Effect of Early Sprays on Control of Powdery Mildew Fruit Russet on Apples. Robert Daines, Department of Botany and Range Science, Brigham Young University, Provo, UT 84602. D. J. Weber, E. D. Bunderson, and T. Roper, Department of Botany and Range Science, Brigham Young University, Provo, UT 84602. Plant Dis. 68:326-328. Accepted for publication 24 October 1983. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-326.

Powdery mildew fruit infections of apple occur during the pink stage of blossom development and can be prevented by use of an effective fungicide. Etaconazole and dinocap were the most effective fungicides tested in controlling mildew fruit russet. Wettable sulfur and benomyl (in that order) were less effective. Morphological changes in infected flower buds were also noted.