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Yellow Nutsedge (Cyperus esculentus) Management and Tuber Reduction in Bermudagrass (Cynodon dactylon × C. transvaalensis) Turf with Selected Herbicide Programs 1

  • David B. Lowe (a1), Ted Whitwell (a1), S. Bruce Martin (a2) and Lambert B. Mccarty (a1)

Abstract

A 4-yr field study was conducted to evaluate yellow nutsedge suppression in ‘Tifway’ bermudagrass. Herbicide programs included preemergence (PRE) applications of metolachlor (3.4 kg ai/ha) and postemergence (POST) applications of imazaquin (0.28 kg ai/ha) plus MSMA (2.2 kg ai/ha) or halosulfuron (0.07 kg ai/ha) plus MSMA (2.2 kg/ha). Herbicides were applied to the same plots each year. Yellow nutsedge shoot suppression and tuber numbers were determined each year. Suppression of yellow nutsedge shoots increased over the 4-yr period from <74% in 1993 to >83% by 1996 with two annual applications of imazaquin plus MSMA or halosulfuron plus MSMA. PRE metolachlor applications did not suppress shoot production in any year; nor did they enhance suppression from POST treatments. Sequential applications of halosulfuron plus MSMA and imazaquin plus MSMA increased shoot suppression by 17 to 24% at 3 mo after initial treatment (MAIT) compared to single applications. All treatments reduced tuber numbers (>60%) after 4 years compared to untreated plots.

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Corresponding author

Corresponding author's E-mail: lowe@clemson.edu.

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1 Technical Contribution 4492 of the South Carolina Agricultural Experiment Station, Clemson University.

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References

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