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Preemergence Herbicide Effects on Bermudagrass (Cynodon dactylon) Interference in Sugarcane (Saccharum spp. hybrids)

Published online by Cambridge University Press:  12 June 2017

E. P. Richard Jr.
E. P. Richard Jr.*
Affiliation:
Sugarcane Res. Unit, Agric. Res. Serv., U.S. Dep. Agric, P.O. Box 470, Houma, LA 70361
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Abstract

The effect of annual spring PRE applications of fenac, metribuzin, and terbacil on the competitiveness of sugarcane with bermudagrass during a 3-yr crop cycle was evaluated. For each herbicide treatment, bermudagrass was allowed to interfere with sugarcane during the growing season for 0, 1 (plant-cane crop only), 2 (plant-cane and first-ratoon crops), or 3 (plant-cane through second-ratoon crops) yr. Predicted total yields of cane from the three harvested crops was 3600 kg ha−1 higher on average in plots maintained free of bermudagrass and treated with metribuzin than where fenac and terbacil were applied. Bermudagrass biomass increased with each growing season. Greatest biomass production occurred in the fenac plots and the smallest in terbacil plots. Bermudagrass did not reduce the predicted total yields of cane where metribuzin or terbacil was applied. With fenac, predicted total cane yields were 4, 7, and 11% lower than the weed-free control where bermudagrass interference was allowed for 1, 2, and 3 yr, respectively. Season-long bermudagrass interference in the fenac plots reduced actual cane yields 10% (plant-cane crop), 6% (first-ratoon crop), and 14% (second-ratoon crop) when compared with plots maintained free of bermudagrass for the entire growing season.

Keywords

Fenac, 2,3,6-trichlorobenzeneacetic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneterbacil, 5-chloro-3-(1,1-dimethylethyl)-6-methyl-2,4-(1H,3H)-pyrimidinedionebermudagrass, [Cynodon dactylon (L.) Pers. # CYNDA]sugarcane (a complex hybrid of Saccharum spp. ‘CP 65-357’)Competitionfenacmetribuzinterbacil
Type
Research
Information
Weed Technology , Volume 7 , Issue 3 , September 1993 , pp. 578 - 584
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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