Crop competitive ability contributes to herbicide performance in sweet corn

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Date: Feb. 2008
From: Weed Research(Vol. 48, Issue 1)
Publisher: Wiley Subscription Services, Inc.
Document Type: Author abstract; Report
Length: 281 words

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Abstract :

Byline: M M WILLIAMS (*), R A BOYDSTON ([dagger]), A S DAVIS (*) Keywords: competition; cultivar; dose-response; herbicide; integrated weed management; risk; sethoxydim; Zea mays Abstract: Summary Crop variety effects on herbicide performance is not well characterised, particularly for sweet corn, a crop that varies greatly among hybrids in competitive ability with weeds. Field studies were used to determine the effects of crop competitive ability on season-long herbicide performance in sweet corn. Two sethoxydim-tolerant sweet corn hybrids were grown in the presence of Panicum miliaceum and plots were treated post-emergence with a range of sethoxydim doses. Significant differences in height, leaf area index and intercepted light were observed between hybrids near anthesis. Across a range of sub-lethal herbicide doses, the denser canopy hybrid Rocker suppressed P. miliaceum shoot biomass and fecundity to a greater extent than the hybrid Cahill. Yield of sweet corn improved to the level of the weed-free control with increasing sethoxydim dose. The indirect effect of herbicide dose on crop yield, mediated through P. miliaceum biomass reduction, was significant for all of the Cahill's yield traits but not Rocker. These results indicate that a less competitive hybrid requires relatively more weed suppression by the herbicide to not only reduce weed growth and seed production, but also to maintain yield. Sweet corn competitive ability consistently influences season-long herbicide performance. Author Affiliation: (*)USDA-ARS, Invasive Weed Management Research, Urbana, Illinois, USA, and ([dagger])USDA-ARS, Vegetable and Forage Crops Research, Prosser, Washington, USA Article History: Received 29 March 2007 Revised version accepted 21 September 2007 Article note: MM Williams II, USDA-ARS, Invasive Weed Management Research, University of Illinois, 1102 S. Goodwin Ave., Urbana, Illinois 61801, USA. Tel: (+1) 217 244 5476; E-mail: mmwillms@uiuc.edu

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Gale Document Number: GALE|A173274919