I'm guessing its just a response to the cold soil temperatures we had this winter. When soils are cool, plants (especially citrus) have a hard time pulling nutrients out of the soil. When the weather warms up the symptoms usually dissapear. This is one reason why it isn't beneficial to fertilize in the winter - plant roots are pretty inactive at this time of year and can't process the nutrients. As long as you followed the recommended amounts when applying your fertilizer your tree should be fine. In case you need more information on fertilizing, use the U of A publication located at the link below. A guide to common nutrient deficiencies and herbicide damage can be found at http://cals.arizona.edu/pubs/crops/az1007/contents.html Here is a link that might be useful: Fertilizing citrus

Mystic I appreciate the kind offer but these daylilies come back year after year and bloom nicely and I have a lot of them. I must say that they are my favorite daylily though. They look so natural here in the mountains. These daylilies bloomed nicely this year also; it's just that after they finish they always turn ugly, yellow and brown. Somebody should jump on your offer because the wild type daylilies are wonderful in my opinion.

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We need to know all of the following in order to make any kind of meaningful comments :-) your geographic location - state and largest big city what kind of tree when was it planted (if you know) usual summer weather and watering practices and as many clear photos as you can manage...the tree as a whole, shots of the branches with dead leaves and close ups of the leaves (front and back) as well. Fwiw, some trees will have assorted leaves dry and brown a bit in summer and also many that will tend to hold their leaves very late into the season and even through winter. Does not necessarily mean the tree is sick or ailing.