Portal de Periódicos da CAPES

Annual Bluegrass Control and Tolerance of Kentucky Bluegrass and Perennial Ryegrass to Ethofumesate

1988; American Society for Horticultural Science; Volume: 23; Issue: 3 Linguagem: Inglês

10.21273/hortsci.23.3.565

2327-9834

Peter H. Dernoeden, Thomas R. Turner,

Turfgrass Adaptation and Management

Abstract Various rates of ethofumesate were evaluated for annual bluegrass ( Poa annua L.) control in a perennial ryegrass ( Lolium perenne L.) fairway. The tolerance of ‘Merion’, ‘Mystic’, and a blend of Kentucky bluegrasses ( Poa pratensis L.) to ethofumesate also was assessed. Ethofumesate at 0.84, 1.1, and 0.84 + 0.84 kg·ha –1 provided poor annual bluegrass control; 2.2 and 1.1 + 1.1 kg·ha –1 provided good control; and 2.2 + 1.1 and 2.2 + 2.2 kg·ha –1 provided excellent control. Overall quality of Kentucky bluegrass was only slightly reduced by ethofumesate at 1.1 or 2.2 kg·ha –1 ; however, split applications at 2.2 + 1.1 and 2.2 + 2.2 kg·ha –1 severely reduced bluegrass cover and overall quality for 7 months. Foliar growth of sequentially treated Kentucky bluegrass appeared suppressed throughout fall and winter. Between January and April, Kentucky bluegrass plots treated with split applications of 2.2 + 1.1 or 2.2 + 2.2 kg·ha –1 had a dark-green color. No visual injury was observed in perennial ryegrass. Ethofumesate applied at 2.2 or 1.1 + 1.1 kg·ha –1 provided the best combination of safety to Kentucky bluegrass and control of annual bluegrass. Chemical names used: (±)-2-ethoxy-2,3-dihydro-3,3-dimethyl-5-benzofuranyl methanesulfonate (ethofumesate).