Its a little hard to see clearly exactly what the small white insects are. We suspect either whiteflies or cottony cushion scale. If the insects fly when disturbed, they are whiteflies. If the are soft and mushy and more congregated on the stems, its probably cottony cushion scale. This website will help you id the pest and give you control measures: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7410.html. Or, you could send a clearer close-up and we should be able to tell for sure. Also let us know if there is black sooty mold on the leaves. Beyond that, this tree looks like it is suffering from various nutrient deficiencies. Normally, we wouldn’t recommend fertilizing now because it could make the tree more frost sensitive. However, this shouldn’t be a problem where you live, so begin feeding the tree monthly with a liquid citrus fertilizer that includes nitrogen and chelated micronutrients iron, zinc and manganese. Your local nursery can recommend the right fertilizer. Follow the label instructions. Come January or February, you could switch to a dry citrus fertilizer which would be easier to apply. Also make sure the tree is not getting overwatered. This time of year, a deep watering every 10 days to 2 weeks should be plenty.
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