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Formulation and Adjuvant Effects on Uptake and Translocation of Clethodim in Bermudagrass (Cynodon dactylon)

Published online by Cambridge University Press:  20 January 2017

Vijay K. Nandula ,
Daniel H. Poston ,
Krishna N. Reddy  and
Clifford H. Koger
Vijay K. Nandula*
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Daniel H. Poston
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Krishna N. Reddy
Affiliation:
USDA-ARS Southern Weed Science Research Unit, P.O. Box 350, Stoneville, MS 38776
Clifford H. Koger
Affiliation:
USDA-ARS Crop Genetics and Production Research Unit, P.O. Box 345, Stoneville, MS 38776
*
Corresponding author's E-mail: [email protected]
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Abstract

The effect of formulation and adjuvants on absorption and translocation of 14C-clethodim was determined at 1, 4, 12, 24, 48, and 72 h after treatment (HAT) in bermudagrass under greenhouse conditions. Absorption of 14C-clethodim with the 0.12 kg L−1 (15 to 85%) formulation was higher than with the 0.24 kg L−1 (5 to 40%) formulation, regardless of presence or absence of adjuvant. There was considerable variation in the effect of adjuvant on 14C-clethodim absorption. When either ammonium sulfate (AMS) or AMS plus crop oil concentrate (COC) was added to the 0.12 kg L−1 formulation, 14C-clethodim absorption increased significantly at all harvest times except at 12 HAT compared with 0.12 kg L−1 formulation alone, whereas, 14C-clethodim absorption after addition of COC to the 0.12 kg L−1 formulation was similar to the 0.12 kg L−1 formulation alone up to 24 HAT. Conversely, COC enhanced 14C-absorption at all harvest times when added to 0.24 kg L−1 formulation. Most of 14C-clethodim (79 to 100% of absorbed) remained in the treated leaf, independent of formulation or adjuvant. Formulation did not have an impact on distribution of absorbed 14C-clethodim; however, presence of an adjuvant increased movement of 14C-clethodim out of treated leaf. Of the absorbed 14C-label, most remained in the treated leaf. 14C-clethodim that translocated out of the treated leaf remained in the shoot, and negligible amount of 14C-clethodim translocated to roots. These results demonstrated improved absorption of clethodim with formulations containing half the active ingredient (0.12 kg L−1) and inclusion of both AMS and COC.

Keywords

Clethodimbermudagrass, Cynodon dactylon (L.) Pers. CYNDAAbsorptionadjuvantautoradiographydistribution
Type
Research Article
Information
Weed Science , Volume 55 , Issue 1 , February 2007 , pp. 6 - 11
Copyright
Copyright © Weed Science Society of America 

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