Abstract
Overseeded rough bluegrass (Poa trivialisL. ‘Danish common’) and Italian ryegrass (Lolium multiflorumLam. ‘Gulf’) maintained under putting green conditions were more susceptible to benefin (N-butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-toluidine) and DCPA (dimethyl tetrachloroterephthalate) than creeping bentgrass (Agrostis palustrisHud. ‘Penn-cross’), red fescue (Festuca rubraL. ‘Dawson’), or perennial ryegrass (Lolium perenneL. ‘Medalist II’). February applications of 1.68 or 3.36 kg/ha of benefin and 6.72 or 13.44 kg/ha of DCPA caused significantly more discoloration and reductions in density than equivalent rates applied in March or April. Benefin was more injurious than DCPA to all overseeded species as judged by quality or density. DCPA caused significant delays in the breaking of dormancy of bermudagrass [Cynodon dactylon(L.) Pers. ‘Tifdwarf’].
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