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| Rust (Pucciniastrum)
True Fir
Disease
Annosus root rot
Armillaria root rot
Current-season needle necrosis
Flowers
Grovesiella canker
Interior needle blight
Needle casts
Phytophthora root rot
Rust (Pucciniastrum)
Rust (Uredinopsis)
Insect
Balsam twig aphid
Balsam woolly adelgid
Coneworms
Giant conifer aphids
Spruce budworm
Spruce spider mite
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Caption: Fir Pucciniastrum rust
Photo by: R.S. Byther
True Fir : Rust (Pucciniastrum)
(revision date: 4/23/2014)
Use Integrated Pest Management (IPM) for successful plant problem management.
Biology
Pucciniastrum rusts are fungal diseases. Yellowish spots or blotches appear on the upper side of infected needles. White, tube-like structures are typically found on the underside of last season's needles in early summer or on current-season needles in late summer or fall. Yellow fungal spores are found inside these structures. Severely infected needles drop from the trees. Alternate hosts for Pucciniastrum goeppertianum include wild blueberry, cranberry, and huckleberry. The berry bushes develop witches' brooms with thickened stems and few leaves when infected. A reddish-brown layer forms around the infected stems. Alternate hosts for P. epilobii are fireweeds. Pucciniastrum rusts affect grand, Pacific silver, noble, balsam, white, red, and subalpine firs. Rust diseases are favored by cool, moist springs. This disease is often confused with Uredinopsis rust.
Management Options
Non-Chemical Management
Remove alternate hosts within approximately 1,000 feet of susceptible trees.
Select non-chemical management options as your first choice!
Chemical Management
IMPORTANT:
Visit Home and Garden Fact Sheets for more information on using pesticides
None recommended
Images
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Caption: Fir Pucciniastrum rust
Photo by: R.S. Byther
Caption: Fir Pucciniastrum rust
Photo by: R.S. Byther
Caption: Pucciniastrum rust on huckleberry
Photo by: R.S. Byther