Or try an evolutionary approach. Artificially enforce some dependency between an organisms' (fungi, bacteria) ability to kill a wide spectrum of targets, and th

Or try an evolutionary approach. Artificially enforce some dependency between an organisms' (fungi, bacteria) ability to kill a wide spectrum of targets, and their own continued survival. Let the organism spread on a large matrix in close contact with the targets and zap the areas where the targets are thriving; repeat until you have evolved strains that are effective in destroying the targets. Wonder if it's possible or even been tried.