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Effect of Soybean (Glycine max) Row Spacing on Chemical Control of Sicklepod (Cassia obtusifolia)

Published online by Cambridge University Press:  12 June 2017

David R. Shaw ,
Stacey A. Bruff  and
Clyde A. Smith
David R. Shaw
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Stacey A. Bruff
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Clyde A. Smith
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
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Abstract

Sicklepod control with seven chemical treatments was evaluated in 25-cm and 97-cm soybean row widths. Metribuzin applied preplant incorporated followed by metribuzin applied preemergence, and metribuzin applied preplant incorporated followed by either imazaquin or chlorimuron applied postemergence controlled sicklepod over 90% early in the season, and row spacing did not influence control at that evaluation. In late season ratings, all herbicide treatments controlled sicklepod better in 25-cm rows than in 97-cm rows. However, only imazaquin applied sequentially or metribuzin followed by chlorimuron in 25-cm rows controlled sicklepod greater than 80% late in the season. Sicklepod control in 25-cm row soybean with either imazaquin or metribuzin plus chlorimuron applied preplant incorporated was equivalent to or better than sequential preemergence and postemergence treatments of these three herbicides in 97-cm rows. All treatments resulted in lower yields than the weed-free check in the 97-cm rows, whereas all herbicide treatments except the sequential application of metribuzin gave yields equivalent to the weed free check in 25-cm rows.

Keywords

Chlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acidimazaquin, 2-[4,5-dihydro-4-methyl-4-(l-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onesicklepod, Cassia obtusifolia L. ♯ CASOBsoybean, Glycine max (L.) Merr. ‘Centennial’ChlorimuronimazaquinmetribuzinCASOB
Type
Research
Information
Weed Technology , Volume 5 , Issue 2 , June 1991 , pp. 286 - 290
Copyright
Copyright © 1991 Weed Science Society of America 

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References

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