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Pelargonic Acid and Rainfall Effects on Glyphosate Activity in Trumpetcreeper (Campsis radicans)

Published online by Cambridge University Press:  20 January 2017

Demosthenis Chachalis  and
Krishna N. Reddy
Demosthenis Chachalis
Affiliation:
Southern Weed Science Research Unit, United States Department of Agriculture, Agricultural Research Service, P.O. Box 350, Stoneville, MS 38776
Krishna N. Reddy*
Affiliation:
Southern Weed Science Research Unit, United States Department of Agriculture, Agricultural Research Service, P.O. Box 350, Stoneville, MS 38776
*
Corresponding author's E-mail: kreddy@ars.usda.gov
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Abstract

The effects of pelargonic acid and rainfall on glyphosate activity, absorption, and translocation in trumpetcreeper were investigated. Four- to six-leaf–stage plants raised from rootstocks were treated with glyphosate at 0, 0.42, 0.84, 1.68, and 3.36 kg ae/ha. Glyphosate at 1.68 kg/ha and higher controlled trumpetcreeper >98% and completely inhibited regrowth from rootstocks of treated plants. A simulated rainfall of 2.5 cm water applied at 6 h after glyphosate application (HAA) reduced efficacy by one-fifth compared with no rainfall. Absorption of 14C-glyphosate in trumpetcreeper increased from 2.3 to 20.2%, whereas translocation increased from 0.4 to 10.5% from 6 to 192 HAA. At 192 HAA, 9.7% of the recovered 14C-label remained in the treated leaf, 0.6% moved above the treated leaf, and 9.0% moved to fibrous roots and rootstock. The addition of pelargonic acid to glyphosate did not improve glyphosate absorption or translocation or synergize activity in trumpetcreeper compared with glyphosate alone. These results suggest that a 24-h rain-free period and 4 d without disturbance from tillage could maximize glyphosate absorption and translocation in trumpetcreeper.

Keywords

Glyphosatepelargonic acidtrumpetcreeper, Campsis radicans (L.) Seem. ex Bureau #3 CMIRAAbsorptioninteractionrainfastnessregrowthtranslocationuptakeHAA, hours after applicationWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 18 , Issue 1 , March 2004 , pp. 66 - 72
Copyright
Copyright © Weed Science Society of America 

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