Thuja damage. what to do?

Hi Folks,

I'm hoping someone can help me with this. We planted 5 Thujas about a year and a half ago and they have been fine and beginning to grow but over the last few weeks I've noticed damage on the right side (south side) of the ones getting the most sun and I can't pinpoint the cause.

I'm in Dallas Tx and for us it was a pretty mild summer. Much hotter last year and they did fine so I dont know if this is sun or something else.

This is the row of them. The fence is west so they get morning sun and the ones with the most damage get a lot of afternoon sun.

Thumb of 2021-09-16/texmaster/087d7d

close up

Thumb of 2021-09-16/texmaster/de9ecb

Thumb of 2021-09-16/texmaster/87c8b1

The one next to it on the left (north)

Thumb of 2021-09-16/texmaster/330d2c


They are watered automatically via drip line
 

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