Lenno..
No problem here in southern middle TN, but we have not had a wet year here in my county.
The last half of May and most of June was quite dry here. End of June and first of July we have got a few good rains, and everything has greened back up nicely.
It was good timing for blackberries here, they have fattened up nicely, and I am sure it has helped the seng with berry production too.
Good Luck on your crop there. Sure do hate the thought of seng roots just rotting. Over the years (especially when we have wet springs and early summers) mine have suffered bad from the old yellow spot, and leaf melt. That happened a lot where I planted thick... I don't do that anymore.
TNhunter