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Effect of Bicyclopyrone on Triploid Watermelon in Plasticulture

Published online by Cambridge University Press:  21 June 2018

Matthew B. Bertucci
Affiliation:
Graduate Student, North Carolina State University, Department of Horticultural Science, Raleigh, NC, USA
Katherine M. Jennings
Affiliation:
Associate Professor, North Carolina State University, Department of Horticultural Science, Raleigh, NC, USA
David W. Monks
Affiliation:
Associate Director, North Carolina Agricultural Research Service, Raleigh, NC, USA
David L. Jordan
Affiliation:
Professor, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
Jonathan R. Schultheis
Affiliation:
Professor, North Carolina State University, Department of Horticultural Science, Raleigh, NC, USA
Frank J. Louws
Affiliation:
Professor and Director, Department of Entomology and Plant Pathology and National Science Foundation-Center for Integrated Pest Management, Raleigh, NC, USA
Matthew D. Waldschmidt
Affiliation:
Research Technician, North Carolina State University, Department of Horticultural Science, Raleigh, NC, USA
Corresponding
E-mail address:

Abstract

Field studies were conducted to determine watermelon tolerance and yield response when treated with bicyclopyrone preplant (PREPLANT), POST, and POST-directed (POST-DIR). Treatments consisted of two rates of bicyclopyrone (37.5 and 50 g ai ha–1), fomesafen (175 g ai ha–1), S-metolachlor (802 g ai ha–1), and a nontreated check. Preplant treatments were applied to formed beds 1 d prior to transplanting and included bicyclopyrone (37.5 and 50 g ha–1) and fomesafen (175 g ha–1), and new polyethylene mulch was subsequently laid above treated beds. POST and POST-DIR treatments were applied 14 ± 1 d after watermelon transplanting and included bicyclopyrone (37.5 and 50 g ha–1) POST and POST-DIR, and S-metolachlor (802 g ai ha–1) POST-DIR. POST-DIR treatments were applied to row middles, ensuring that no herbicide contacted watermelon vines or polyethylene mulch. At 2 wk after transplanting (WAT), 15% foliar bleaching was observed in watermelon treated with bicyclopyrone (50 g ha–1) PRE. At 3 WAT, bicyclopyrone (37.5 and 50 g ha–1) POST caused 16% and 17% foliar bleaching and 8% and 9% crop stunting, respectively. At 4 WAT, initial injury had subsided and bicyclopyrone (37.5 and 50 g ha–1) POST caused 4% and 4% foliar bleaching and 4% and 8% crop stunting, respectively. No symptoms of bleaching or stunting were observed at 6- and 8-WAT ratings. Watermelon total yield, marketable yield, total fruit number, marketable fruit number, and average fruit size were unaffected by herbicide treatments. Therefore, registration of bicyclopyrone (37.5 and 50 g ha–1) PREPLANT, POST, and POST-DIR would offer watermelon producers a safe herbicide option and a novel mode of action for weed management.

Type
Research Article
Copyright
© Weed Science Society of America, 2018 

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