I started to see some of that Shirlee, just this morning. Not what I would call leaf streak though. And we have been bone dry. Where I saw it I had been overhead watering the last week.
I think of leaf streak as coming in Aug/Sept. Blotchy smaller patches first.
This surely doesn't look good though. I quickly turned mine over just to check for you know what.
Nope. Not that. Never had that, but I still always check.