Apple Cultivar Sensitivity to Azoxystrobin Fungicide
DOI:
https://doi.org/10.71318/apom.2003.57.4.166Abstract
Apple cultivar sensitivity to azoxystrobin fungicide was evaluated over two years. A single application of azoxystrobin at 200 ppm concentration was applied to selected shoots of over fifty different apple cultivars and rootstocks. Treated shoots were then evaluated for phytotoxicity four to seven days later. Cultivars that showed symptoms in one or both years included 'Braeburn', BC 8S-26-50, 'Gala', 'GoldRush', 'Hampshire', 'Jonamac', NY 75414-1, NY 65707-19, NY 75907-72, 'Silken', 'Spigold', 'Suncrisp' and 'Zestar!' Of the rootstocks tested, only CG.179 and EMLA.26 exhibited phytotoxicity on treated leaves. Cultivars that were not injured by azoxystrobin in either year were 'Arlet', 'Carousel', 'Creston', 'Enterprise', 'Fortune', 'Fuji', 'Gala Supreme', 'Ginger Gold', 'Orin', 'Pristine', 'Rome Beauty', 'Sansa', 'Shizuka', 'Yataka', and 'York Imperial'.
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