Unwanted grass species on turfgrass cause big problems, because they lower the quality of turf and are difficult to be selectively controlled. The aim of this study was to assess the selectivity to turfgrass for some herbicides which could be used to control grass weeds. Five different turfgrass species were sown on 24/09/1998, i.e. Festuca arundinacea (cv. Barbizon), Festuca rubra ssp rubra (cv. Boreal), e Festuca rubra ssp commutata (cv. Tatjana), Lolium perenne (cv. Numan) and Poa pratensis (cv. Baron). When swards had uniformily established, each plot was splitted into five subplots to accommodate five different herbicide treatments, i.e. pendimethalin (1000 g a.i. ha-1), pendimethalin (1500 g a.i. ha-1), fenoxaprop-p-ethyl (98 g a.i. ha-1), fenoxaprop-p-ethyl (196 g a.i. ha-1) and untreated control. The resulting experimental design was a split-plot with three replicates, with turfgrass species as main plots and herbicide treatments as sub-plots. Herbicides were sprayed on 3/05/99 (pendimethalin) and 9/06/99 (fenoxapropo-p-ethyl). No weed species emerged and thus herbicide selectivity was evaluated by measuring fresh and dry weigh of turfgrass biomass at each mowing time (nine times for pendimethalin and seven times for fenoxapropo-p-ethyl). Results showed that pendimethalin did not cause any apparent damage to none of the five turfgrass species. A slight decrease in weight of treated swards was observed with both doses, but differences were never statistically significant. Fenoxaprop-p-ethyl did not cause any phytotoxicity on Lolium perenne and Festuca rubra (both subspecies). Otherwise, Poa pratensis and Festuca arundinacea were damaged by both doses of fenoxaprop-p-ethyl, even though symptoms were transitory and swords recovered 50 (Poa pratensis) and 30 (Festuca arundinacea) days after treatment. As a conclusion, pendimethalin seems suitable to prevent the emergence of grasses on turfgrass, while fenoxaprop-p-ethyl can be used to control emerged weeds, even though same care is necessary with the latter herbicide, because its selectivity did not prove to be always perfect.
Selectivity of some herbicides for controlling grass weeds in turfgrass
PANNACCI, Euro
2000
Abstract
Unwanted grass species on turfgrass cause big problems, because they lower the quality of turf and are difficult to be selectively controlled. The aim of this study was to assess the selectivity to turfgrass for some herbicides which could be used to control grass weeds. Five different turfgrass species were sown on 24/09/1998, i.e. Festuca arundinacea (cv. Barbizon), Festuca rubra ssp rubra (cv. Boreal), e Festuca rubra ssp commutata (cv. Tatjana), Lolium perenne (cv. Numan) and Poa pratensis (cv. Baron). When swards had uniformily established, each plot was splitted into five subplots to accommodate five different herbicide treatments, i.e. pendimethalin (1000 g a.i. ha-1), pendimethalin (1500 g a.i. ha-1), fenoxaprop-p-ethyl (98 g a.i. ha-1), fenoxaprop-p-ethyl (196 g a.i. ha-1) and untreated control. The resulting experimental design was a split-plot with three replicates, with turfgrass species as main plots and herbicide treatments as sub-plots. Herbicides were sprayed on 3/05/99 (pendimethalin) and 9/06/99 (fenoxapropo-p-ethyl). No weed species emerged and thus herbicide selectivity was evaluated by measuring fresh and dry weigh of turfgrass biomass at each mowing time (nine times for pendimethalin and seven times for fenoxapropo-p-ethyl). Results showed that pendimethalin did not cause any apparent damage to none of the five turfgrass species. A slight decrease in weight of treated swards was observed with both doses, but differences were never statistically significant. Fenoxaprop-p-ethyl did not cause any phytotoxicity on Lolium perenne and Festuca rubra (both subspecies). Otherwise, Poa pratensis and Festuca arundinacea were damaged by both doses of fenoxaprop-p-ethyl, even though symptoms were transitory and swords recovered 50 (Poa pratensis) and 30 (Festuca arundinacea) days after treatment. As a conclusion, pendimethalin seems suitable to prevent the emergence of grasses on turfgrass, while fenoxaprop-p-ethyl can be used to control emerged weeds, even though same care is necessary with the latter herbicide, because its selectivity did not prove to be always perfect.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
