My lemon tree today. Doing significantly better, sprayed w/water and the w/soapy water - all the 'black spots' disappeared - thus it seems like it was in fact 'spider mites' as per Tony's links - though, it seems they attack only if the plant is stressed, thusly - I will also be following up with Moreless advise on reconstituting the tree. ML: Can you verify after seeng pics from today?