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Wheat (Triticum aestivum) Cultivar Tolerance and Italian Ryegrass (Lolium multiflorum) Control with Diclofop, BAY SMY 1500, and Metribuzin

Published online by Cambridge University Press:  12 June 2017

David R. Shaw  and
M. Todd Wesley
David R. Shaw
Affiliation:
Dep. Plant. Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
M. Todd Wesley
Affiliation:
Dep. Plant. Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
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Abstract

In the field, 14 soft red winter wheat cultivars responded differently to 1.1 kg ai ha–1 diclofop, 1.7 kg ai ha–1 BAY SMY 1500, and 0.42 kg ai ha–1 metribuzin applied POST. Diclofop and metribuzin did not injure any cultivar more than 10% on a silty clay soil. However, BAY SMY 1500 injured ‘Pioneer 2551’ and ‘Coker 983’ 39 and 21%, respectively, in March. All other cultivars were injured less than 10% by BAY SMY 1500. Early injury did not translate into yield loss in the cultivar tolerance study. In an application timing study for Italian ryegrass control, late-season ratings indicated better control with two-leaf applications than with PRE applications for all treatments. Delaying application to the three-tiller stage reduced control with BAY SMY 1500 or metribuzin, but not with diclofop. On the sandier soil at this location, wheat injury with 0.28 or 0.43 kg ha–1 metribuzin or 2.2 kg ha–1 BAY SMY 1500 was sufficient to reduce wheat yield compared with other treatments, despite good Italian ryegrass control.

Keywords

Diclofop, (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acidBAY SMY 1500, 4-amino-6-(1,1-dimethylethyl)-3-(ethylthio)-1,2,4-triazin-5(4H)-onemetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneItalian ryegrass, Lolium multiflorum Lam. ♯ LOLMUwheat, Triticum aestivum L.Application timingLOLMU
Type
Research
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 776 - 781
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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