ash898: Can you upload a photo so that we can see the plant? Yellowing leaves can mean too much water; does the container have drainage holes in the bottom? If it's growing in Sphagnum Moss only with improper drainage, the moss could be staying too wet. The white stuff on the undersides of the leaves could be mealybugs and soapy water should take care of them but might not get any remaining eggs that haven't yet hatched. I use Isopropyl Alcohol for mealies which works really well and if there aren't many of them you can q-tips, dip them in the alcohol and wipe the mealy bugs. I'd recommend removing the plant from it's pot and completely rinse all moss or soil from the roots and re-pot in a well draining potting medium.
I agree with dyzzypyxxy, Alocasia's go dormant when the temp's are cool. I'm on the east coast of Florida, way NE of your area and my one or two Alocasia are dormant now but will pop up again when we have continuous warmth.
I've never fertilized mine, maybe Elaine can share what type of fertilizer should be used for these beauties.
Oh, and by the way Welcome to ATP, you'll love it here!
