| Yes, I have seen mealy bugs kill off a leaf on a phal seemingly overnight too. I have not examined them closely, but have read that they can be under the media sucking at the roots too (?). I recently had mealies on a phal and had a similar experience, except that believe it or not they sucked the life out of a leaf in the middle of other leaves - leaving it yellow/brown in just a couple days. A systemic may be warranted - such as Bayer Rose and Flower spray. You have to stay with the program too - just when you think you have the problem licked they will spring up again. I think you are onto the problem - just have to stick with it with vigilence. |