Brown spot on Philodendron Pink Princess
My Philodendron Pink Princess has a spot on it that started a couple of weeks ago. First, the Pink started fading, then then spot started as a yellowing patch. Now, it's progressed to brown. I'm wondering if it's:
1. Sunburn - due to trying to find it a spot with burgh light and no direct sun
2. Lack of humidity - it was by a humidifier at first, but not when I started looking for a spot with suitable light
3. The fallout from a mealy bug infestation that I'm currently annihilating
4. Watering stress? - it's still in it's nursery pot in a well draining mix. I water when the top two inches are dry.
I've had the plant for about six weeks, and it's given me towo new leaves during that time.
I welcome any thoughts, as I can't just run out to the garden center and pick up another one of these babies