How can you tell you have used enough Trimmit?

Some superintendents really hate poa – and with good reason, if they have bentgrass greens. Recently, we encountered a situation where the superintendent had reduced poa in all of the greens using Trimmit (paclobutrazole) growth regulator at a rate of 12 oz/acre, sprayed every 14 days over a period of 6 months. Unfortunately, two greens with poor air movement and shade exhibited some strange symptoms following the repeated use of Trimmit. No pathogens or insects were involved with the symptoms…