Plant Bioregulator Strategies to Alleviate Biennial Bearing, Enhance Precocity, and Control Vegetative Growth of 'Northern Spy' Apple Trees

dc.contributor.advisorCline, John A.
dc.contributor.advisorSullivan, J. Alan
dc.contributor.authorDuyvelshoff, Christopher
dc.date.accessioned2011-05-11T13:02:01Z
dc.date.available2011-05-11T13:02:01Z
dc.date.copyright2011-04
dc.date.created2011-04-20
dc.date.issued2011-05-11
dc.degree.departmentDepartment of Plant Agricultureen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.degree.programmePlant Agricultureen_US
dc.description.abstractBiennial bearing, low precocity, and vigorous vegetative growth are major production constraints of ‘Northern Spy’ apple trees. Experiments were conducted in bearing and non-bearing ‘Northern Spy’/M.9 orchards to determine whether plant bioregulator applications of ethephon (ETH), napthaleneacetic acid (NAA), prohexadione-calcium (P-Ca), and/or benzyladenine (BA) could be used to overcome these production constraints of ‘Northern Spy’. Ethephon application at 150, 300, or 450 mg∙L-1 in the ‘on’ year increased return bloom, fruit yield, and alleviated biennial bearing in the ‘off’ year in a positive linear relationship to concentration when trees were moderately biennial in cropping. Applications applied 22 June were more effective than 27 July or 31 Aug. applications. However, single or multiple (2, 3, or 4) application(s) of 150 mg∙L-1 ETH or 5 mg∙L-1 NAA were ineffective when trees were not biennial. Two ETH applications at 1500 mg∙L-1 to non-bearing trees significantly increased flowering and fruit yield the year following treatment. The combination of P-Ca with ETH had an additive effect on shoot growth and improved growth control compared to P-Ca alone. Two BA applications at 500 mg∙L-1 had no effect on lateral branching of young trees.en_US
dc.description.sponsorshipChudleigh's Limited
dc.description.sponsorshipMITACS Accelerate
dc.identifier.urihttp://hdl.handle.net/10214/2679
dc.language.isoenen_US
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectAppleen_US
dc.subjectMalusen_US
dc.subject'Northern Spy'en_US
dc.subjectBiennial bearingen_US
dc.subjectPrecocityen_US
dc.subjectVegetative growthen_US
dc.subjectBranchingen_US
dc.subjectEthephonen_US
dc.subjectNapthaleneacetic aciden_US
dc.subjectProhexadione-calciumen_US
dc.subjectBenzyladenineen_US
dc.titlePlant Bioregulator Strategies to Alleviate Biennial Bearing, Enhance Precocity, and Control Vegetative Growth of 'Northern Spy' Apple Treesen_US
dc.typeThesisen_US

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