sometimes animals can eat fruits from the tree of a farm of hard working farmer who has taken all efforts for the tree to grow... sometimes it does get infected with insects even if a farmer takes all care...and if farmer is being forced to ignore the problem as its insects right to eat readymade farm products or a virus/bacteria to suck blood then very little can be done... farmer can just try to get some fruits out of his loved tree and have good memories..as he knows the tree is going to die one day..along with that parasites/bacteria/viruses will automatically die as when they had chance they just wasted time eating free fruits and turned a blind eye on what was obvious reason for tree to die slowly
