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Response of Five Summer-Squash (Cucurbita pepo) Cultivars to Halosulfuron

Published online by Cambridge University Press:  20 January 2017

Keith D. Starke ,
David W. Monks ,
Wayne E. Mitchem  and
Andrew W. Macrae
Keith D. Starke
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
David W. Monks*
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
Wayne E. Mitchem
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
Andrew W. Macrae
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
*
Corresponding author's E-mail: david_monks@ncsu.edu
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Abstract

Response of ‘Dixie’, ‘Lemondrop’, ‘Multipik’, ‘Superpik’, and ‘Seneca Prolific’ summer squash to halosulfuron PRE or POST at 0.036, 0.053, and 0.072 kg ai/ha, or halosulfuron PRE fb halosulfuron POST at 0.018 fb 0.018, 0.027 fb 0.027, and 0.036 fb 0.036 kg/ha was field evaluated in 1997 and 1998. All halosulfuron treatments and rates reduced the height of cultivars 17–19% at 6 WAP (weeks after planting) and summer-squash injury (chlorosis and necrosis of crop foliage) was 6, 14, and 11% from halosulfuron PRE, POST, and PRE fb POST, respectively. Early summer-squash flowering was reduced 32–82% by halosulfuron, resulting in reduced early yields. Dixie was the cultivar most tolerant to halosulfuron. Early flowering of Dixie was reduced 32–36% compared to 32–82% for the other cultivars. Marketable yield of summer squash was reduced 20–30% by all rates of halosulfuron when averaged over all application timings. Marketable yield of Seneca Prolific, Superpik, Dixie, Multipik, and Lemondrop was reduced 0–17% by halosulfuron PRE. Halosulfuron POST or PRE fb POST reduced marketable yield of all summer-squash cultivars by 25–46%. Thus, summer squash was not tolerant of POST halosulfuron; however, Dixie, Multipik, Seneca Prolific, and Superpik exhibited tolerance to halosulfuron PRE.

Keywords

Halosulfuronsummer squash, Cucurbita pepo L. ‘Dixie’, ‘Multipik’, ‘Superpik’, ‘Seneca Prolific’ and ‘Lemondrop’Sulfonylureavegetable tolerance to herbicidesWAPweeks after planting
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006 , pp. 617 - 621
Copyright
Copyright © Weed Science Society of America 

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