Leaves dropping on citrus tree
I was given a dwarf citrus in May [orange] and potted it as directed 2 gallon pot 10 inches across at top]and only give it a qt of water every two weeks. Every other time been using fertilizer in the water[same as I use on my orchids]. All went fine this summer but I brought it inside two weeks ago and it is shedding leaves daily. Right before I brought it in I washed it well in dish detergent water mixture as I do all my plants before bringing them inside. Has lost over half of them already. I also noticed small brown scales as well as little white dots on it. Mites? I have sprayed with a permethrin plant spray. Is it too late? Have I killed it?
Thanks for the help. I have never had a citrus tree before and this was a Mother's day gift. I have it in a south facing window. Room temp is around 70 degrees F