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The effect of QoI fungicides on monocyclic components of peach brown rot epidemics caused by monilinia fructicola
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Text
TitleInfo
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Title
The effect of QoI fungicides on monocyclic components of peach brown rot epidemics caused by monilinia fructicola
SubTitle
PartName
PartNumber
NonSort
Identifier
ETD_1651
Identifier
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051178
Language
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eng
Genre
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theses
Subject
(ID = SBJ-1);
(authority = RUETD)
Topic
Plant Biology
Subject
(ID = SBJ-2);
(authority = ETD-LCSH)
Topic
Peach--Diseases and pests--Control
Subject
(ID = SBJ-3);
(authority = ETD-LCSH)
Topic
Brown rot fungi of fruit--Biological control
Subject
(ID = SBJ-4);
(authority = ETD-LCSH)
Topic
Monilinia fructicola
Abstract
Brown rot is the most significant disease infecting peach orchards in the United States and is caused by the ascomycete Monilinia fructicola. Blossom blight, twig cankers and fruit rot are disease symptoms that develop over the course of a season. Demethylation inhibitor fungicides, or DMIs, have been used for over twenty years to effectively control brown rot. Quinone outside inhibitors (QoIs), also known as strobilurin fungicides, are a relatively new class of fungicides previously shown to control brown rot when applied as protectants. We examined the effects of azoxystrobin, trifloxystrobin and a mixture of pyraclostrobin + boscalid on blossom blight and fruit infections. Peach trees were sprayed at different rates, volumes and timing intervals to investigate the possible curative properties of these strobilurins. Results showed that the most effective fungicide to control colonization of a peach fruit was azoxystrobin. Sporulation of fruit infections, as well as blossom blight cankers, was best controlled by applications of trifloxystrobin. This fungicide reduced sporulation by 89% on fruit and 71% on cankers when applied at the highest labeled rate. These data indicated that in addition to their known protectant activity, QoI fungicides exhibit specific curative properties that provide control during other phases of the brown rot infection cycle. In recent years in the southeastern United States peach growing region, studies have found DMI-resistant isolates of M. fructicola. Eleven isolates of M. fructicola taken from Southern New Jersey were screened for resistance using a PCR-RFLP method. One out of the eleven isolates examined showed similar genetic components to those isolates resistant to DMI fungicides, indicating that resistant strains exist in New Jersey orchards. Given this finding, the incorporation of strobilurins into the commercial spray program will be an important and necessary strategy to avoiding widespread DMI resistance in New Jersey. Since our results demonstrated good to excellent curative properties, particularly as anti-sporulants, we hypothesize that early- to mid-season deployment of the strobilurins will provide the greatest benefit in reducing development of brown rot epidemics during the harvest season.
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electronic resource
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viii, 59 p. : ill.
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M.S.
Note
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Includes bibliographical references (p. 45-48)
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by Alison Burnett
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Burnett
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Alison
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1983
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Alison Burnett
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Lalancette
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Norman
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chair
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Advisory Committee
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Norman Lalancette
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Oudemans
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Peter
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internal member
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Advisory Committee
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Peter Oudemans
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Gould
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Ann
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Advisory Committee
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Ann Gould
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White
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James
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internal member
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Advisory Committee
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James White
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Rutgers University
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Graduate School - New Brunswick
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school
OriginInfo
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2009
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2009-05
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xx
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NjNbRU
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Rutgers University Electronic Theses and Dissertations
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ETD
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Title
Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
Identifier
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doi:10.7282/T3K35TWW
Genre
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ETD graduate
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The author owns the copyright to this work.
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Open
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Non-exclusive ETD license
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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