@WillC
Dear Mr. Creed -
I need some help with my 3rd gen (propagated) Monstera, fondly known as Planty Junior Jr. I've got him in a west facing window in my office and he did get some direct sun, but with the window closed. The first three leaves from the bottom on the stem are showing tiny yellow spots, with the lowest leaf (Leaf1 in the pix) the worst and showing some tiny brown spots as well, the 2nd leaf (Leaf2) not as bad but trending that way, and finally the 3rd leaf up from the bottom (Leaf3) just showing the same symptoms. So far nothing on the fourth leaf. I'm careful not to overwater or underwater, and have given him a bit of Miracle-Gro, plus a little pelletized Mg and Ca like what you'd sprinkle under hydrangeas. Overall he seems healthy enough, with the upper leaves splitting like they should and air-roots appearing quite a lot (I trim the off every couple months or so). he just put out a new leaf a month ago, and it has already split and is a beautiful glossy deep green.
Any ideas on what could be causing the tiny yellow spots on the lower leaves? They never appeared until I moved him here from home, where he also sat in a window, tho not as bright. He's been in the same pot for several years, and could probably use a bit more soil or even a repotting, but I am concerned about the spotting. Any ideas? A poster in another forum suggested either red spider mites or a fungus of some kind. There are zero indicators of mites - no cobwebs, no little critters on the plant anywhere. But a fungus? Seems odd that it would develop one here in my office where it is the only plant around.
I'm attaching a few photos to illustrate.
