I'm assuming that when you say microbes, you mean bacteria. What about using engineered fungi, which often already act as pesticides? i.e. https://www.ncbi.nlm.nih.gov/pubmed/28905488
From the pub you reference, it looks like some fungi can be beneficial. But many are not - many fungi cause wilts, rots, etc.
We only use naturally-occurring microbes, without genetic engineering. We focus on the unit of the cell, rather than the unit of the gene, to make our products.
We only use naturally-occurring microbes, without genetic engineering. We focus on the unit of the cell, rather than the unit of the gene, to make our products.