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Kentucky Bluegrass Tolerance to Consecutive Preemergence Herbicide Treatments¹

Herbicides are one of several management practices necessary to maintain good quality, weed-free turf. To be acceptable, they must control weeds without causing turfgrass injury. An experiment was conducted on Congaree loam (Fluventic Dystrochrepts) in the mountain region of Georgia to determine the effects of consecutive annual herbicide treatments on six Kentucky bluegrass (Poa pratensis L.) cultivars.

Standard rates of DCPA (dimethyl tetrachloroterephthalate), bensulide [O,O-diisopropyl phosphorodithioate S-ester with N-(2-mercaptoethyl) benzenesulfonamide], benefin (N-butyl-N-ethyl-a,a,a-trifluoro-2,6-dinitro-p-toluidine), or oxadiazon [2-tert-butyl-4-(2,4-dichloro-5-isopropoxyphenyl)–²–l ,3,4-oxadiazolin-5-one] affected the quality and stand of Kentucky bluegrass cultivars very little. However, oxadiazon applied at the 3X rate reduced the quality of all cultivars in early spring and the stands of ‘Victa’, ‘Merion’, and ‘common’ in late summer when compared with bensulide. Benefin applied at the 3X rate reduced the quality of ‘Adelphi’, ‘Vantage’, Victa, and ‘Fylking’, but not stand when compared with the recommended benefin treatment. Neither napropamide [2-(a-naphthoxy)-N,N-diethylpropionamide] or prosulfalin {N-[[4-(dipropylamino)-3,5-dinitrophenyl]sulfonyl]-S-S-dimethylsulfilimine} should be applied to Kentucky bluegrass cultivars because of severe injury.

Key Words: Turfgrass • Quality • Stand • Weed control • Digitaria sanguinalis L. Scop • Poa Pratensis L.

² Professor of agronomy.

Received for publication March 26, 1982.