blister rust fungus
Quick Summary
Blister rust is a disease affecting pine trees, caused by rust fungi from the genus Cronartium. This disease is found globally and can be lethal to pines of all ages, weakening them and making them susceptible to bark beetles. A particularly virulent form, white pine blister rust, introduced from China, has significantly impacted five-needled pines in North America.12
The fungus infects the sapwood and inner bark, creating external blisters that release spores. These blisters are often accompanied by oozing resin, forming hardened masses on the tree trunk. While young trees are killed more rapidly, the disease retards growth and weakens stems in older trees as well.1
Control measures include planting resistant pine varieties, maintaining strict sanitation, and using fungicides. Because the fungi require an alternate host to spread from pine to pine, efforts have been made to eradicate nearby host plants, though these have had limited success. Rust diseases, in general, are caused by over 7,000 species of fungi and typically appear as powdery pustules on plants, reducing growth and productivity.13
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ribesPhysical description…alternative hosts of the destructive blister rust fungus, which also attacks white pines, there are local prohibitions to growing Ribes near any white pine plantations.
Read More…alternative hosts of the destructive blister rust fungus, which also attacks white pines, there are local prohibitions to growing Ribes near any white pine plantations.
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SaxifragalesMajor families…parasitic fungus that causes white-pine blister rust, an extremely destructive forest disease found especially in the United States and Canada. Fungal spores that germinate on Ribes plants are blown to the pines, where the disease eventually kills the trees. In North America, eradication and strict controls have severely limited the…
Read More…parasitic fungus that causes white-pine blister rust, an extremely destructive forest disease found especially in the United States and Canada. Fungal spores that germinate on Ribes plants are blown to the pines, where the disease eventually kills the trees. In North America, eradication and strict controls have severely limited the…
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rust…other; white pine rust (Cronartium ribicola), with five-needled pines as one host and currant and gooseberry (Ribes) species as the other; and a rust (Melampsora medusae) with Douglas fir as one host and poplars as the other. Autoecious rusts include those that attack asparagus, bean,
Read More…other; white pine rust (Cronartium ribicola), with five-needled pines as one host and currant and gooseberry (Ribes) species as the other; and a rust (Melampsora medusae) with Douglas fir as one host and poplars as the other. Autoecious rusts include those that attack asparagus, bean,
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…pine blister rust, caused by C. ribicola, is a virulent disease that was introduced from China to North America around 1900. The disease affects five-needled pine species, commonly known as white pines, and has depleted stands across North America.
Read More…pine blister rust, caused by C. ribicola, is a virulent disease that was introduced from China to North America around 1900. The disease affects five-needled pine species, commonly known as white pines, and has depleted stands across North America.
Read More