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Effect of Commonly used Turfgrass Herbicides on Bermudagrass (Cynodon dactylon) Root Growth

Published online by Cambridge University Press:  12 June 2017

Frederick M. Fishel
Affiliation:
Dep. Plant Pathol. Weed Sci., Mississippi State Univ., Mississippi State. MS 39762
G. Euel Coats
Affiliation:
Dep. Plant Pathol. Weed Sci., Mississippi State Univ., Mississippi State. MS 39762

Abstract

Experiments were conducted in 1990 and 1991 to determine bioavailability of PRE herbicides at three soil profile depths and two soil types in established common bermudagrass sods. Prodiamine and oryzalin reduced ‘Tifgreen’ bermudagrass root growth in the 5- to 7.5-cm layer of a Bosket very fine sandy loam soil at 2 and 4 wk after treatment in 1991. These herbicides decreased bermudagrass root weight in both the Bosket and Marietta sandy clay loam both years in samples taken from the 2.5- to 5-cm depth layer. In the 0- to 2.5-cm soil layer, all herbicides reduced root weight in 1990. In a bioassay, prodiamine caused decreased Tifgreen bermudagrass root growth at concentrations as low as 4 ppb by wt in the very fine sandy loam soil, while 8 ppb was necessary in the sandy clay loam soil. Prodiamine was detected in the very fine sandy loam at 4 wk after treatment at all depths in 1991 (65, 45, and 39 ppb in the 0- to 2.5-, 2.5- to 5-, and 5- to 7.5-cm soil layers, respectively). Oryzalin was also detected at all depths in 1991 when sampled at 2 and 4 wk after treatment in the very fine sandy loam. Pendimethalin was present in concentrations of 38, 39, and 37 ppb in the sandy clay loam at 2 wk after treatment in the 0- to 2.5-, 2.5- to 5-, and the 5- to 7.5-cm soil layers, respectively. Pendimethalin was also detected in the very fine sandy loam at 2 wk after treatment at concentrations of 55, 69, and 36 ppb in the 0- to 2.5-, 2.5- to 5-, and 5- to 7.5-cm soil layers, respectively.

Type
Soil, Air, and Water
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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Effect of Commonly used Turfgrass Herbicides on Bermudagrass (Cynodon dactylon) Root Growth
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