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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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Burnett, Alison. The effect of QoI fungicides on monocyclic components of peach brown rot epidemics caused by monilinia fructicola. Retrieved from https://doi.org/doi:10.7282/T3K35TWW

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TitleThe effect of QoI fungicides on monocyclic components of peach brown rot epidemics caused by monilinia fructicola
NameBurnett, Alison (author); Lalancette, Norman (chair); Oudemans, Peter (internal member); Gould, Ann (internal member); White, James (internal member); Rutgers University; Graduate School - New Brunswick
Date Created
Other Date2009-05 (degree)
SubjectPlant Biology, Peach--Diseases and pests--Control, Brown rot fungi of fruit--Biological control, Monilinia fructicola
Extentviii, 59 p. : ill.
DescriptionBrown 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.
NoteM.S.
NoteIncludes bibliographical references (p. 45-48)
Noteby Alison Burnett
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T3K35TWW
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameNjNbRU
RightsThe author owns the copyright to this work.
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