Abiotic Stress

Turf weeds in the heat

Be cautious with herbicide applications and high temperatures

07/27/2022

The projected weather outlook is predicting temperatures exceeding 90 F throughout Nebraska. Elevated temperatures slow cool season turf (Kentucky bluegrass and tall fescue) growth, especially when combined with low precipitation. Warm season grasses like zoysia and buffalograss increase growth potential during high temperatures. Summer annual grassy weeds like crabgrass, goosegrass and foxtail and the obstinate perennial weed, yellow nutsedge outgrow, and may sometimes dominate, cool season turfs during the summer months.

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Thermometer showing high temperatures

High temps are hard on cool-season grasses

07/06/2022

I just returned from a trip to the Pacific Northwest where it was a cool 70F. To get caught up on field research, I headed straight to the field where the heat index was 104F. I’ll share the mysteries and importance of temperature acclimation in a future article, but I was not adjusted to those temperatures. The heat and humidity are just as stressful to the turf we manage. The following was adapted from a Turf iNfo prepared by former UNL professor Zac Reicher.

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