Does anyone have any experience with any older pink weeping cherrys (15 years +) suddenly stopping in any sign of foliage growth? The problem began this past spring, after I had used systemic Merit for a suspected influx of borers I had detected at the base of the tree the prior fall. Once I had used the Merit, had done my yearly deadwooding and pruning out of the watersprouts that go through the middle, and had fertilized (as I always do every year), the thing literally stopped growth in it's tracks, and I mean, for the remainder of the whole growing season! Now, I know S. Ohio had a big drought this year. Before this week, we were still easily afoot of rain down year-to-date.(I'm a green industry person too) So, I was sure to compensate for that by using plenty of irrigation. And when I approached Bayer on their website with the (subtle but firm) thought that there may be an outside possibility that Merit could stunt certain plant types- I got a very cold shoulder! Any ideas from you?