Hi there, I have a newish lemon tree that has lots of fruit (seemingly growing well) but the new growth is partly yellow and leaves curled. I'm concered the tree might have mites (but I'm not sure). I did see an actual spider on it (but it was clearly visable and just a tiny spider). I also included a photo of one mature leaf which is a bit dirty looking (and I was able to remove some dust). Any advice? Its in a warm location with lots of light (its potted) and its not overwatered.