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

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dc.contributor.advisor Cline, John A.
dc.contributor.advisor Sullivan, J. Alan
dc.contributor.author Duyvelshoff, Christopher
dc.date.accessioned 2011-05-11T13:02:01Z
dc.date.available 2011-05-11T13:02:01Z
dc.date.copyright 2011-04
dc.date.created 2011-04-20
dc.date.issued 2011-05-11
dc.identifier.uri http://hdl.handle.net/10214/2679
dc.description.abstract Biennial 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.sponsorship Chudleigh's Limited, MITACS Accelerate en_US
dc.language.iso en en_US
dc.subject Apple en_US
dc.subject Malus en_US
dc.subject 'Northern Spy' en_US
dc.subject Biennial bearing en_US
dc.subject Precocity en_US
dc.subject Vegetative growth en_US
dc.subject Branching en_US
dc.subject Ethephon en_US
dc.subject Napthaleneacetic acid en_US
dc.subject Prohexadione-calcium en_US
dc.subject Benzyladenine en_US
dc.title Plant Bioregulator Strategies to Alleviate Biennial Bearing, Enhance Precocity, and Control Vegetative Growth of ‘Northern Spy’ Apple Trees en_US
dc.type Thesis en_US
dc.degree.programme Plant Agriculture en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Plant Agriculture en_US
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