Seasonal variation in the response of 'Valencia' orange to two abscission compounds
Identifieur interne : 002F85 ( Main/Exploration ); précédent : 002F84; suivant : 002F86Seasonal variation in the response of 'Valencia' orange to two abscission compounds
Auteurs : U. Hartmond [États-Unis] ; J. D. Whitney [États-Unis] ; J. K. Burns [États-Unis] ; W. J. Kender [États-Unis]Source :
- HortScience [ 0018-5345 ] ; 2000.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Fruit.
English descriptors
- KwdEn :
Abstract
Two field studies were conducted to evaluate the effect of metsulfuron-methyl and 5-chloro-3-methyl-4-nitro-lH-pyrazole (CMN-pyrazole) on abscission of Valencia' orange [Citrus sinensis (L.) Osbeck] during the 3-month harvest season. Solutions of metsulfuron-methyl at 0.5, 1, and 2 mg.L-1 active ingredient (a.i.) were applied at 10-day intervals beginning on 13 Feb. and ending 18 May 1998. Early in the harvest season, 1 or 2 mg.L-1 metsulfuron-methyl significantly reduced fruit detachment force (FDF) 14 days after application. Metsulfuron-methyl was less effective during a 4- to 6-week period following bloom ("less-responsive period"). After this period, metsulfuron-methyl regained the ability to loosen fruit. Applications of 2 mg.L-1 a.i. were more effective than 1 mg.L-1 in reducing FDF and causing leaf drop, but 0.5 mg.L-1 a.i. had little or no effect on FDF. Flowers and leaflets on developing shoots and young fruit completely abscised with 1 and 2 mg.L-1 a.i. Defoliation and twig dieback was extensive at all concentrations and spray dates, eliminating metsulfuron-methyl as a commercially viable abscission agent for citrus. In a separate experiment CMN-pyrazole at 50 and 100 mg.L-1 a.i. and metsulfuron-methyl at 0.5 mg.L-1 a.i. were applied to 'Valencia' trees to determine fruit removal with a trunk shake and catch harvesting system. Application of both abscission materials before and after the "less-responsive period" resulted in a 10% to 12% increase in fruit removal when compared to control trees. Less than a 35% reduction in FDF was sufficient to significantly increase fruit removal. Only 100 mg.L-1 a.i. CMN-pyrazole significantly increased fruit removal when applied during the "less-responsive period." Chemical names used: Methyl-2-(((((4-Methoxy-6-Methyl-1,3,5-Triazin-2-yl)-Amino)Carbonyl) Amino)Sulfonyl)Benzene (Metsulfuron-methyl); 5-Chloro-3-methyl-4-nitro-1-H-pyrazole (CMN-pyrazolel.
Affiliations:
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Whitney</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>University of Florida, Institute for Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road</s1><s2>Lake Alfred, FL 33850-2299</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author><author><name sortKey="Burns, J K" sort="Burns, J K" uniqKey="Burns J" first="J. K." last="Burns">J. K. Burns</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>University of Florida, Institute for Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road</s1><s2>Lake Alfred, FL 33850-2299</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author><author><name sortKey="Kender, W J" sort="Kender, W J" uniqKey="Kender W" first="W. J." last="Kender">W. J. Kender</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>University of Florida, Institute for Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road</s1><s2>Lake Alfred, FL 33850-2299</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">00-0251885</idno><date when="2000">2000</date><idno type="stanalyst">PASCAL 00-0251885 INIST</idno><idno type="RBID">Pascal:00-0251885</idno><idno type="wicri:Area/PascalFrancis/Corpus">000978</idno><idno type="wicri:Area/PascalFrancis/Curation">000026</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000930</idno><idno type="wicri:doubleKey">0018-5345:2000:Hartmond U:seasonal:variation:in</idno><idno type="wicri:Area/Main/Merge">003191</idno><idno type="wicri:Area/Main/Curation">002F85</idno><idno type="wicri:Area/Main/Exploration">002F85</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Seasonal variation in the response of 'Valencia' orange to two abscission compounds</title><author><name sortKey="Hartmond, U" sort="Hartmond, U" uniqKey="Hartmond U" first="U." last="Hartmond">U. Hartmond</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>University of Florida, Institute for Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road</s1><s2>Lake Alfred, FL 33850-2299</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author><author><name sortKey="Whitney, J D" sort="Whitney, J D" uniqKey="Whitney J" first="J. D." last="Whitney">J. D. Whitney</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>University of Florida, Institute for Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road</s1><s2>Lake Alfred, FL 33850-2299</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author><author><name sortKey="Burns, J K" sort="Burns, J K" uniqKey="Burns J" first="J. K." last="Burns">J. K. Burns</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>University of Florida, Institute for Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road</s1><s2>Lake Alfred, FL 33850-2299</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author><author><name sortKey="Kender, W J" sort="Kender, W J" uniqKey="Kender W" first="W. J." last="Kender">W. J. Kender</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>University of Florida, Institute for Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road</s1><s2>Lake Alfred, FL 33850-2299</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author></analytic><series><title level="j" type="main">HortScience</title><title level="j" type="abbreviated">HortScience</title><idno type="ISSN">0018-5345</idno><imprint><date when="2000">2000</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">HortScience</title><title level="j" type="abbreviated">HortScience</title><idno type="ISSN">0018-5345</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abscission</term><term>Citrus sinensis</term><term>Fruit</term><term>Mechanical harvesting</term><term>Phytotoxicity</term><term>Seasonal variation</term><term>Treatment efficiency</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Variation saisonnière</term><term>Abscission</term><term>Récolte mécanique</term><term>Efficacité traitement</term><term>Phytotoxicité</term><term>Fruit</term><term>Citrus sinensis</term><term>CMN-pyrazole</term><term>Metsulfuron</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Fruit</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Two field studies were conducted to evaluate the effect of metsulfuron-methyl and 5-chloro-3-methyl-4-nitro-lH-pyrazole (CMN-pyrazole) on abscission of Valencia' orange [Citrus sinensis (L.) Osbeck] during the 3-month harvest season. Solutions of metsulfuron-methyl at 0.5, 1, and 2 mg.L<sup>-1</sup> active ingredient (a.i.) were applied at 10-day intervals beginning on 13 Feb. and ending 18 May 1998. Early in the harvest season, 1 or 2 mg.L<sup>-1</sup> metsulfuron-methyl significantly reduced fruit detachment force (FDF) 14 days after application. Metsulfuron-methyl was less effective during a 4- to 6-week period following bloom ("less-responsive period"). After this period, metsulfuron-methyl regained the ability to loosen fruit. Applications of 2 mg.L<sup>-1</sup> a.i. were more effective than 1 mg.L<sup>-1</sup> in reducing FDF and causing leaf drop, but 0.5 mg.L<sup>-1</sup> a.i. had little or no effect on FDF. Flowers and leaflets on developing shoots and young fruit completely abscised with 1 and 2 mg.L<sup>-1</sup> a.i. Defoliation and twig dieback was extensive at all concentrations and spray dates, eliminating metsulfuron-methyl as a commercially viable abscission agent for citrus. In a separate experiment CMN-pyrazole at 50 and 100 mg.L<sup>-1</sup> a.i. and metsulfuron-methyl at 0.5 mg.L<sup>-1</sup> a.i. were applied to 'Valencia' trees to determine fruit removal with a trunk shake and catch harvesting system. Application of both abscission materials before and after the "less-responsive period" resulted in a 10% to 12% increase in fruit removal when compared to control trees. Less than a 35% reduction in FDF was sufficient to significantly increase fruit removal. Only 100 mg.L<sup>-1</sup> a.i. CMN-pyrazole significantly increased fruit removal when applied during the "less-responsive period." Chemical names used: Methyl-2-(((((4-Methoxy-6-Methyl-1,3,5-Triazin-2-yl)-Amino)Carbonyl) Amino)Sulfonyl)Benzene (Metsulfuron-methyl); 5-Chloro-3-methyl-4-nitro-1-H-pyrazole (CMN-pyrazolel.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Floride</li></region></list><tree><country name="États-Unis"><region name="Floride"><name sortKey="Hartmond, U" sort="Hartmond, U" uniqKey="Hartmond U" first="U." last="Hartmond">U. Hartmond</name></region><name sortKey="Burns, J K" sort="Burns, J K" uniqKey="Burns J" first="J. K." last="Burns">J. K. Burns</name><name sortKey="Kender, W J" sort="Kender, W J" uniqKey="Kender W" first="W. J." last="Kender">W. J. Kender</name><name sortKey="Whitney, J D" sort="Whitney, J D" uniqKey="Whitney J" first="J. D." last="Whitney">J. D. Whitney</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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