Avid 0.15 EC and Forbid 4F have not been tested to be mixed with adjuvants or surfactants, such as Prime Source Duo Stick. Per each products’ label, if you would like to add an adjuvant or surfactant, it is recommended that a small area be sprayed first to make certain that no phytotoxicity occurs. An MSO surfactant such as Duo Stick is used generally only with herbicides since it is designed to help cut through the waxy coating on plants, so if you were to add a surfactant, be sure it is one that is for use with insecticides/miticides and not just herbicides.
Avid 0.15 EC Product Label
https://www.domyown.com/msds/Avid_0.15_EC_Label_.pdf
Forbid 4F Product Label
Yes, Prime Source Duo Stick can safely be applied to Bermuda turf. It is not labeled for specific weeds because it is not a herbicide. The Duo Stick Select is specially formulated for use with herbicides and other pesticides that require MSO or MVO. The oil serves as a major penetrant that supports particular pesticides in shifting through the waxy cuticle of leaves and plants for optimal efficiency.
