Fan Tex Ash Tree -- Second Opinions
Hello all. Happy Independence Day weekend!
First post. Hoping I'm doing this right. I've searched the web, this site, and visited my local nursery, but still have a couple questions. Hoping for some knowledge-sharing...
I have a small yard with a single Fan Tex Ash tree in the middle. My local nursery helped me pick it out and they planted it last October (2010). I like the tree and has matured noticeably since it was planted 9 months ago (went dormant for a couple months during Winter).
I'm deep-watering it once per week (each Saturday or Sunday) with a hose. No watering system yet. I allow the water to trickle, at about 15-20 gallons per hour, for 5-6 hours. So, I'm giving it about 100 gallons once per week.
It's Summer in the Phoenix, AZ area, so it's very hot and dry right now.
Here are my questions/concerns:
1) My nursery has told me that I do not need to fertilize the tree because it gets everything it needs out of the ground. Everyone agree?
2) My nursery (stopped by today) has suggested that I water the tree twice per week during the Summer (instead of once), and not quite as deep/long as I am doing. So water more often, with less water. Everyone agree?
3) The leaves got cut up pretty badly this Spring. See pics below of round pieces cut out of the edges of the leaves. From my research, I'm pretty sure this is the work of leaf-cutter bees, and that I should just let the bees do their thing. I understand that the tree is not really harmed by this, and that we need to be good to the bees. Does everyone agree that my leaves are being hit by leaf-cutter bees?
4) Finally, and most concerning at the moment, is that large brown crispy spots have begun appearing on leaves just in the past 5 days. Pics below. I estimate that only 5-10% of the leaves have these large brown spots, but the number seems to be increasing each day. I took a sample to my nursery this morning, and was told that it is some type of insect (I don't remember what type), and that I shouldn't worry too much about it. I noticed that some of their Fan Tex Ash trees had identical-looking brown spots.
Sorry for the long post. Hoping for some help with my questions. Thanks a lot everyone.
My Fan Tex Ash:
Large brown spots on leaves: