The Use of Norflurazon (Zorial 5G) in Parker Valley Alfalfa for Purple Nutsedge Suppression in 1997-98

Persistent Link:
http://hdl.handle.net/10150/208250
Title:
The Use of Norflurazon (Zorial 5G) in Parker Valley Alfalfa for Purple Nutsedge Suppression in 1997-98
Author:
Knowles, Tim C.; McCloskey, William B.; McGuire, Jerry
Affiliation:
La Paz County Cooperative Extension, University of Arizona, Parker, AZ; Department of Plant Sciences, University of Arizona, Tucson, AZ
Issue Date:
Oct-1998
Publisher:
College of Agriculture, University of Arizona (Tucson, AZ)
Journal:
Forage and Grain: A College of Agriculture Report
Abstract:
Two experiments were conducted during 1997 -98 to study the use of norflurazon (Zorial 5G) for purple nutsedge control in alfalfa. In experiment 1, Zorial 5G was applied in spring 1996 and 1997 at application rates of 1.0, 1.5, 2.0, and 3.0 lb a.i./A. Split applications were made each summer in four of eight treatments for total annual Zorial 5G rates of 2.0, 3.0, and 4.0 lb a.i./A-year. In the fall of 1997, each plot was divided into two subplots. One set of subplots was disced twice and replanted with alfalfa. Alfalfa planted into these subplots was not affected by the residual soil concentrations of norflurazon. In the other set of undisturbed subplots, the residual soil concentrations of norflurazon continued to provide substantial suppression of purple nutsedge in 1998. However, by August 1998, the 3 lb a.i. /A -year rate only provided fair nutsedge suppression (51 %), while the 4 lb a. i. /A -year rate still provided satisfactory suppression (75 %). At rates of 2 lb a.i. /A-year or less, the residual effects of norflurazon declined to low levels in 1998 and did not keep purple nutsedge population levels from rebounding to pretreatment levels. In experiment 2, the efficacy of single spring (April 30) applications of Zorial 5G (norflurazon) at rates of 1.0, 1.5, 2.0, 2.5, and 3.0 lb a.i./A; of Treflan TR10 (trifluralin) at a rate of 2 lb a.i. /A, and of Visor 5G (thiazopyr) at rates of 0.25 and 0.50 lb a.i. /A were evaluated. As of August 4, 1998, purple nutsedge was the predominate weed species in this experiment. Zorial 5G applications at rates ranging from 1.5 to 3.0 lb a.i. /A provided moderate (57-68 %) purple nutsedge suppression. Rates above 1.5 lb a.i./A did not significantly improve purple nutsedge control suggesting that in new alfalfa stands, 1.5 lb a.i/A may be an appropriate rate for the first part of a split application. To date, single applications of Visor 5G at 0.25 and 0.50 lb a.i./A and Treflan TR-10 at 2 lb a.i./A have provided poor (17-33 %) purple nutsedge suppression.
Keywords:
Agriculture -- Arizona; Grain -- Arizona; Forage plants -- Arizona; Alfalfa -- Arizona; Alfalfa -- Weed control
Series/Report no.:
AZ1059; Series P-114

Full metadata record

DC FieldValue Language
dc.titleThe Use of Norflurazon (Zorial 5G) in Parker Valley Alfalfa for Purple Nutsedge Suppression in 1997-98en_US
dc.contributor.authorKnowles, Tim C.en_US
dc.contributor.authorMcCloskey, William B.en_US
dc.contributor.authorMcGuire, Jerryen_US
dc.contributor.departmentLa Paz County Cooperative Extension, University of Arizona, Parker, AZen_US
dc.contributor.departmentDepartment of Plant Sciences, University of Arizona, Tucson, AZen_US
dc.date.issued1998-10-
dc.publisherCollege of Agriculture, University of Arizona (Tucson, AZ)en_US
dc.identifier.journalForage and Grain: A College of Agriculture Reporten_US
dc.description.abstractTwo experiments were conducted during 1997 -98 to study the use of norflurazon (Zorial 5G) for purple nutsedge control in alfalfa. In experiment 1, Zorial 5G was applied in spring 1996 and 1997 at application rates of 1.0, 1.5, 2.0, and 3.0 lb a.i./A. Split applications were made each summer in four of eight treatments for total annual Zorial 5G rates of 2.0, 3.0, and 4.0 lb a.i./A-year. In the fall of 1997, each plot was divided into two subplots. One set of subplots was disced twice and replanted with alfalfa. Alfalfa planted into these subplots was not affected by the residual soil concentrations of norflurazon. In the other set of undisturbed subplots, the residual soil concentrations of norflurazon continued to provide substantial suppression of purple nutsedge in 1998. However, by August 1998, the 3 lb a.i. /A -year rate only provided fair nutsedge suppression (51 %), while the 4 lb a. i. /A -year rate still provided satisfactory suppression (75 %). At rates of 2 lb a.i. /A-year or less, the residual effects of norflurazon declined to low levels in 1998 and did not keep purple nutsedge population levels from rebounding to pretreatment levels. In experiment 2, the efficacy of single spring (April 30) applications of Zorial 5G (norflurazon) at rates of 1.0, 1.5, 2.0, 2.5, and 3.0 lb a.i./A; of Treflan TR10 (trifluralin) at a rate of 2 lb a.i. /A, and of Visor 5G (thiazopyr) at rates of 0.25 and 0.50 lb a.i. /A were evaluated. As of August 4, 1998, purple nutsedge was the predominate weed species in this experiment. Zorial 5G applications at rates ranging from 1.5 to 3.0 lb a.i. /A provided moderate (57-68 %) purple nutsedge suppression. Rates above 1.5 lb a.i./A did not significantly improve purple nutsedge control suggesting that in new alfalfa stands, 1.5 lb a.i/A may be an appropriate rate for the first part of a split application. To date, single applications of Visor 5G at 0.25 and 0.50 lb a.i./A and Treflan TR-10 at 2 lb a.i./A have provided poor (17-33 %) purple nutsedge suppression.en_US
dc.subjectAgriculture -- Arizonaen_US
dc.subjectGrain -- Arizonaen_US
dc.subjectForage plants -- Arizonaen_US
dc.subjectAlfalfa -- Arizonaen_US
dc.subjectAlfalfa -- Weed controlen_US
dc.identifier.urihttp://hdl.handle.net/10150/208250-
dc.relation.ispartofseriesAZ1059en_US
dc.relation.ispartofseriesSeries P-114en_US
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