Effect of fungicide treatments on incidence of powdery mildew of pecan and on pecan nut quality

Persistent Link:
http://hdl.handle.net/10150/226097
Title:
Effect of fungicide treatments on incidence of powdery mildew of pecan and on pecan nut quality
Author:
Olsen, M.; Rasmussen, S.; Nischwitz, C.
Issue Date:
Feb-2002
Publisher:
College of Agriculture, University of Arizona (Tucson, AZ)
Journal:
Citrus and Deciduous Fruit and Nut Research Report
Abstract:
Powdery mildew of pecan, caused by Microsphaera ulni, was observed on pecan shucks by the latter part of June 2000 in a commercial pecan orchard near Sahuarita, Arizona. Results of 1999 studies indicated that infection does not reduce nut quality. In order to determine effects of fungicide treatments and to substantiate results from 1999, preventive applications of micronized sulfur and azoxystrobin were initiated on June 8, 2000 in selected clusters in both Wichita and Western varieties. Trials were established in plots that had a high incidence of powdery mildew in 1999. Whole nut weights, kernel weights, or color ratings were not significantly different among clusters of nuts that were treated with fungicides and untreated nuts that were infected with powdery mildew. Percent disease incidence was 100% in untreated clusters, 0% in clusters treated with azoxystrobin every two weeks, and 5.3% (Wichita) and 8.8% (Western) in clusters treated with sulfur three times early in the season. Results indicate that disease did not affect nut weight or quality and that early preventive fungicide treatments are effective in controlling infections.
Keywords:
Agriculture -- Arizona; Citrus fruits -- Arizona; Pecan -- Arizona; Pecan -- Diseases
Series/Report no.:
AZ1275; Series P-129
Sponsors:
Arizona Citrus Research Council

Full metadata record

DC FieldValue Language
dc.titleEffect of fungicide treatments on incidence of powdery mildew of pecan and on pecan nut qualityen_US
dc.contributor.authorOlsen, M.en_US
dc.contributor.authorRasmussen, S.en_US
dc.contributor.authorNischwitz, C.en_US
dc.date.issued2002-02-
dc.publisherCollege of Agriculture, University of Arizona (Tucson, AZ)en_US
dc.identifier.journalCitrus and Deciduous Fruit and Nut Research Reporten_US
dc.description.abstractPowdery mildew of pecan, caused by Microsphaera ulni, was observed on pecan shucks by the latter part of June 2000 in a commercial pecan orchard near Sahuarita, Arizona. Results of 1999 studies indicated that infection does not reduce nut quality. In order to determine effects of fungicide treatments and to substantiate results from 1999, preventive applications of micronized sulfur and azoxystrobin were initiated on June 8, 2000 in selected clusters in both Wichita and Western varieties. Trials were established in plots that had a high incidence of powdery mildew in 1999. Whole nut weights, kernel weights, or color ratings were not significantly different among clusters of nuts that were treated with fungicides and untreated nuts that were infected with powdery mildew. Percent disease incidence was 100% in untreated clusters, 0% in clusters treated with azoxystrobin every two weeks, and 5.3% (Wichita) and 8.8% (Western) in clusters treated with sulfur three times early in the season. Results indicate that disease did not affect nut weight or quality and that early preventive fungicide treatments are effective in controlling infections.en_US
dc.subjectAgriculture -- Arizonaen_US
dc.subjectCitrus fruits -- Arizonaen_US
dc.subjectPecan -- Arizonaen_US
dc.subjectPecan -- Diseasesen_US
dc.identifier.urihttp://hdl.handle.net/10150/226097-
dc.relation.ispartofseriesAZ1275en_US
dc.relation.ispartofseriesSeries P-129en_US
dc.description.sponsorshipArizona Citrus Research Councilen_US
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