Field Susceptibility of 68 Apple Cultivars to Cedar Apple Rust, Quince Rust and Hawthorn Rust
DOI:
https://doi.org/10.71318/apom.1992.46.1.6Abstract
Apple cultivars were evaluated in a field for susceptibility to cedar apple rust (CAR), quince rust (QR) and hawthorn rust (HR). HR lesions on apple leaves were relatively small and few in number compared to CAR lesions. Between 1986 and 1990, percentage fruit infection varied from 0 to 64 for CAR and from 0 to 42 for QR. ‘Mutsu’ was the most susceptible culitvar to both CAR and QR. Other cultivars highly susceptible to both CAR and QR included ‘Burgundy,’ ‘Gloster 69’ ‘Smoothee Golden Delicious’ ‘Julyred’ and ‘Summerred.’ Susceptibility of the cultivars to rust infection varied from year to year with 1986 having the highest level of infection.
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