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The rust is shed from the gooseberry or current plant when the plant naturally drops its leaves in the autumn.

In central Colorado, over 100,000 people a year pay an entrance fee to visit an ancient bristlecone pine forest in a Research National Area.

During the progression of the disease branch death and topkill can significantly reduce cone and seed production and tree vigor.

The pathogen can kill small trees within just a few years.

The severity and rate of infection is not uniform across the landscape; due in part to the biology of the pathogen and the conditions required for successful spore production, transport and germination.

The spores can be damaged by dry air; therefore wet, cool conditions during spore shedding can lead to successful infection.

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