Bill, You are going to have to post photos if you want reliable answers. "Rusty brown leaf edges" is a hard place to start to diagnose your problem. If you are using a good formulated citrus fertilizer, I would not be adding iron on a regular basis... unless the plant showed obvious iron deficiency. In high doses Iron is toxic to citrus; in lesser doses it can cause an imbalance that impedes the absorption of other minerals.

I agree with Millet. I have those spots similar to yours from time to time but I thought those were caused by some insects nibbled at the leaf and it flew afterwards. Unless there are many leaves that are like that, if I were you I won't worry about it. I always thought that there will be new leaves, new growth that will replace them. Sometimes I snip them for good looks and you know what? The plant is forced to grow new buds to replace them.

I agree with John. We had some very wicked hot weather this last week. Most likely sunburn. With your Spinosad, did you add any oil, like Neem or Volk? If so, you want to make sure not to spray with any oil if temps exceed 85 degrees, or you'll fry leaves/fruit. Patty S.

Josh, no determination has been made as to Birdman's pH of his water. Just that it is municipal water. And he doesn't need to test it, just contact his municipal water district for the pH value. If his water is 7.2 or below, no need to add any vinegar. I consistently water all my container citrus with my municipal water out of a hose which is about 8.0 (acceptable range is 7.8 to 8.5 for my WD) with zero issues in micro uptake (see photos above). I pot my plants in EB Stone Cactus Mix, which I believe is on the acidic side with Fir Bark, Lava Rock, Canadian Sphagnum Peat Moss, Sand, Redwood Compost and Mushroom Compost, and eventually, I'll have to re-pot, if the soil starts to degrade and compact, or the trees get too big for their current pots, so that will start the cycle all over again, as far as total soil pH goes for me. If you feel better about acidifying your water, you can do that, but citrus are remarkably adaptable plants. I think we are probably more guilty of "over love" sometimes, with container citrus. From what I see with Birdman's tree and fruit, I am still concerned that he is dealing with Phytophthora. He needs to contact his extension agent and get a definitive diagnosis. If it is Phytophthora, he really should consider replacing the potting soil (despite this perhaps not being the best time to re-pot, it now becomes essential to remove the organism from the soil and exposure to the roots), and then treat the canopy as well, with Agri-Fos, which actually travels down to the roots, and continues to protect the roots from any leftover Phytophthora. We're sort of swerving away from Birdman's original concerns of his infected fruit, and overall poor condition of his little tree. All fruit really should be removed to help the tree survive, which I know is hard to do, but the tree is struggling to be healthy and putting all its energies into trying to produce fruit at the detriment of the tree's overall health and vigor. pH isn't the issue here, I don't think. Patty S.