I wrote about this last year at http://davesgarden.com/community/forums/t/812284/ . The tree lost almost every leaf this winter, but started to grow again in the spring and is now outside. It looks very healthy - no scale or other bugs common to this plant, but it is now developing brown circular spots as shown.
The tree is about 30 years old and about 3 feet high in the pot and has produced beautiful lemons ( http://davesgarden.com/community/forums/fp.php?pid=4521152 ). The only difference is that I started watering it occasionally with compost tea from our own vermiculture bin.
Any suggestions? If it suffers a bad summer I am afraid I will lose this tree when I take it inside for the winter .
