Fir-fireweed
rust, Pucciniastrum
epilobii
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Fig.
214
Blisters containing white or yellow spores.
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Fig.
215
Current growth killed due to infection.
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Distribution: Throughout
the range of its hosts in B.C.
Host Susceptibility: Amabilis
fir, white fir, and sub-alpine fir of all ages are susceptible, though
it is most serious in young stands. Fireweed is an alternate
host.
Signs & Symptoms: Small blisters filled with white or
yellow spores develop on the lower side of current-year needles in
late spring to early summer. The infected needles become chlorotic or
discoloured and may be shed prematurely.
Damage: Severe infection can almost completely defoliate
current-year needles. Growth reduction may result. Mortality has
occurred in young stands growing in recently logged areas where
fireweed is abundant.
Can Be Confused With: Several other needle rusts are
found on true firs, and could be confused with fir-fireweed rust.
Examination of the spores and the location of the damage will
differentiate these rusts.
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