Abstract
The effects of temperature and wetness duration on infection of sweet cherry (Prunus avium L.) and peach (Prunus persica L.) by Wilsonomyces carpophilus (Lev.) Adaskaveg, Ogawa & Butler were determined under controlled conditions. Young foliage of cherry seedlings and peach trees was inoculated with a conidial suspension of W. carpophilus and subjected to wetness periods of 0–24 h at temperatures of 5–30°C. On cherry, disease severity increased with wetness duration at each temperature tested, e.g., at 15°C, severity increased from no lesions at wetness durations < 1 h to 0.1, 1.9, 6.8, and 9.1 lesions/cm2 after 6, 12, 18, and 24 h, respectively. After 24 h of wetness, the maximum disease severity of 10.5 lesions/cm2 was obtained at 20°C. Although severity values were different, the general responses to temperature and wetness period were similar on peach. Multiple-regression equations using temperature and wetness duration as independent variables adequately described infection of cherry and peach foliage. The incubation period on cherry was 2, 2, and 3 d at 5, 15, and 25°C, respectively, while the latent period was 6 d at 15–25°C.
Published Version
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