Wall behind refrigerator

I pulled the refrigerator out from the wall because I noticed something on the baseboard between the cabinet and refrigerator I had not seen before. The wall was falling apart behind the refrigerator. This is actually how it is when the apt. is rented out!!! The mold is creeping along the baseboard but has also grown on the hose leading to the back of the refrigerator and is destroying it too.

Done