As we look ahead to spring, we can’t help but start strategizing for crabgrass control. There are many factors to consider when thinking about pre-emergent herbicide applications on sports fields. To help address these various factors, here are some answers to common questions.

How do crabgrass pre-emergent herbicides work?

After application, these herbicides form a barrier to inhibit the emergence of crabgrass seedlings. It’s important to apply the product once average daily soil temperatures are between 57°F and 64°F. Depending on your climate, this could be April or earlier. It’s also important to apply the herbicide at a depth of one inch.

What are the best product options?

We have a variety of impregnated fertilizer options that contain herbicides like Dimension and Prodiamine. You can choose between liquid and granular to meet your needs. With impregnated fertilizers, you can also choose a product based on nutrient needs.

What about post-emergent crabgrass control?

Dithiopyr (Dimension) can be used as a post-emergent as well, controlling crabgrass through the three-leaf stage. For post-emergent use, Dimension is best applied as a liquid. If the field you’re treating was dormant seeded, apply Dimension after turfgrass germination to control young crabgrass and create a barrier for the crabgrass yet to germinate. 

Aside from herbicides, how can I reduce crabgrass pressure?

  • Maintain a dense, healthy turf stand
  • Irrigate deeply and infrequently
  • Apply the majority of your nitrogen between September and November
  • Water in pre-emergent products when possible