Spruce-Labrador tea needle rust

Spruce-Labrador tea needle rust - Fruiting bodies of <em>Chrysomyxa ledicola</em> on a spruce needle. Note the orange color of the spore mass and the torn pustules, indicating the spores are ready to be released.
  • Latin name: Chrysomyxa ledicola Lagerh.
  • French name: Rouille des aiguilles de l'épinette et du thé du Labrador
  • Division: Basidiomycota
  • Class: Uredinales
Description

Micro-habitat(s)

Twig, Needle, Leaf

Distribution

Canada

Damage, symptoms and biology

Severe defoliation of spruce occurs in localized areas, particularly when moist environmental conditions prevail, and can reduce the growth of infected trees.

Other information

A similar rust on spruce, small-spored spruce-Labrador tea rust, caused by Chrysomyxa ledi de Bary var. ledi, differs from C. ledicola in that its aeciospores are smaller (13.5 to 25 x 18 to 32 µm) and that uredinia form on the lower surface of Ledum leaves.

Canadian Forest Service Publications

Spruce-Labrador tea needle rust

Information on host(s)

Main host(s)

Black spruce, Engelmann spruce, Labrador tea, red spruce, Sitka spruce, white spruce

Photos
  • Spruce-Labrador tea needle rust Chrysomyxa ledicola aecia on spruce needles
  • Spruce-Labrador tea needle rust Chrysomyxa ledicola aecia on spruce needles
  • Spruce-Labrador tea needle rust Chrysomyxa ledicola uredinia on the upper surface of Labrador-tea leaves
  • Spruce-Labrador tea needle rust Fruiting bodies of Chrysomyxa ledicola on a spruce needle. Note the orange color of the spore mass and the torn pustules, indicating the spores are ready to be released.
  • Spruce-Labrador tea needle rust Labrador tea leaf, an alternate host of the spruce needle rust fungi, with fruiting of Chrysomyxa ledicola.
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