Phil from Mesa, Az writes
Princep Liquid Herbicide and Ranger Pro have different modes of action. Pre-emergents should be applied prior to weed germination and post-emergent herbicides should be applied when weeds are young and actively growing. If you plan on mixing other chemicals with Princep, then you will need to do a compatibility test and then calibrate your mixture according to the section "Mixing Procedures" on page 8 of the product label.
Answer last updated on: 02/24/2021
