Just a little background on my tree:

I've had it for less than a year; I got it back in September from a nursery. It was doing fine for a few months and had many flower buds on it. Within the last month or two, it started to look really sickly. On closer inspection, I noticed it had a spider mite problem. After doing some browsing and searching online, I went to the store and bought some Insecticidal Soap. I had read on other sites and forums to treat it approximately every 7-9 days for a few weeks to kill the adult spider mites and also subsequent adults that were hanging out as larvae.

I've done that for 3 weeks now, and I haven't seen any signs of spider mites. However, my tree still doesn't look great. I also read that spider mites don't like air circulation, so from time to time I'll turn on a fan from a distance to get some air circulation in the room.

I water my plant every 7-9 days, and this last week I put some fertilizer that was high in nitrogen. Was it too soon to fertilize it since it's been stressed by spider mites?

It sits by a south-facing window and gets plenty of sunlight (but I try not to let it have too much direct sun)

The leaves continue to turn yellow and fall off. I can't tell that the leaves fall off in any sort of order (ie, older vs. newer leaves).

What am I doing wrong? Please help! I don't want it to die. :(

Here are some links to photos of some of the leaves and the tree:

Emily, first and utmost, where do you live? When can you put your tree outdoors?

That tree is small enough to wipe every leaf off with warm milk and water often.

If it can't be oudoors for a while, I would watch your watering closly as John says. I must say it looks like it is in a great mix. Is that the 5.1.1 mix many here use? Mostly bark? Very porous?

That was a great catch on your part, finding the mites. Most would not be aware of this factor so my hats off to you for controlling it.

I would make sure it gets lots of sunlight at this point. even if it should drop all the leaves, at least the roots will stay strong and still push new growth accustomed to new light levels.
I have many times actually plucked every leaf off just to have the tree come back bushier than ever. They are more resilient than one might think.
I would of held back on fertilizing after an attack as so, because you don't want to encourage new growth in your warm , dry conditions unless you can figure a way to discourage mites from coming back to eat the fresh foiliage about to grow with 'constant' air movement aimed to blow towards under the leaves. Never shut your fan off and see if you can use a small table one with low speed.

If I have had a mite infestation,I would actually snip of all the new growth until I can almost put them outside to be on the safe side from stragglers then treat and treat all summer so I don't bring them in the following fall.

I always make sure the environment for mines are just right to reduce mites infestation possibilities.

For instance.

>If they are indoors, in my house, in a sunny window, I like to keep the room very cool with fans and moisture in which mites or any pests detest.
>For those in the greenhouse, I fertilize regularly for new 'strong' growth along with moist air, and air that is constanly being moved my fans.
I am not worried about spindly growth in this case or tender desirable leaves because they are getting all day sun and grow tougher.
In there, I deliberately let temps drop to the 50's at night though again which mites despise.
>At work, where conditions are very dry, I constantly wipe the leaves off those with warm milk and water, and shower them once in a while to keep the leaves clean.

Keeping your tree in a well draining mix, in a full sunny south facing window, leaves clean, fertilizing very lightly to discouarge fresh tender foliage until you are ceratin you have no mites, will help your tree make a full recovery in time for outdoors.

Please, don't fret if those leaves fall off, since many citrus shed leaves anyway for various reasons. As long as you are not loosing branches due to root issues caused by over or under watering or a poor soil mixture, it will come back strong once it sees the great outdoors if not sooner:-)

Mike