• The application of different formulations of Trinexapac-ethyl increased seed yield by an average of 57% for perennial ryegrass and 47% for Italian ryegrass over the untreated control.
• There was no difference in seed yields between the three generic Trinexapac-ethyl formulations and Moddus® applied at similar application rates.
• A comparison of Moddus and Optimus® in Italian ryegrass resulted in no significant difference when compared on a volume rate or active ingredient rate. In perennial ryegrass, seed yields achieved with Optimus at 300 g TE/ha were similar to seed yields achieved with 400 g TE/haof Moddus, Trexel® and Trinity™,however no statistical difference was shown when all products were applied at 400 g a.i./ha. This result contradicts those from last season and is possibly explained by grazing management and the lodging response between seasons.
• All treatments showed a relationship between days to 50% lodging from anthesis and seed yield. In perennial ryegrass, seed yield increased by53 kg/ha for each extra day between anthesis and 50% lodging, until 17 days post anthesis when the increase became smaller. In Italian ryegrass, seed yields increased by 43 kg/ha for each day delay between anthesis and 50% lodging.
H73 Generic Trinexapac-ethyl products on ryegrass seed crops
