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Tolerance of Weeping Lovegrass Cultivars to Herbicides¹

Weeping lovegrass [Eragrostis curvula (Schrad.) Nees] is relatively easy to establish if weed infestations arc not serious. The purpose of our research was to evaluate the response of ‘Morpa’ and ‘Rennet’ weeping lovegrass to 27 pro- and post-emergence herbicides. Weeping lovegrass was grown in a 1:1:1 Blelberville day (Udlc pellnstcrt): sand:peat moss mixture in small pots. Five to 10 plants were grown in each pot with five replications (pots) per treatment. All herbicides were sprayed in water at a spray volume of 93.5 liter/ha. All herbicides were sprayed at rates of 0.6, 1.1, and 2.2 kg/ha. Herbicide and/or dead plants per pot 14 days after treatment. Morpa and Rennet were tolerant to preoemergence applications of propazinc [2-ddoro-4, 6-bis(isopeopylamino)-s-trlazine] and butylate (S-ethyl isobutylthlocarbamate). Morpa also showed little phytotoxiclty to 0.6 and 1.1 kg/ha of atrazlne [2-chloro-4-(ethylamino)-6-(isopropylamino)- s-trlazlne] and p~razon [5-amino-4-chloro-2-phenyl-3(2H)-pyrldazlnone] and 0.6 kg/ha of dinron [3-(3,4-dlchlorophenyl)-l, 1-dlmethylurea]. Rennet tolerated the pre-emergence applications of atrazlne, dluron, and propachlor (2-chloro-N-isopropylacetanilidc) 0.6 kg/ha. Acltluorfen 15-[2-chloro-4-(trittuorometh~l) phenoxyl]-2- nltrobenzolc acldl and atrazine (pre-emergence) were much more phytotoxlc to Rennet than Morpa. Post-emergence herbicides showing the least injury to both cultivars were barban (4-chloro-2-but~nyl m-chlorocarbanilate] and bromoxynil [3,5-dlbromo-4-hydroxybenzonitrile]. Other herbicides warranting further study as post-emergence sprays included asulam (methyl sulfanilylcarbamate), atrazine, blfenox [methyl 5-(2,4-dichlorophenoxy)-2-nitrobenzoate], and pyrazon. For both pre- and post-emergence herbicides, Renner was generally more susceptible to herbicide damage than Morpa.

Key Words: Desiccation • Phytotoxic • Pre-emergence • Post-emergence • Morpa • Renner • Weeds • Weed Control

² Research agronomist and geneticist, USDA-ARS, Dep. Range Science, Texas A&M Univ., College Station, TX 77843 and Grassland, Soil and Water Res. Lab., Temple, TX 76503.

Received for publication March 22, 1982.