But it's also the active ingredient in Preen's Crabgrass Control product. Dithiopyr works by inhibiting the growth of root cells, making it impossible for germinated seeds to grow. It also works ...

That timing is between late March and mid-April. There are several products available on the market for crabgrass control. The most widely used products are Barricade, prodiamine, and Dimension ...

In Delaware, crabgrass usually germinates between March 15 and April 15. Depending on the product, time of application, location and rainfall in the spring, reapplication may be necessary within 60 ...

An example of a pre-emerge product is Prowl H2O. This herbicide is used to control Crabgrass in Bermudagrass hayfields. Post-emerge products are used to kill weeds after they have germinated.