February 12, 2005
Question: A couple of years ago we planted an avocado tree which is now about 12 feet tall. Until recently, it has grown and flourished well and we were looking forward to our first crop this year. However, over the last 3 to 4 weeks, the leaves have turned a rusty-brown and dropped off. There have been no variants with watering and no fertilizing has taken place. Do you have any ideas as to why the tree is defoliating?
- Lou, e-mail
Answer: Leaf loss from your avocado is probably due to an insect known as the avocado lace bug. It is a perpetual problem of some avocado trees. In fact, while avocado is listed as an evergreen tree, if infested with the lace bug it is effectively deciduous. In your case, allow the leaves to fall, as they will anyway. Practice good sanitation by immediately putting them in a bag and laying the bag curbside. The tree will soon regain new foliage. The problem may or may not recur next year. If it does, you must treat the tree early to avoid a repeat of the same situation. Usually a couple of insecticidal oil sprays in late spring and summer will control this pest. If not controlled, no permanent harm will come to the tree. The presence of the bug does not affect fruit production.
Stephen Brown is a horticulture agent with the Lee County Extension.
To submit questions call the horticulture desk at 461-7504 between 9 a.m. and 4
p.m. or via e-mail at
shb@mail.ifas.ufl.edu. Listen to the ‘Garden Show’ at 8 a.m. on
1200-AM WINK/WNOG.