SENSITIVITY OF THE FUNGUS CYTOSPORA-PERSOONII TO THE FLAVONOIDS OF PRUNUS-CERASUS

Bioassays compared mycelial growth of Cytospora persoonii on flavonoid glucosides and aglycones from resistant Prunus cerasus. Apart from the fact that flavonoid aglycones were more toxic than the corresponding glucosides, there was a difference in fungal reaction depending on the flavonoid type. The fungus was much more sensitive to changes in the concentration of the flavanone aglycones than to those of the corresponding glucosides. Apart from differences in the toxicity of the various flavonoids tested, the fungal sensitivity in the case of flavone and isoflavone aglycones was similar to the sensitivity of flavanone glucosides.