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Effects of Alternaria destruens, Glyphosate, and Ammonium Sulfate Individually and Integrated for Control of Dodder (Cuscuta pentagona)

Published online by Cambridge University Press:  20 January 2017

Jennifer C. Cook ,
Raghavan Charudattan ,
Thomas W. Zimmerman ,
Erin N. Rosskopf ,
William M. Stall  and
Gregory E. MacDonald
Jennifer C. Cook
Affiliation:
Plant Pathology Department, University of Florida, P.O. Box 110680, Gainesville, FL 32611
Raghavan Charudattan
Affiliation:
Plant Pathology Department, University of Florida, P.O. Box 110680, Gainesville, FL 32611
Thomas W. Zimmerman
Affiliation:
University of the Virgin Islands-Agricultural Experiment Station, R.R. 1 Box 10,000, Kingshill, VI 00850
Erin N. Rosskopf
Affiliation:
USDA-ARS-USHRL, Ft. Pierce, FL 34945
William M. Stall
Affiliation:
Horticultural Sciences Department, P.O. Box 110690, Gainesville, FL 32611
Gregory E. MacDonald*
Affiliation:
Department of Agronomy, University of Florida, P.O. Box 110500, Gainesville, FL 32611
*
Corresponding author's E-mail: biocontrol@hotmail.com.
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Abstract

Dodder is a serious parasitic weed in the crops in which it is a problem (particularly citrus). Alternaria destruens is the active ingredient in a registered bioherbicide for control of dodder species. In greenhouse studies, the treatments applied to citrus parasitized with field dodder were a nontreated control; oil at 7.5% v/v in water; ammonium sulfate at 0.125% w/v in water; glyphosate at 0.02 kg ae/L; A. destruens at 1.8 × 1010 spores/L; A. destruens (1.8 × 1010 spores/L) + oil at 7.5% v/v in water; and a mixture of A. destruens (1.8 × 1010 spores/L) + oil at 7.5% v/v in water + glyphosate at 0.02 kg ae/L + ammonium sulfate 0.125% w/v (the mixture treatment). The highest disease or damage severity rating out of all treatments, measured as the area under the disease or damage progress curve (AUDPC), was obtained for the mixture treatment. By 35 d after treatment, all field dodder plants that received the mixture treatment were dead but the host plant, citrus, was not. These results indicate the feasibility of integrating glyphosate, ammonium sulfate, and A. destruens to manage dodder.

Keywords

Glyphosateammonium sulfatefield dodder, Cuscuta pentagona Engelm. CVCPEcitrus, Citrus spp. ‘Smooth Flat Seville’Alternaria destruens L. Simmons, sp. novAlternative weed managementbioherbicidebiological controldodderherbicide
Type
Research Article
Information
Weed Technology , Volume 23 , Issue 4 , December 2009 , pp. 550 - 555
Copyright
Copyright © Weed Science Society of America 

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