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Chemical control of two Phytophthora species infecting the canopy of Monterey pine (Pinus radiata)

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dc.contributor.authorRolando, C.A.
dc.contributor.authorDick, M.A.
dc.contributor.authorGardner, J.
dc.contributor.authorBader, M.K.F.
dc.contributor.authorWilliams, N.M.
dc.contributor.editorScanu, B.
dc.date.issued2017
dc.description.abstractTwelve active ingredients were screened for their ability to control foliage disease caused by Phytophthora kernoviae and Phytophthora pluvialis. Inhibition of mycelial growth and sporangial production of both pathogens were assessed in in vitro assays after exposure to three concentrations of each active ingredient. While most of these active ingredients inhibited mycelial growth in vitro, due to their widespread use, phosphite, copper oxychloride and metalaxyl-M were selected for further study. Four rates of each active ingredient were applied to two Pinus radiata genotypes, and detached needle assays at 6 and 90 days post-treatment were used to determine treatment efficacy and persistence. Untreated needles showed significantly larger lesions than all fungicide-treated needles after exposure to P. pluvialis or P. kernoviae on both sampling dates. Efficacy and persistence of the three active ingredients did not increase with increase in concentration. Larger lesions were formed on more susceptible genotype after inoculation with both Phytophthora species, even when higher rates of active ingredients were applied. Phosphite, copper oxychloride and metalaxyl-M have potential to protect commercially planted P. radiata from these two Phytophthora species.
dc.identifier.citationForest Pathology, 2017; 47(3):1-10
dc.identifier.doi10.1111/efp.12327
dc.identifier.issn1437-4781
dc.identifier.issn1439-0329
dc.identifier.orcidWilliams, N.M. [0000-0003-0493-4954]
dc.identifier.urihttps://hdl.handle.net/11541.2/45244
dc.language.isoen
dc.publisherWiley-Blackwell Verlag GmbH
dc.relation.fundingNew Zealand Forest Owners Association
dc.rightsCopyright 2017 Blackwell Verlag GmbH
dc.source.urihttps://doi.org/10.1111/efp.12327
dc.subjectaerial phosphite spray
dc.subjectcopper hydroxide
dc.subjectfungicides
dc.subjectazoxystrobin
dc.subjectmanagement
dc.subjectcinnamomi
dc.subjectmetalaxyl
dc.subjectrot
dc.subjectdimethomorph
dc.subjectalgaecides
dc.titleChemical control of two Phytophthora species infecting the canopy of Monterey pine (Pinus radiata)
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9917087551401831

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