HELP! Leland Cyprus Trees 'Browning'
I really need some advice here. Due to an unsightly neighbor we needed a "instant screen". After looking at lots of trees, I found a tree farm with some great looking full grown Leland Cyprus (10-14 ft. tall, 3-5" butt).
They delivered and planted 40 adult trees on 2/15/07, covering 250 ft, 6 ft. apart and laying East/West. They get full sun during the day from the South. The root ball was about 40" in diameter and 36" deep, wrapped in burlap and wire support. The soil is a red/sandy variety.
The owner stressed water, water, water until Fall, so we have watered the trees almost every other day since planting, using 2 circular sprinkers set at 180 degrees. This covers about 70-80 ft. each move and I run them for 3 hours, then move. The ground seems very moist. Note that our area is about 12" below normal on rainfall YTD. Also, I see other adult trees in the area that look great w/o obvious watering.
It started with 2 or 3 showing slight browning starting near the bottom, but now it is spreading, with 2-3 looking almost dead. I'd say 1/3 or more have significant browning.
I keep thinking not enough water, but is possible to have too much water?? Also, is there some test that can be done to determine waht this may be?
We have a lot of $$ in these trees, so I would hate to loose a bunch of them. The tree guy is of no help.