Blister Rust Year

1. At least 2 blister rust events must occur during a single season lasting from July 1 to October 15 of a given year.

2. At least 14 days must elapse between the beginning of the first blister rust event and the end of the next blister rust event.

3. No more than 28 days may elapse between the end of 1 blister rust event and the onset of a second blister rust event.

4.If more than 2 blister rust events occur during a given season (lasting from July 1 to October 15), and both criteria 2 and 3 are satisfied for the time period between any of the blister rust events, that year is designated a blister rust year.

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