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Triploid watermelon response to flumioxazin

Published online by Cambridge University Press:  29 April 2021

Stephen L. Meyers Open the ORCID record for Stephen L. Meyers [Opens in a new window] ,
Wenjing Guan ,
Dan Egel  and
Dennis Nowaskie
Stephen L. Meyers
Affiliation:
Assistant Professor, Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN
Wenjing Guan*
Affiliation:
Assistant Clinical Professor, Department of Horticulture and Landscape Architecture, Purdue University, Vincennes, IN
Dan Egel
Affiliation:
Clinical Engagement Professor, Department of Botany and Plant Pathology, Purdue University, Vincennes, IN
Dennis Nowaskie
Affiliation:
Superintendent, Southwest Purdue Agricultural Center, Vincennes, IN
*
Author for correspondence: Wenjing Guan, Department of Horticulture and Landscape Architecture, Purdue University, Vincennes, IN47591. Email: guan40@purdue.edu
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Abstract

Field trials were conducted in 2016 and 2017 at the Southwest Purdue Agricultural Center in Vincennes, IN, to determine the tolerance of plasticulture-grown ‘Fascination’ triploid watermelon to flumioxazin. Treatments were applied after plastic was laid, but 1 d prior to transplanting, and consisted of row middle applications of clomazone (210 g ai ha−1) plus ethafluralin (672 g ai ha−1), flumioxazin (107 g ai ha−1), and flumioxazin (88 g ha−1) plus pyroxasulfone (112 g ai ha−1); a broadcast application of flumioxazin (107 g ha−1); and a nontreated check. The broadcast application of flumioxazin reduced watermelon vine length and normalized difference vegetation index (NDVI) values compared with values for the nontreated check. All other herbicide treatments had vine length and NDVI values similar to those of the nontreated check. At 25/26 d after transplanting (DAP), weedy ground cover in row middles of the nontreated check was 39% and 14% in 2016 and 2017, respectively. Weedy ground cover in herbicide-containing treatments was significantly less, at ≤7% and ≤5% in 2016 and 2017, respectively. Marketable watermelon yield of the nontreated check was 77,931 kg and 11,115 fruits ha−1. The broadcast application of flumioxazin resulted in reduced marketable yield (64,894 kg ha−1) and fewer fruit (9,550 ha−1).

Keywords

Clomazoneethalfluralinflumioxazinpyroxasulfonewatermelon ‘Fascination’Citrullus lanatus (Thunb.) Matsum. & NakaiCrop injurycrop tolerancePPONDVIrow middles
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 4 , August 2021 , pp. 618 - 622
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Robert Nurse, Agriculture and Agri-Food Canada

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