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Dose Responses of Five Broadleaf Weeds to Saflufenacil

Published online by Cambridge University Press:  20 January 2017

Patrick W. Geier ,
Phillip W. Stahlman  and
Leo D. Charvat
Patrick W. Geier*
Affiliation:
Kansas State University Agricultural Research Center, Hays, KS 67601
Phillip W. Stahlman
Affiliation:
Kansas State University Agricultural Research Center, Hays, KS 67601
Leo D. Charvat
Affiliation:
BASF Corporation, Lincoln, NE 68523
*
Corresponding author's E-mail: [email protected].
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Abstract

Greenhouse dose–response studies were conducted to determine the effectiveness of PRE and POST applications of saflufenacil on blue mustard, flixweed, Palmer amaranth, redroot pigweed, and tumble pigweed. Weed species did not differ in their responses to saflufenacil applied PRE. Averaged across species, PRE application of saflufenacil at 6 to 30 g/ha reduced weed biomass 82 to 98%, but biomass did not differ among rates of 12 g/ha or higher. POST application of saflufenacil reduced weed biomass by 92%, averaged across species and rates. On the basis of regression analysis, the 90% plant biomass reduction for saflufenacil applied PRE and POST was 9 and 6 g/ha, respectively. Saflufenacil applied PRE reduced population density by 77 to 98%, averaged across weed species; a rate of 9 g/ha reduced population density 90% (DR90) on the basis of regression analysis. Averaged across species, POST application of 6 to 30 g/ha reduced population density by 63 to 93%, but regression analysis indicated that the DR90 value was greater than 30 g/ha. Averaged across rates, saflufenacil reduced the population density of flixweed, Palmer amaranth, redroot pigweed, tumble pigweed, and blue mustard by 49, 64, 67, 73, and 78%, respectively.

Keywords

Saflufenacil, N′-[2-chloro-4-fluoro-5-(3-methyl-2,6-dioxo-4-(trifluoromethyl)-3,6-dihydro-1(2H)pyrimidinyl)benzoyl]-N-isopropyl-N-methylsulfamideblue mustard, Chorispora tenella (Pallas) DC., COBTEflixweed, Descurainia sophia (L.) Webb. ex Prantl, DESSOPalmer amaranth, Amaranthus palmeri S. Wats., AMAPAredroot pigweed, Amaranthus retroflexus L., AMAREtumble pigweed, Amaranthus albus L., AMAALBAS 800Hbiomass reductioncornnonlinear regressionpopulation density reductionsoybean
Type
Notes
Information
Weed Technology , Volume 23 , Issue 2 , June 2009 , pp. 313 - 316
Copyright
Copyright © Weed Science Society of America 

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