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Growth and Interaction of Bermudagrass (Cynodon dactylon) by Cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  12 June 2017

Paul E. Keeley  and
Robert J. Thullen
Paul E. Keeley
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shatter, CA 93263
Robert J. Thullen
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shatter, CA 93263
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Abstract

Several weed-free and bermudagrass competition periods were established and maintained in cotton to evaluate their influence on cotton yields and reproduction of bermudagrass. Cotton sprayed with fluazifop for bermudagrass control 4 or 8 weeks after emergence yielded 93 and 90% as much as weed-free cotton. This compared to losses of 16 and 26% when bermudagrass was permitted to compete with cotton for 12 and 25 weeks, respectively. Cotton handweeded for 8 to 12 weeks yielded the same as weed-free cotton and 9% more than cotton weed free for only 4 weeks. Bermudagrass seed production was prevented and rhizome production was negligible when weed competition did not exceed 8 weeks and weed-free periods exceeded 4 weeks. Bermudagrass produced significant amounts of seeds (45 to 88% of weedy checks) and rhizomes (9 to 31% of weedy checks) in plots weed free for 4 weeks and in plots where control was delayed for 12 weeks. Cotton grades were reduced because the cotton lint was contaminated with grass in plots weed free for only 4 weeks, and in plots where bermudagrass competed for 25 weeks.

Keywords

Bermudagrass, Cynodon dactylon (L.) Pers. # CYNDAcotton, Gossypium hirsutum L. ‘Acala SJ-2’fluazifop, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidCotton yieldweed seed and rhizome productioncotton gradesweed competitionCYNDA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 39 , Issue 4 , December 1991 , pp. 570 - 574
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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