Phalaenopsis with brown spots under leaves leading to yellowing and leaf death
Hi all! Can anyone help me identify what’s going on with my phals? On a number of my plants, the undersides of the leaves develop mottled brown spots, then the leaves turn yellow and fall off. The roots are in great condition. This is only happening to my phals, none of my other orchids are affected. I’ve treated with physan20, but am not seeing any improvement. Thanks for any help!