Pre-Emergent Crabgrass Control for Sports Fields

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. The product must be applied once average daily soil temperatures are between 57°F and 64°F, which, depending on your climate, could be in 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. You can also choose a product based on nutrient needs with impregnated fertilizers.

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