I think I see the "Christmas tree" green leaf vein pattern.....let some others chime in to agree or disagree before you run out and do anything but I think you may need to lightly broadcast some epsom salt (source of magnesium) around your tree. Be careful not to apply too much epsom salt or you could stress your tree out during dry weather.

yeah looks like it needs magnesium. Just threw about a cup on my Meyer today.

When you state "have fertilized the tree" - how much, what type, how often? How often do you water?

The tree looks like its not getting enough nutrition. Which could mean too little, fertilizer, or not enough or too much water.

Yep, Silica has always mentioned this. Magnesium can be transferred by the tree from the older leaves to the new ones that are more important, therefore a Mg deficiency shows up in the older leaves. Manganese cannot translocate to other areas, so a deficiency shows up on the new leaves. Silica explained it better, but that's the gist of it.

Just curious....Have you checked the pH of your mix and do you have to add some sort of product to acidify your soil to help your trees take up nutrients? I live in an area where the soil in natural nmore acidic than other areas of the country and yet my trees don't do well unless I use more acidic products like Miracid, Holly tone or Aluminim Sulfate....

I have been using Arizona's Best Citrus Food 3 times a year. I have been feeding my grapefruit tree (planted same time on opposite side of backyard ) and it looks great with big dark green leaves. I am no citrus expert so all suggestions are appreciated. Would Citrus Nutritional Spray help?

Ah, thanks for further explaining the magnesium deficiency symptoms. You might try applying a good helping of an organic compost fertilizer that should have a full array of micro nutrients. Alternatively, you might try a fruit and nut tree fertilizer which will also be fortified with a host of minerals.

Because you are in Phoenix, my tendency is to say not enough water... Any chance that this tree is planted next to / not too far away from existing landscaping with aggressive roots? ... or the roots just haven't found your neighbor's lawn yet? Those neighboring roots will grab the water from your citrus.

If the roots are too dry, they cannot take up the food you put down. Been there, done that.

BTW: my friends' trees in Scottsdale were ignored (against my cries... he didn't want to spend the effort to irrigate them) but, all found the neighbor's nice, lush green lawn. They were terrific producers until the neighbor put down a weed control lawn fertilizer.

cms9323 manganese leaf deficient symptoms are extremely common during the early Spring months. Unless the deficiency is great, most growers do nothing to correct it. As the weather warms, and the lealves mature, the sympomtoms normaly dissaperar. If in the event that the smptoms persist you can simply spray the foliage with a manganese sulfate solution of 1 gram per quart. However if you spray, which I doubt will be required, be sure to also spray for zinc at the same time, by dissolbing 1 gram manganese sulfate and 1.5 grams zinc sulfate in a quart of water, and as always be sure to add a sufactant. Mikerno_micha1 your correct that pH can cause many problems indeed. However, in the case of Manganese cms9323's tree is more that likely not bothered by pH, as Manganese is available to the tree any where from a pH of 4 to 8 or even a little higher.

O J. Thanks for that bit of info..It's the first time I heard of that. Much appreciated..

Mike

Navel oranges can be alternate bearing, heavy one year and light the next. It does look like you have several fruits developing now.