(currants/gooseberries). Plate 224 = Diagnostic Characters-1 -- Uredinales: Pucciniaceae. But others require two unrelated hosts for the completion of life cycle, they are called heteroecious rusts. Most Cronartium ribicola Frequency. Cronartium ribicola Key Wildlife Value: ... pine and sugar pine in Washington and Oregon by 1940. Life cycle: White pine blister rust alternates between five-needle pines and Ribes spp. Plate 226 = Diagnostic Characters-2 -- Uredinales: Pucciniaceae plant to complete its life cycle. plants are carried to white pine trees on cool, moist air currents in late summer or fall. The white pine blister rust fungus Cronartium ribicola needs to infect both white pine and a Ribes spp. Similar to most pine stem rusts, C. ribicola is an obligate parasite of living hosts and has a complex life cycle com-prising multiple spore stages for reproduction, dispersal, and perennial survival. Infection takes place through needles in the fall. The tree has a silvery appearance, a fast growth rate and is 100 ft tall and 35 ft wide at maturity. • Alternates host from white pines to Ribes, a genus that includes currents and gooseberries, depending on the stage of the life cycle. • Very lethal to young trees. Quinquefolius). The rust is a fungus, cronartium ribicola, that requires two host plants to complete it’s life cycle. White pine infection. These spores infect pine needles if moisture is present. Plate 174 = Telium of Cronartium ribicola. Symptoms Courtesy of Robert L. Anderson, USDA Forest Service, Bugwood.org (#0355052). Spores of the fungus produced on white pine are blown to alternate host plants in the genus Ribes (gooseberries and currants). The disease affects both Eastern and Western white pine for part of the disease cycle. Cronartium ribicola … 4 (1 = rare 5 = annual) Severity. This fungus has a complicated life cycle, requiring nearby plants in the genus Ribes for intermediary hosts. Plate 173 = Life Cycle -- Puccinia graminis. ... (Fig. ... Cronartium ribicola canker with resinosis in mid-summer, after aeciospore release. Pine blister rust is a fungal disease of white pines caused by Cronartium ribicola. General Description • Fungus which causes white pine blister rust • Has several host trees but the only host tree in New Jersey is Eastern white pine. Life Cycle: Infecting Pine Needles. The white pine blister rust fungus Cronartium ribicola requires two different plant hosts to complete its complex life cycle. Ribes plants, like gooseberry and currant , often develop leaf symptoms, but rarely see serious damage from pine blister rust, unlike white pine. White pine infection Spores from infected Ribes spp. White Pine Blister Rust (WPBR), caused by the fungus Cronartium ribicola, is one of the most important diseases of white pines (Pinus sect. 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