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Effects of DMPA (Zytron) on Colonial Bentgrass, Kentucky Bluegrass, and Red Fescue Root Growth¹

Greenhouse and laboratory tests were designed to study root and foliar response of colonial bentgrass, Kentucky bluegrass, and red rescue to various application rates of granular DMPA. Bentgrass, a pest in the Kentucky bluegrass-red rescue lawn, has exhibited injury from DMPA. The object of this study was to observe the selectivity and nature of the injury.

In the greenhouse test it was found that most rates of granular DMPA reduced the turf quality of colonial bentgrass and red rescue. All rates reduced root weights of the three grasses.

When grown on treated soil, adventitious roots of bentgrass which formed on the stolen nodes were unable to penetrate the soil surface. In comparison to the check, they were thicker and had root hairs and lateral roots closer to the root tips. Tips from several treatments had root hairs growing on the extremity of the root. Since root hairs and lateral roots are located in mature zones of the root, it was concluded that a reduction of meristematic activity occurred when bentgrass roots were grown in contact with DMPA.

The inability of adventitious roots to penetrate the soil surface would account for the reduced root weight and also the reduced turfgrass quality of treated bentgrass plants.

² Former graduate assistant and Associate Professor, Department of Agronomy and Mechanized Agriculture, University of Rhode Island.

Received for publication October 22, 1966.