Colony morphology on carrot agar at 20 days
Photo Gallery
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P. pluvialis colony morphology on carrot agar  |
P. pluvialis oogonium and antheridium  Oogonium and oospore with amphigynous antheridium |
P. pluvialis - appearance of new growth  Tufted appearance of new growth from surviving buds on Douglas-fir, one year after defoliation. |
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P. pluvialis symptoms on Douglas-fir  Red needle cast symptoms on Douglas-fir in western Oregon, 2015 |
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 on Pinus radiata in New Zealand  A Pinus radiata needle showing faded olive- or khaki- coloured lesions consistent with the presence of red needle cast disease. Arrow shows resinous bands within the extended olive lesion. |
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P. pluvialis hyphal swellings  P. pluvialis hyphal swellings on agar |
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 symptoms on Douglas-fir  P. pluvialis symptoms of red needle cast on Douglas-fir, western Oregon 2015 |
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P. pluvialis sporangium  Sporangia showing typical ovoid shape and semi-papillate condition |
P. pluvialis symptoms  Symptoms of red needle cast on Douglas-fir needles |
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. |