Question
Hi, I recently repotted a cactus plant and it has been slowly dying and i have noticed the soil has white on it, I do know that this is some sort of fungus but do not know how to treat it. Is there a home remedy solution i can make??

Answer
Hi Teri, Fungus grows on decomposing organic mattter.  It may have nothing to do with your cactus dying.  I suspect it's more related to soil drainage and type.  I'd bare root the cactus again and pot it in a very coarse cactus mix.  Clean the pots with bleach before reuse.  Do not water it for a week after repotting.  We want to let the damaged roots callous over.  Then water very sparingly.  
If fungus returns, go to a garden center and get an appropriate fungicide.  I can not recommend a 'homemade' remedy.
Jim