Evaluation of New Oomycota Fungicides for Management of Phytophthora Root Rot of Citrus in California.
Identifieur interne : 000517 ( Main/Exploration ); précédent : 000516; suivant : 000518Evaluation of New Oomycota Fungicides for Management of Phytophthora Root Rot of Citrus in California.
Auteurs : Wei Hao [États-Unis] ; Morgan A. Gray [États-Unis] ; Helga Förster [États-Unis] ; James E. Adaskaveg [États-Unis]Source :
- Plant disease [ 0191-2917 ] ; 2019.
Descripteurs français
- KwdFr :
- MESH :
- effets des médicaments et des substances chimiques : Phytophthora.
- microbiologie : Citrus, Racines de plante.
- pharmacologie : Fongicides industriels.
- prévention et contrôle : Maladies des plantes.
- Californie.
English descriptors
- KwdEn :
- MESH :
- chemical , pharmacology : Fungicides, Industrial.
- geographic : California.
- drug effects : Phytophthora.
- microbiology : Citrus, Plant Roots.
- prevention & control : Plant Diseases.
Abstract
Phytophthora root rot, caused by several species of Phytophthora, is an important disease of citrus in California and other growing regions. For chemical management, mefenoxam and potassium phosphite have been available for many years, and resistance in Phytophthora spp. has been reported for both compounds. We evaluated the efficacy of the new Oomycota fungicides ethaboxam, fluopicolide, mandipropamid, and oxathiapiprolin, each with a different mode of action, against Phytophthora root rot of citrus in field and greenhouse studies. Root balls of navel orange trees on 'Carrizo citrange' rootstock were inoculated with P. nicotianae at planting in the field in fall 2013. Applications with 11 fungicide treatments were made 5 weeks after planting, in spring and fall 2014, and in spring 2015. Feeder roots and adjacent soil were collected before or after application. All of the new fungicides significantly reduced root rot incidence and Phytophthora soil populations to very low levels as compared with the control starting after the first application. Mefenoxam was only effective when a high label rate was used in the fourth application. Selected treatments also increased tree canopy size, trunk diameter, and fruit yield as compared with the control. A rate comparison with the four new fungicides was initiated in summer 2016 in another field trial using navel orange trees inoculated with P. citrophthora. Minimum effective rates to reduce Phytophthora root rot incidence and pathogen soil populations were determined after one and two applications in fall 2016 and summer 2017, respectively. Greenhouse studies confirmed the efficacy of the new fungicides. Based in part on our studies, fluopicolide recently received a federal and oxathiapiprolin a full registration for use on citrus, and registrations for ethaboxam and mandipropamid have been requested. These new compounds will provide highly effective treatment options and resistance management strategies using rotation and mixture programs for the control of Phytophthora root rot of citrus.
DOI: 10.1094/PDIS-07-18-1152-RE
PubMed: 30789317
Affiliations:
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Adaskaveg</name><affiliation wicri:level="2"><nlm:affiliation>Department of Microbiology and Plant Pathology, University of California, Riverside, CA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><placeName><region type="state">Californie</region></placeName><wicri:cityArea>Department of Microbiology and Plant Pathology, University of California, Riverside</wicri:cityArea></affiliation></author></analytic><series><title level="j">Plant disease</title><idno type="ISSN">0191-2917</idno><imprint><date when="2019" type="published">2019</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>California (MeSH)</term><term>Citrus (microbiology)</term><term>Fungicides, Industrial (pharmacology)</term><term>Phytophthora (drug effects)</term><term>Plant Diseases (prevention & control)</term><term>Plant Roots (microbiology)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Californie (MeSH)</term><term>Citrus (microbiologie)</term><term>Fongicides industriels (pharmacologie)</term><term>Maladies des plantes (prévention et contrôle)</term><term>Phytophthora (effets des médicaments et des substances chimiques)</term><term>Racines de plante (microbiologie)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Fungicides, Industrial</term></keywords><keywords scheme="MESH" type="geographic" xml:lang="en"><term>California</term></keywords><keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Phytophthora</term></keywords><keywords scheme="MESH" qualifier="effets des médicaments et des substances chimiques" xml:lang="fr"><term>Phytophthora</term></keywords><keywords scheme="MESH" qualifier="microbiologie" xml:lang="fr"><term>Citrus</term><term>Racines de plante</term></keywords><keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Citrus</term><term>Plant Roots</term></keywords><keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr"><term>Fongicides industriels</term></keywords><keywords scheme="MESH" qualifier="prevention & control" xml:lang="en"><term>Plant Diseases</term></keywords><keywords scheme="MESH" qualifier="prévention et contrôle" xml:lang="fr"><term>Maladies des plantes</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Californie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Phytophthora root rot, caused by several species of Phytophthora, is an important disease of citrus in California and other growing regions. For chemical management, mefenoxam and potassium phosphite have been available for many years, and resistance in Phytophthora spp. has been reported for both compounds. We evaluated the efficacy of the new Oomycota fungicides ethaboxam, fluopicolide, mandipropamid, and oxathiapiprolin, each with a different mode of action, against Phytophthora root rot of citrus in field and greenhouse studies. Root balls of navel orange trees on 'Carrizo citrange' rootstock were inoculated with P. nicotianae at planting in the field in fall 2013. Applications with 11 fungicide treatments were made 5 weeks after planting, in spring and fall 2014, and in spring 2015. Feeder roots and adjacent soil were collected before or after application. All of the new fungicides significantly reduced root rot incidence and Phytophthora soil populations to very low levels as compared with the control starting after the first application. Mefenoxam was only effective when a high label rate was used in the fourth application. Selected treatments also increased tree canopy size, trunk diameter, and fruit yield as compared with the control. A rate comparison with the four new fungicides was initiated in summer 2016 in another field trial using navel orange trees inoculated with P. citrophthora. Minimum effective rates to reduce Phytophthora root rot incidence and pathogen soil populations were determined after one and two applications in fall 2016 and summer 2017, respectively. Greenhouse studies confirmed the efficacy of the new fungicides. Based in part on our studies, fluopicolide recently received a federal and oxathiapiprolin a full registration for use on citrus, and registrations for ethaboxam and mandipropamid have been requested. These new compounds will provide highly effective treatment options and resistance management strategies using rotation and mixture programs for the control of Phytophthora root rot of citrus.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" IndexingMethod="Curated" Owner="NLM"><PMID Version="1">30789317</PMID><DateCompleted><Year>2019</Year><Month>07</Month><Day>19</Day></DateCompleted><DateRevised><Year>2019</Year><Month>07</Month><Day>19</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0191-2917</ISSN><JournalIssue CitedMedium="Print"><Volume>103</Volume><Issue>4</Issue><PubDate><Year>2019</Year><Month>Apr</Month></PubDate></JournalIssue><Title>Plant disease</Title><ISOAbbreviation>Plant Dis</ISOAbbreviation></Journal><ArticleTitle>Evaluation of New Oomycota Fungicides for Management of Phytophthora Root Rot of Citrus in California.</ArticleTitle><Pagination><MedlinePgn>619-628</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1094/PDIS-07-18-1152-RE</ELocationID><Abstract><AbstractText>Phytophthora root rot, caused by several species of Phytophthora, is an important disease of citrus in California and other growing regions. For chemical management, mefenoxam and potassium phosphite have been available for many years, and resistance in Phytophthora spp. has been reported for both compounds. We evaluated the efficacy of the new Oomycota fungicides ethaboxam, fluopicolide, mandipropamid, and oxathiapiprolin, each with a different mode of action, against Phytophthora root rot of citrus in field and greenhouse studies. Root balls of navel orange trees on 'Carrizo citrange' rootstock were inoculated with P. nicotianae at planting in the field in fall 2013. Applications with 11 fungicide treatments were made 5 weeks after planting, in spring and fall 2014, and in spring 2015. Feeder roots and adjacent soil were collected before or after application. All of the new fungicides significantly reduced root rot incidence and Phytophthora soil populations to very low levels as compared with the control starting after the first application. Mefenoxam was only effective when a high label rate was used in the fourth application. Selected treatments also increased tree canopy size, trunk diameter, and fruit yield as compared with the control. A rate comparison with the four new fungicides was initiated in summer 2016 in another field trial using navel orange trees inoculated with P. citrophthora. Minimum effective rates to reduce Phytophthora root rot incidence and pathogen soil populations were determined after one and two applications in fall 2016 and summer 2017, respectively. Greenhouse studies confirmed the efficacy of the new fungicides. Based in part on our studies, fluopicolide recently received a federal and oxathiapiprolin a full registration for use on citrus, and registrations for ethaboxam and mandipropamid have been requested. These new compounds will provide highly effective treatment options and resistance management strategies using rotation and mixture programs for the control of Phytophthora root rot of citrus.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Hao</LastName><ForeName>Wei</ForeName><Initials>W</Initials><AffiliationInfo><Affiliation>Department of Microbiology and Plant Pathology, University of California, Riverside, CA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Gray</LastName><ForeName>Morgan A</ForeName><Initials>MA</Initials><AffiliationInfo><Affiliation>Department of Microbiology and Plant Pathology, University of California, Riverside, CA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Förster</LastName><ForeName>Helga</ForeName><Initials>H</Initials><AffiliationInfo><Affiliation>Department of Microbiology and Plant Pathology, University of California, Riverside, CA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Adaskaveg</LastName><ForeName>James E</ForeName><Initials>JE</Initials><Identifier Source="ORCID">http://orcid.org/0000-0003-0076-6164</Identifier><AffiliationInfo><Affiliation>Department of Microbiology and Plant Pathology, University of California, Riverside, CA.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2019</Year><Month>02</Month><Day>18</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Dis</MedlineTA><NlmUniqueID>9882809</NlmUniqueID><ISSNLinking>0191-2917</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D005659">Fungicides, Industrial</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D002140" MajorTopicYN="N" Type="Geographic">California</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D002957" MajorTopicYN="Y">Citrus</DescriptorName><QualifierName UI="Q000382" MajorTopicYN="N">microbiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D005659" MajorTopicYN="Y">Fungicides, Industrial</DescriptorName><QualifierName UI="Q000494" MajorTopicYN="N">pharmacology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D010838" MajorTopicYN="Y">Phytophthora</DescriptorName><QualifierName UI="Q000187" MajorTopicYN="N">drug effects</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D010935" MajorTopicYN="Y">Plant Diseases</DescriptorName><QualifierName UI="Q000517" MajorTopicYN="N">prevention & control</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018517" MajorTopicYN="N">Plant Roots</DescriptorName><QualifierName UI="Q000382" MajorTopicYN="N">microbiology</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2019</Year><Month>2</Month><Day>23</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2019</Year><Month>7</Month><Day>20</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2019</Year><Month>2</Month><Day>22</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">30789317</ArticleId><ArticleId IdType="doi">10.1094/PDIS-07-18-1152-RE</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Hao, Wei" sort="Hao, Wei" uniqKey="Hao W" first="Wei" last="Hao">Wei Hao</name></region><name sortKey="Adaskaveg, James E" sort="Adaskaveg, James E" uniqKey="Adaskaveg J" first="James E" last="Adaskaveg">James E. Adaskaveg</name><name sortKey="Forster, Helga" sort="Forster, Helga" uniqKey="Forster H" first="Helga" last="Förster">Helga Förster</name><name sortKey="Gray, Morgan A" sort="Gray, Morgan A" uniqKey="Gray M" first="Morgan A" last="Gray">Morgan A. Gray</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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