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Relationship of Leaf Position to Herbicide Absorption and Organosilicone Adjuvant Efficacy

Published online by Cambridge University Press:  12 June 2017

Frank C. Roggenbuck ,
Richard F. Burow  and
Donald Penner
Frank C. Roggenbuck
Affiliation:
Dep. Crop Soil Sci., Michigan State Univ., East Lansing, MI 48824
Richard F. Burow
Affiliation:
Dep. Crop Soil Sci., Michigan State Univ., East Lansing, MI 48824
Donald Penner
Affiliation:
Dep. Crop Soil Sci., Michigan State Univ., East Lansing, MI 48824
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Abstract

The absorption of 14C-bentazon and 14C-acifluorfen by individual leaves of velvetleaf was measured from the cotyledons to the most recently developed leaf in plants that had developed seven leaves beyond the cotyledons. Herbicide absorption 1 min after application was greatly enhanced by the organosilicone adjuvant Sylgard 309 explaining previously observed enhanced efficacy and rainfastness by this adjuvant. 14C-herbicide absorption was greatest by the cotyledons and decreased upward to the most recently developed leaf. Absorption of the 14C-Sylgard 309 was similar to that of the 14C-labelled herbicides and was not related to the number of stomata or leaf area covered by the spray droplets. These results are consistent with the hypothesis that the mode of action of Sylgard 309 is to enhance cuticular absorption and not stomatal infiltration.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acidbentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidevelvetleaf, Abutilon theophrasti Medicus #4 ABUTHAcifluorfenbentazoncrop oil concentrategrowth stageSylgard 309ABUTH
Type
Research
Information
Weed Technology , Volume 8 , Issue 3 , September 1994 , pp. 582 - 585
Copyright
Copyright © 1994 by the Weed Science Society of America 

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