What I used to do for situations like this was to cut out a small peice of a black plastic, like from a thick garbage bag and about the same size as the infected area. Then put that over the thing, tucking it in where I could and the a couple peices of rubble to hold it down. This way you block light and water flow and thus any food source.
It also works well on teenagers, but you need to use duck tape!! lol
mojo
It also works well on teenagers, but you need to use duck tape!! lol
mojo