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Stigmina needle blight (Stigmina spp.) on Spruce, Colorado (Picea pungens)


9 Images

Paul Bachi
University of Kentucky Research and Education Center

Off-colored needles usually older than the current year's needles.


Paul Bachi
University of Kentucky Research and Education Center

Off-colored needles usually older than the current year's needles.


Paul Bachi
University of Kentucky Research and Education Center

Close-up of several symptomatic needles. Note yellow flecking on needles is due to mite injury.


Paul Bachi
University of Kentucky Research and Education Center

Needle showing fuzzy, black tufts rising from stomata which are not as well defined as with the needle cast disease caused by the fungus Rhizosphaera. Note yellow flecking on needles is due to mite injury.


Paul Bachi
University of Kentucky Research and Education Center

Closer view of needle showing fuzzy, black tufts rising from stomata which are not as well defined as with the needle cast disease caused by the fungus Rhizosphaera. Note yellow flecking on needles is due to mite injury.


Paul Bachi
University of Kentucky Research and Education Center

Closest view of needle showing fuzzy, black tufts rising from stomata which are not as well defined as with the needle cast disease caused by the fungus Rhizosphaera. Note yellow flecking on needles is due to mite injury.


Paul Bachi
University of Kentucky Research and Education Center

View of several dark brown, spore-producing bodies ("conidiophores") and brown, multi-celled spores.


Paul Bachi
University of Kentucky Research and Education Center

Closer view of several dark brown spore-producing bodies ("conidiophores") and brown, multi-celled spores.


Paul Bachi
University of Kentucky Research and Education Center

View of two clumps of conidiophores and many brown, multi-celled spores.