Dieback of Juglans regia caused by Phytophthora cactorum
Photo Gallery
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Phytophthora cactorum disease symptoms on English walnut |
P. cambivora colony morphology on PDA Appressed colony morphology at 14 days at 20°C on PDA |
P. cambivora disease symptoms Dead and dying chinquapin infected with P. cambivora |
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P. ramorum sporangium Deciduous sporangium, photo from Q-bank, used with permission |
P. nicotianae colony morphology on PDA Phytophthora nicotianae CBS 321.49 PDA after 7 days at 24 degrees. Photo from Q-bank: www.q-bank.eu, Henk Brouwer (CBS-KNAW, Utrecht, The Netherlands) |
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 symptoms on Douglas-fir needles Symptoms of red needle cast on Douglas-fir needles |
P. pseudosyringae sporangium Ovoid, semipapillate sporangia showing medium length pedicel |
P. cambivora oogonium P. cambivora oogonium with antheridium |
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Growth morphology on V8 of P. lateralis Colony morphology on V8 at 14 days |
P. ramorum colony morphology on CMA PARP P. ramorum colony morphology on CMA PARP |
P. tentaculata oogonia and antheridia Oospores and oogonia with mostly paragynous but some amphigynous antheridia of P. tentaculata |


