Chase Best said: Mel, do you see an issues with 4 oz/a weekly on primo.
I'm not sure if I might or not, just from my experience of going at 3 oz/acre before compared to the 6 oz rate now, the 200 gdd is still the main key. I would get regulation at the 3 oz rate, but did see some clipping yields go up the day or two before as I neared hitting the 200 gdd threshold, with the 6 oz rate, I'm not seeing any changes in clipping yields (and I've mowed the day before I spray so I know I am getting accurate data, well, as accurate for me, I probably should weigh it to be really accurate, but I'm dumping after the same number of greens). If it gets really hot, you might start seeing some rebounding at 6 days, I don't expect the 6 oz rate to hurt you, but looking at last years records I didn't spray 6 oz per acre until September. I have been spraying 6 oz this season with no problems at 7 to 8 day intervals.
I know and I understand the desire to spray on a set day every week, as I have sprayed on a Saturday, then the past 2 Sundays, and just about any day but Thursdays, luckily I haven't had an complaint or issue with players. Inserting the temps for the next 10 days, I'm actually going to make it to next Monday to spray if everything stays as it is. But for me the best results using just Primo at the 6 oz rate, following the 200 gdd is my guide.
Mel