At this point, leave it alone, don't over water it, be patient, and pray. It will probably recover.

My goodness, what did you spray?
Definitely give it a chance, and go easy on the water until it starts regrowing.

When my plants have problems, I also like to slide them out fo the pot (if possible) just to make sure the roots look healty and the corm has not turned mushy, either.

s.

I used Malathion, evidently too much, or just not safe on Bananas. I will try the dishwashing soap next time. :-) I hope it survives.

I wonder if it would be better to cut it back to soil level? It was only about 18 inches tall.

Don't give up. My indoor bloodleaf died over the winter as I guess I went too dry. Lost about 2 of the 3 feet that it was tall. The attached pup survived so I chalked it up to experience. A few weeks ago as the nanners all started taking off low and behold the cut stalk sprouted a new leaf. I thought it was gone for nearly 3 months. Definitely make sure the corm is not mush and just cross your fingers. I have heard many recovery stories of such luck.