Hello! I have 2 Calathea roseopictas. Both are suffering from brown spots with yellowing of the leaves, then leaf drop. One of the 2 has lost half it's leaves. The other still has most. I purchased them in Decemeber. I water them only when they are dry according to my water meter. I looked at the roots, they appear OK. I looked for pests and couldn't find any. Although when I pulled the
plant out of its container there was one little bug that resembled a fungus knat. I have researched the web and it ranges from fungus perhaps or under watering or gas furnaces which I do have and then there is that one little knat. I have a picture of the
plant but I see that I can't add it here. Any ideas?