While tank mixing Cool Power Selective Herbicide with Prodiamine 65 WDG would likely be compatible, you should bear in mind that pre-emergents must be irrigated in after applying in order for the active ingredient to penetrate down into the soil to create a barrier in the soil to prevent weed seed germination, whereas a post-emergent would not be irrigated after applying.  Anytime you plan to tank mix various pesticides you should refer to all product labels, adhering to the most restrictive labeling instructions, and mix a small jar test first to confirm compatibility.

Answer last updated on: 02/12/2026