Spruce cone rusts

Spruce cone rusts - <em>Chrysomyxa pirolata</em> aeciospores produced beneath the cone scales of spruce cones
  • Latin name: Chrysomyxa monensis Ziller
  • French name: Rouilles des cônes de l'épinette
  • Division: Basidiomycota
  • Class: Uredinales
Description

Micro-habitat(s)

Cone

Distribution

Western Canada

Damage, symptoms and biology

These rusts periodically damage cones in localized forest areas and can be a serious problem in spruce seed orchards.

Other information

Seeds are not usually formed in diseased cones, and even when they are produced, malformation and resinosis of the cones hinder seed dispersal or extraction. Those seeds that are formed tend to weigh less and have poor germination.

Canadian Forest Service Publications

Spruce cone rusts

Information on host(s)

Main host(s)

Sitka spruce

Photos
  • Spruce cone rusts Chrysomyxa pirolata aeciospores produced beneath the cone scales of spruce cones
  • Spruce cone rusts Chrysomyxa pirolata aeciospores produced beneath the cone scales of spruce cones
  • Spruce cone rusts Chrysomyxa pirolata aeciospores produced beneath the cone scales of spruce cones
  • Spruce cone rusts Chrysomyxa pirolata uredinia on the lower surface of a wintergreen leaf
  • Spruce cone rusts Orange-yellow urediniospores produced in uredinial pustules
  • Spruce cone rusts Chrysomyxa pirolata urediniospores
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