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  1. Conditions will be favorable for bitter rot. Protect apple fruitlets this week. (Photo: K. Peter)
    News
    2026 Disease Update: Marssonina Blotch, Bitter Rot Risk
    Date Posted 5/11/2026
    Growers will want to monitor conditions closely May 11 – 18. Fire blight incidence is being reported, and will be exacerbated by warm temperatures and rainfall this week. These conditions will also favor Marssonina blotch and bitter rot.
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