Symptoms of red needle cast on Douglas-fir needles
Photo Gallery
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P. pluvialis symptoms  |
P. pluvialis oogonium and antheridium  Oogonium and oospore with amphigynous antheridium |
P. pluvialis sporangium  Sporangium showing typical ovoid shape and semi-papillate condition |
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P. pluvialis on Pinus radiata in New Zealand  A stand of Pinus radiata trees affected by red needle cast disease. Note the reddish appearance of affected trees prior to needle drop. |
P. pluvialis - appearance of new growth  Tufted appearance of new growth from surviving buds on Douglas-fir, one year after defoliation. |
P. pluvialis hyphal swellings  P. pluvialis hyphal swellings in water |
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P. pluvialis on Pinus radiata in New Zealand  A stand of Pinus radiata trees affected by red needle cast disease. Note that frequently only the lower part of the crown is affected. |
P. pluvialis sporangia.  P. pluvialis sporangia on tape peel from infected Douglas-fir needle. |
P. pluvialis on Pinus radiata in New Zealand  Pinus radiata needles showing colour changes following infection with red needle cast disease. The tissues around the initial infection at the base or along the needle senesce, and change yellow and then brown as indicated by the arrows before the needles cast. |
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P. pluvialis sporangium  Sporangia showing typical ovoid shape and semi-papillate condition |
P. pluvialis on Pinus radiata in New Zealand  Typical red needle cast symptoms along a twig. Lesions begin at the base of the needle which subsequently turns brown and is cast from the twig. |
P. pluvialis on Pinus radiata needle  Clusters of sporangia emerge from stomata of an infected radiata pine needle. |