Degree Name

Master of Science (MS)

Semester of Degree Completion

1991

Thesis Director

Roger Darding

Abstract

A field test was conducted to determine the effectiveness of various concentrations of selected plant growth regulators. All PGR's were applied at various rates and combinations on rough turf at Coles County Airport, Charleston, Illinois.

The dominant grasses in the test site were bluegrass (Poa pratensis Huds.) and fescue (Poa pratensis L.).

The plant growth regulators were evaluated at regular intervals for the reduction of biomass, reduction of height, seedhead suppression, and color relative to control.

One third ounce per acre Escort in combination with 4 ounces per acre Embark was the most effective in reducing biomass accumulation followed by 1/4 ounce per acre Oust.

Subjective visual studies were performed to determine the amount of height reduction. One third ounce Escort with 1/4 pint Embark was the most effective followed by 1/4 ounce per acre Oust. One third ounce Escort with 1/4 pint Embark was also the most effective at reducing the production of seedheads followed by 1/4 ounce per acre Escort. One third ounce Escort with 1/4 pint Embark was the only treatment to display a significant injury in the form of discoloration during one sampling period.

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