• Trials comparing two closing dates (grower vs grower +12 or +16 days) and five trinexapacethyl (Moddus®) treatments were carried out on Fescue-lolium hybrid cv “Ultra” at Methven and Somerton in mid Canterbury.
• At Methven there was no difference in seed yield for either closing date, while at the Somerton the later closing date resulted in 124 kg/ha more seed on average.
• The data suggests the optimum closing date for irrigated ‘Ultra’ is Nui +28 days; i.e. the first week of November (a week later than typically practised).
• The optimum Moddus rate was 1.6 L/ha (400 g/ha trinexapac-ethyl).
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