>I have two Yucca plants and a Diefenbakia that is spreading very sticky
>sap on the floor underneath it. It is attracting ants and my husband is
>threatening to throw them out. I have seen certain leaves on the yucca
>plant with sticky yellow spots on them which I cut off as soon as I see
>them. The dief. is sticky on its leaves all the time.
Plants don't usually just dribble sap. I suspect you have a problem with
aphids or scale insects and what you are getting is their sticky secretions.
Taking care of the insects should take care of the mess.