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Itchgrass (Rottboellia exaltata) Response to Control Practices in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Paul R. Nester ,
Thomas R. Harger  and
James P. Geaghan
Paul R. Nester
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana State Univ., Baton Rouge, LA 70803
Thomas R. Harger
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana State Univ., Baton Rouge, LA 70803
James P. Geaghan
Affiliation:
Dep. Exp. Stn., Louisiana Agric. Exp. Stn., Louisiana State Univ., Baton Rouge, LA 70803
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Abstract

Field studies were conducted to document the response of itchgrass [Rottboellia exaltata (L.) L.f. ♯3 ROOEX] in soybean [Glycine max (L.) Merr. ‘Forrest’] to selected herbicides and postplanting cultivation. Early cultivation stimulated emergence of itchgrass seedlings; however, when plots were cultivated two or three times, itchgrass was effectively removed from the tilled area. Cultivation had no effect on the density, height, standing biomass, or seed production of itchgrass plants in the soybean row but did increase soybean yield. In response to a density reduction of 90%, the average weight, number of tillers and branches, and seed production of single itchgrass plants increased by a factor of 2.9, 3.1, 2.3 and 2.6, respectively, in trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine)-treated plots. Individual plants did not increase growth following density reduction by a postemergence application of diclofop {2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic acid}. Itchgrass plants competing for the entire season in plots treated with trifluralin reduced soybean yield approximately 21 g per weed, while itchgrass recovering from diclofop treatment and competing the remainder of the season reduced yield approximately 5 g per weed.

Keywords

TrifluralinalachlordiclofopcultivationthresholdROOEX
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 32 , Issue 6 , November 1984 , pp. 807 - 812
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

Literature Cited

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