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Evaluation of Herbicides for Pumpkin (Cucurbita spp.)

Published online by Cambridge University Press:  20 January 2017

Desmond Brown  and
John Masiunas
Desmond Brown
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801
John Masiunas*
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801
*
Corresponding author's E-mail: masiunas@uiuc.edu
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Abstract

Field and greenhouse studies were conducted to evaluate herbicides in pumpkin. Field experiments at three Illinois locations determined weed control and crop injury from clomazone, dimethenamid, ethalfluralin, sulfentrazone, imazamox, RPA 201772, flumiclorac, and halosulfuron applied preemergence. Clomazone plus sulfentrazone controlled redroot pigweed 78 to 99%, ivyleaf morningglory 80 to 97%, common lambsquarters 97%, common purslane 84 to 99%, and velvetleaf 55 to 99%. Imazamox plus clomazone commonly provided more consistent broadleaf weed control than did ethalfluralin plus clomazone. RPA 201772 when used on sandy soils killed the pumpkin. Sulfentrazone initially caused chlorosis and necrosis on pumpkin seedlings when soil organic matter was low (< 1%) or when soil moisture was high. However, plants recovered rapidly, and yields were not affected. In a greenhouse study pumpkin was more tolerant to clomazone plus sulfentrazone than to sulfentrazone.

Keywords

Clomazonedimethenamidethalfluralinflumiclorachalosulfuron, imazamoxRPA 201772 (proposed name, isoxaflutole), 5-cyclopropyl-4-(2-methylsulphonyl)-4-trifluoromethyl-benzoyl isoxazolesulfentrazonecommon lambsquarters, Chenopodium album L. #3 CHEALcommon purslane, Portulaca oleracea L. # POROLivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHEredroot pigweed, Amaranthus retroflexus L. # AMAREvelvetleaf, Abutilon theophrasti Medicus # ABUTHpumpkin, Cucurbita pepo var. pepo L. ‘Howden’Herbicide combinationsherbicide interactionsDAT, days after treatmentPRE, preemergence
Type
Research
Information
Weed Technology , Volume 16 , Issue 2 , June 2002 , pp. 282 - 292
Copyright
Copyright © Weed Science Society of America 

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