Do you think you can kill an apple tree by "killing" the fruit on it? So, you damaged whatever was above ground. If it is a fungus, all you have done is damage the fruiting body, and have done nothing to the living part of the organism which is below ground.

Anyway, does it look like this, the so called dog's vomit slime mold? Fuligo septica - Wikipedia, the free encyclopedia
That will just go away in dry weather conditions.