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Site of uptake, absorption, translocation, and metabolism of ethofumesate in three turfgrass species

Published online by Cambridge University Press:  20 January 2017

Eric A. Kohler  and
Bruce E. Branham
Eric A. Kohler
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, IN 47907-1150
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Abstract

Site of uptake, absorption, translocation, and metabolism of ethofumesate were studied to determine the differential responses of annual bluegrass, creeping bentgrass, and perennial ryegrass. Using barriers to isolate foliage or soil, the primary site of ethofumesate absorption was found to be the foliage. Symptoms resulting from foliar and over-the-top spray applications of ethofumesate to annual bluegrass included stunting of growth, epinasty, swelling of the crown, darker green color, and fusing of expanding leaf blades. Averaged over the course of the experiment, annual bluegrass, creeping bentgrass, and perennial ryegrass absorbed 33, 11, and 13% of ethofumesate applied. No ethofumesate was detected distally from the treated leaf, but overall translocation of 14C 14 d after treatment (DAT) was 2.2, 5.8, and 2.2% of the absorbed 14C for annual bluegrass, creeping bentgrass, and perennial ryegrass, respectively. Ethofumesate was rapidly metabolized in each species with half-lives ranging from 4.5 to 7 d. The three grasses had metabolized, on average, 67% of the absorbed ethofumesate 14 DAT.

Keywords

Ethofumesateannual bluegrass, Poa annua L. POANNcreeping bentgrass, Agrostis stolonifera L. AGSST ‘Penncross’perennial ryegrass, Lolium perenne L. LOLPE ‘Manhattan II’Selectivityvolatility
Type
Research Article
Information
Weed Science , Volume 50 , Issue 5 , October 2002 , pp. 576 - 580
Copyright
Copyright © Weed Science Society of America 

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