yellow spots

Hello! First time posting here and I´m new to bonsai and currently loving it. I own a Sageretia theezans and it´s growing pretty well, but lately I have been spotting some weird leaves among the normal green ones (second pic is how it generally looks). They have these spots on them but are not...

Hi About a week or two ago I posted a thread regarding what I thought at the time was a form of fungal infection or pest on my Chinese elm, and a few kind people replied, with the majority of them deeming it to be a nutrient deficiency (mainly N). Initially this seemed like a reasonable...