pest alert white pine blister rust - nh.gov · white pine blister rust cronartium ribicola pest...

White Pine Blister Rust Cronartium ribicola PEST ALERT Hosts: Five-needle pines including White Pine (Pinus strobus) in the northeast and Currants & Gooseberries (Ribes spp.) Distribution: Throughout all the states along the Atlantic seacoast inland to Tennessee and up through the upper Midwest. Also along the Pacific Seacoast inland to South Dakota and down to New Mexico. History: Introduced to North America from Europe in the 1890s, thousands of foresters and laborers spent millions of hours destroying gooseberries and currant plants throughout NH from 1917 to 1986 . This monumental effort was designed to break the disease cycle and by the mid 1990s the occurrence of blister rust damage in the northeast was relatively rare. Much research had gone into developing immune Ribes cultivars. By 2000 a short list of 19 gooseberries and currants were available to legally plant in NH if you provided the State with information on what species and cultivar you purchased off the list and where it was being planted. In 2011 scientists in Connecticut documented the occurrence of Cronartium infected Ribes nigrum cv. Titania, one of the immune cultivars. Subsequent research proved a breakdown of immunity in this cultivar and led to the removal of immune black currants from the varieties approved for planting in NH. Identifying Symptoms: Signs of the disease are visible on Ribes species in the summer and fall when rust colored uredia and telia are present on the undersides of leaves. On pine symptoms first appear as the disease infects the needles in the fall. The infection is most apparent by recently killed branch flagging and stem cankers early summer when orange aecia rupture the bark. Life Cycle: Symptomatic Pines State of New Hampshire Department of Resources and Economic Development Division of Forests and Lands Forest Protection Bureau–Forest Health Section Funded in Cooperation by USDA Forest Service Northeastern Area USDA is an equal opportunity employer and provider USDA Forest Service Symptomatic Ribes Isabel Munck, USDA Forest Service Isabel Munck Isabel Munck

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White Pine Blister RustCronartium ribicola

PEST ALERT

Hosts: Five-needle pines including White Pine (Pinus strobus) in the northeast and Currants & Gooseberries (Ribes spp.)

Distribution: Throughout all the states along the Atlantic seacoast inland to Tennessee and up through the upper Midwest. Also along the Pacific Seacoast inland to South Dakota and down to New Mexico.

History: Introduced to North America from Europe in the 1890s, thousands of foresters and laborers spent millions of hours destroying gooseberries and currant plants throughout NH from 1917 to 1986 . This monumental effort was designed to break the disease cycle and by the mid 1990s the occurrence of blister rust damage in the northeast was relatively rare. Much research had gone into developing immune Ribes cultivars. By 2000 a short list of 19 gooseberries and currants were available to legally plant in NH if you provided the State with information on what species and cultivar you purchased off the list and where it was being planted. In 2011 scientists in Connecticut documented the occurrence of Cronartiuminfected Ribes nigrum cv. Titania, one of the immune cultivars. Subsequent research proved a breakdown of immunity in this cultivar and led to the removal of immune black currants from the varieties approved for planting in NH.

Identifying Symptoms: Signs of the disease are visible on Ribes species in the summer and fall when rust colored uredia and telia are present on the undersides of leaves. On pine symptoms first appear as the disease infects the needles in the fall. The infection is most apparent by recently killed branch flagging and stem cankers early summer when orange aecia rupture the bark.

Life Cycle:

Symptomatic Pines

State of New HampshireDepartment of Resources and Economic DevelopmentDivision of Forests and LandsForest Protection Bureau–Forest Health Section

Funded in Cooperation by USDA Forest Service Northeastern AreaUSDA is an equal opportunity employer and provider USDA Forest Service

Symptomatic RibesIsabel Munck, USDA Forest Service

Isabel Munck Isabel Munck

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