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Glyphosate Injury, Rainfastness, Absorption, and Translocation in Purple Nutsedge (Cyperus rotundus)

Published online by Cambridge University Press:  12 June 2017

Juanito V. Bariuan ,
Krishna N. Reddy  and
Gene D. Wills
Juanito V. Bariuan
Affiliation:
Southern Weed Science Research Unit, USDA-ARS, P.O. Box 350, Stoneville, MS 38776
Krishna N. Reddy*
Affiliation:
Southern Weed Science Research Unit, USDA-ARS, P.O. Box 350, Stoneville, MS 38776
Gene D. Wills
Affiliation:
Mississippi Agricultural and Forestry Experiment Station, Delta Research and Extension Center, P.O. Box 197, Stoneville, MS 38776
*
Corresponding author's E-mail: kreddy@ag.gov.
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Abstract

Greenhouse and laboratory experiments were conducted to study activity, rainfastness, absorption, and translocation of glyphosate with and without a nonionic organosilicone surfactant in purple nutsedge. Purple nutsedge responded differently to glyphosate depending on growth stage. Glyphosate at 2.24 kg ai/ha in 17-d-old and at 4.48 kg/ha in 10-wk-old plants controlled purple nutsedge at least 96%. Regrowth of plants and tuber resprouting were greatly reduced in these treatments. Organosilicone surfactant did not increase efficacy of glyphosate. A simulated rainfall of 2.5 cm (7.5 cm/h intensity) at 1 and 24 h after glyphosate application reduced efficacy by one-half and one-third, respectively, compared with no simulated rainfall. A rain-free period of 72 h prevented loss of glyphosate activity. Absorption of 14C-glyphosate increased from 2.8% at 1 h after application to 21.4% at 168 h after application and translocation increased from 0.43% at 1 h after application to 5.18% at 168 h after application. Organosilicone surfactant did not affect absorption and translocation of glyphosate in purple nutsedge.

Keywords

Glyphosate, N-(phosphonomethyl)glycinepurple nutsedge, Cyperus rotundus L. # CYPROOrganosilicone surfactantuptaketuber viabilityCYPROHAA, hours after applicationWAA, weeks after application
Type
Research
Information
Weed Technology , Volume 13 , Issue 1 , March 1999 , pp. 112 - 119
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

Current address of senior: National Crop Protection Center, University of the Philippines, Los Banos, College, Laguna 4031, Philippines.

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