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Preemergence Control of Itchgrass (Rottboellia cochinchinensis) and Johnsongrass (Sorghum halepense) in Sugarcane (Saccharum spp hybrids) with Pendimethalin and Prodiamine

Published online by Cambridge University Press:  12 June 2017

Rex W. Millhollon
Rex W. Millhollon*
Affiliation:
Sugarcane Res. Unit, Agric. Res. Serv., U.S. Dep. Agric., Houma, LA 70361
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Abstract

Preemergence control of itchgrass in sugarcane with nonincorporated pendimethalin and prodiamine increased as rate for each herbicide increased from 2.2 to 3.4 kg ai ha-1. Itchgrass control at 3.4 kg ha-1 was similar for both herbicides, ranging from 78 to 94% (86% mean) for pendimethalin in six field experiments and 83 to 91% (86% mean) for prodiamine in three experiments. Incorporated trifluralin at 2.2 kg ha-1, the standard, gave 99% mean control of itchgrass. None of the nonincorporated treatments with pendimethalin or prodiamine consistently prevented a decrease in the sugarcane stalk population at harvest. Asulam applied postemergence at 3.7 kg ae ha-1 controlled itchgrass that survived the preemergence herbicides, and sugarcane stalk populations were maintained. Preemergence control of johnsongrass with nonincorporated treatments of pendimethalin or prodiamine at 2.8 kg ha-1, in a mixture with atrazine at 2.2 kg ai ha-1, ranged from 86 to 95% (89% mean) for pendimethalin and 80 to 95% (88% mean) for prodiamine. Metribuzin at 2.2 kg ha-1, the standard, gave 97% mean control of johnsongrass. Mixtures of pendimethalin with metribuzin or terbacil generally gave more effective control of johnsongrass than mixtures with atrazine. When used in conjunction with other herbicides, nonincorporated pendimethalin and prodiamine were effective alternatives to soil-incorporated treatments for weed control in sugarcane.

Keywords

Sodium salt of asulam, methyl[(4-aminophenyl)sulfonyl] carbamateatrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminemetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamineprodiamine, N3,N3-di-n-propyl-2,4-dinitro-6-(trifluoromethyl)-m-phenylenediamineterbacil, 5-chloro-3-(1,1-dimethylethyl)-6-methyl-2,4-(1H,3H)-pyrimidinedionetrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamineitchgrass, Rottboellia cochinchinensis (Lour.) Clayton [=Rottboellia exaltata (Lour.)Clayton] # ROOEXjohnsongrass, Sorghum halepense (L.) Pers. # SORHAsugarcane, interspecific hybrids of Saccharum.Asulamatrazinemetribuzinterbaciltrifluralindinitroaniline herbicidessugarcane weedsROOEXSORHA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 41 , Issue 4 , December 1993 , pp. 621 - 626
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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