Incidence of White Pine Blister Rust in Maine After 70 Years of a Ribes Eradication Program

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Abstract
Effectiveness of a Ribes eradication program for control of white pine blister rust was evaluated by comparing the incidence of the disease of areas never treated for Ribes with areas from which Ribes were regularly eradicated over the plast 70 years. White pine stands were sampled to determine the effect of treatment (whether or not Ribes were controlled), tree size class, and hazard rating on disease incidence. Disease incidence, as measured by the number of infected trees, is lower (3.8%) in areas treated for Ribes compared with areas with no treatment (9.1%). Rust incidence is lowest in reproduction stands, and highest in pole stands. Hazard zone ratings did not reflect disease levels. Survey results indicate that a significant reduction in the incidence of white pine blister rust on a statewide level has been achieved through the Ribes control effort.

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