Proof of Concept for Shoot Blight and Fire Blight Canker Management with Postinfection Spray Applications of Prohexadione-Calcium and Acibenzolar-S-Methyl in Apple

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dc.contributor.authorAćimović, Srđan G.en
dc.contributor.authorMeredith, Christopher L.en
dc.contributor.authorSantander, Ricardo Delgadoen
dc.contributor.authorKhodadadi, Fatemehen
dc.date.accessioned2022-01-03T18:07:52Zen
dc.date.available2022-01-03T18:07:52Zen
dc.date.issued2021-12-03en
dc.date.updated2022-01-03T18:07:50Zen
dc.description.abstractTo reduce the severity of shoot blight and prevent the resulting development of cankers on perennial apple wood, we evaluated eight fire blight postinfection spray programs of prohexadione-calcium (PCA) alone or with acibenzolar-<i>S</i>-methyl (ASM) over 2 years. On mature trees of cultivar Royal Court, a single application of the high PCA rate (247 mg/liter) at 2 to 3 days after inoculation resulted in 89.5 and 69.5% reduction of shoot blight severity after inoculation. Two applications of PCA 247 mg/liter 12 or 14 days apart, with the first one applied 2 to 3 days after inoculation, resulted in 78.8 and 74.5% reduction of shoot blight severity in both years. A 100% control of canker incidence on perennial wood from infected shoots in both years was achieved with a single application of PCA (247 mg/liter) applied at 2 or 3 days after the inoculation, and three applications of PCA (125 mg/liter) + ASM (25 mg/liter) 12 to 16 days apart reduced canker incidence by 83.5 and 69% in the 2 years. The other programs with lower PCA rates and frequencies of application reduced shoot blight severity 50.8 and 51.8% (PCA) and 62.6 to 72% and 59.3% (PCA + ASM) over 2 years, respectively. Reduction of canker incidence on wood by the other programs was 66.5% and 69 to 90.4% in the two years, respectively. As fire blight cankers lead to death of dwarf apple trees and serve as primary sources of inoculum, our effective PCA and PCA + ASM programs could serve as viable postinfection management options. These treatments can reduce or prevent canker development and thus significantly abate tree losses in high-density apple orchards after fire blight epidemics occur.en
dc.description.versionAccepted versionen
dc.format.extentPages PDIS08201744REen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1094/pdis-08-20-1744-reen
dc.identifier.eissn1943-7692en
dc.identifier.issn0191-2917en
dc.identifier.orcidAćimović, Srđan G. [0000-0002-0710-2339]en
dc.identifier.pmid34232052en
dc.identifier.urihttp://hdl.handle.net/10919/107315en
dc.language.isoenen
dc.publisherScientific Societiesen
dc.relation.urihttps://www.ncbi.nlm.nih.gov/pubmed/34232052en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectErwinia amylovoraen
dc.subjectacibenzolar-S-methylen
dc.subjectfire blighten
dc.subjectpost-infection controlen
dc.subjectprohexadione-calciumen
dc.subjectrescue treatmenten
dc.subjectshoot blighten
dc.subject0605 Microbiologyen
dc.subject0607 Plant Biologyen
dc.subject0703 Crop and Pasture Productionen
dc.subjectPlant Biology & Botanyen
dc.titleProof of Concept for Shoot Blight and Fire Blight Canker Management with Postinfection Spray Applications of Prohexadione-Calcium and Acibenzolar-<i>S</i>-Methyl in Appleen
dc.title.serialPlant Diseaseen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJournal Articleen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciencesen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/Alson H. Smith, Jr. ARECen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/CALS T&R Facultyen

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