Ask The Plant Expert: I bought an Avocado Tree a couple of months ago and planted it outside. My soil is a sandy soil, and I live in south Texas. The heat here has been horrendous! I made a Teepee with a screen around two sides to keep the western sun out. I don't know if somethings attacking my tree or if it's heat related. My leaves turn brown and get brittle and fall off. No new leaves are growing back. -Bob Flower Shop Network Plant Expert Reply: Bob, It may have Sun Blotch. It is hard to tell from the picture, but if you can take a leaf from your plant to the nearest Texas extension service office, they should be able to send it off to their plant diagnostic center. For more information take a look at this website http://plantclinic.tamu.edu/. Please let me know if I can help with anything else. Share this:Click to print (Opens in new window)Click to email a link to a friend (Opens in new window)Click to share on Facebook (Opens in new window)Click to [...]