The application of herbicides (plant killers) can be as damaging as it is beneficial, depending on the method of application. The goal is to apply a properly mixed solution on the proper plant and to avoid damage to other plants. It is all about control of the product. Whether you are applying a synthetic or an all-natural, for us homeowners, the pump-up sprayer is the tool of choice. Products have been developed to replace the pump-up sprayer but none have passed the test of time. The hose-end sprayers are ok for fungicides and fertilizers but they are to susceptible to wind drift and non-targeted plants will be damaged or killed.
Here comes a tip for the most surgical applications of herbicides I know. After reading the directions, mix up your herbicide. Put on a new (no holes) dish washing glove. Put on a cotton glove over the dish glove. Dip your gloved hand in the mixed solution and wipe the offending plant. You can substitute a paint brush for the glove method. Yes, it will take longer before you’re completed but consider it quality time with the lawn.