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Control of Perennated Bermudagrass (Cynodon dactylon) and Johnsongrass (Sorghum halepense) in Sugarcane (Saccharum spp. hybrids)

Published online by Cambridge University Press:  12 June 2017

Edward P. Richard Jr.*
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, Sugarcane Research Unit, P.O. Box 470, Houma, LA 70361

Abstract

In two separate field experiments conducted over time, at-planting preemergence (PRE) applications of sulfometuron at 110 to 150 g ai/ha followed by March applications of sulfometuron at 30 g/ha or metribuzin at 2,580 g ai/ha at the start of the initial (plant cane) growing season controlled more bermudagrass and johnsongrass emerging in sugarcane from rhizome and stolon pieces than standard at-planting followed by March applications of atrazine at 2,240 g ai/ha (no control), metribuzin at 2,580 g ai/ha, or pendimethalin at 2,240 g ai/ha. Treatments containing at-planting applications of imazapyr at 280 g ai/ha or thiazopyr at 560 g ai/ha did not provide levels of control similar to sulfometuron. Crop injury in excess of 10% occurred only when imazapyr at 280 g/ha (18 to 42%) or sulfometuron at 30 g/ha (11 to 32%) was applied in March to emerging sugarcane. Sugarcane stalk numbers, stalk heights, and ultimately cane and sugar yields were increased when compared to the standards with all sulfometuron treatments and when thiazopyr was applied at planting and again in March.

Type
Research
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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