VARIATION IN THE SENSITIVITY OF ISOLATES OF VENTURIA INAEQUALIS (CKE.) WINT. TO FUNGICIDES

Abstract

Fifty isolates of Venturia inaequalis, from diseased apples of several varieties collected in sprayed orchards on various fungicide programs and in unsprayed orchards, were tested for their sensitivity to captan, glyodin, dichlone, phenyl mercury acetate, copper sulphate and sulphur. The isolates were sensitive to a wider dosage range of sulphur than of other fungicides but there was no indication that, in nature, V. inaequalis had developed strains resistant to the fungicides.