Products like Scotts Turf Builder with Halts are pre-emergent herbicides that prevent crabgrass from growing. They should be applied to a dry lawn and then watered for maximum effectiveness, according to turf grass scientists at the University of Illinois and Purdue University.
About this Author
D.M. Cameron was a journalist and editor for wire services, newspapers and magazines for more than 20 years. In addition to editing and ghost-writing non-fiction books, Cameron now writes for several websites and trade journals. Cameron's degrees include a Bachelor of Arts in journalism from Penn State.