plants are carried to white pine trees on cool, moist air currents in late summer or fall. Plate 173 = Life Cycle -- Puccinia graminis. Some rust fungi complete their life cycle on a single kind of host, they are known as autoecious rusts. These spores infect pine needles if moisture is present. (currants/gooseberries). The disease affects both Eastern and Western white pine for part of the disease cycle. The white pine blister rust fungus Cronartium ribicola needs to infect both white pine and a Ribes spp. Spores from infected Ribes spp. This fungus has a complicated life cycle, requiring nearby plants in the genus Ribes for intermediary hosts. Spores of the fungus produced on white pine are blown to alternate host plants in the genus Ribes (gooseberries and currants). ... Cronartium ribicola canker with resinosis in mid-summer, after aeciospore release. Life Cycle: Infecting Pine Needles. 4 (1 = rare 5 = annual) Severity. Ribes plants, like gooseberry and currant , often develop leaf symptoms, but rarely see serious damage from pine blister rust, unlike white pine. Cronartium ribicola Key Wildlife Value: ... pine and sugar pine in Washington and Oregon by 1940. ... (Fig. White pines, especially young trees, and plants belonging to the genus Ribes (currants and gooseberries) are susceptible to the disease. Plate 225 = Diagnostic Characters-1 -- Uredinales: Melampsoraceae. The pathogen causes a canker disease on five-needle pines. • Very lethal to young trees. Infection takes place through needles in the fall. But others require two unrelated hosts for the completion of life cycle, they are called heteroecious rusts. Most Cronartium ribicola … • Alternates host from white pines to Ribes, a genus that includes currents and gooseberries, depending on the stage of the life cycle. White pine infection. plant to complete its life cycle. White pine infection Spores from infected Ribes spp. Courtesy of Robert L. Anderson, USDA Forest Service, Bugwood.org (#0355052). 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. The white pine blister rust fungus Cronartium ribicola requires two different plant hosts to complete its complex life cycle. Symptoms Quinquefolius). Plate 226 = Diagnostic Characters-2 -- Uredinales: Pucciniaceae The rust is a fungus, cronartium ribicola, that requires two host plants to complete it’s life cycle. Plate 224 = Diagnostic Characters-1 -- Uredinales: Pucciniaceae. Numerous species of the genus Ribes are involved in other parts of the disease cycle. Cronartium ribicola Frequency. White Pine Blister Rust (WPBR), caused by the fungus Cronartium ribicola, is one of the most important diseases of white pines (Pinus sect. 5 (1 = very little damage 5 = plants killed) Hosts. Pine blister rust is a fungal disease of white pines caused by Cronartium ribicola. Plate 174 = Telium of Cronartium ribicola. Life cycle: White pine blister rust alternates between five-needle pines and Ribes spp. The tree has a silvery appearance, a fast growth rate and is 100 ft tall and 35 ft wide at maturity. 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. Cronartium ribicola and related taxa are distributed across temperate Asia, Europe, and North America almost everywhere susceptible hosts occur. : Pucciniaceae the fungus produced on cronartium ribicola life cycle pine are blown to alternate host plants the. Rare 5 = plants killed ) hosts L. 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