ED50=3.89 ppm) than the other fungi.P. frequentans was less sensitive to captan, vinclozolin, iprodione, thiophanate-methyl and thiram thanM. laxa (8, 7, 5, 4 and 2 times respectively). These results suggest thatE. nigrum andP. frequentans could be successfully used in an integrated control programme that combines biological and chemical methods.
Published Version
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