Weed Identification and Control

Bert McCarty, Turf and Weed Control Specialist

To download the 2014 Pest Control Guidelines for Weed Control, please click here.  (602 KB, PDF)

The best defense against weeds is a dense, vigorously growing turf.  By adapting the right grass to the site and following correct cultural management, including proper fertilization, mowing, and irrigation, weeds will not be able to compete as well as with the turf.  Before deciding to use any herbicide, diagnose first why the turf is thin and weeds are invading.  Correct the basic problem of unhealthy turf before using any herbicide.  HERBICIDES ARE NOT A SUBSTITUTE FOR  SOUND CULTURAL PRACTICES.

Deciding Which Herbicide to Use

Managing Herbicide Resistant Weeds

  • Herbicide resistant weeds in turf, such as Poa annua, spurges, goosegrass, and crabgrass are becoming more prevalent.  Fortunately, this can be contained if prudent action is taken.  The following table summarizes the main herbicides used in turf including their timing (Pre- vs Post-emergence), their mechanism of action within plant (how they control them), and various active ingredients.  Rotating between and tank-mixing herbicides with different mechanisms of action are keys to delaying or preventing herbicide reistant weeds from dominating a population.

    Table 14.  Managing Herbicie Resistant Weeds, Timing, Mechanism of Action, Active Ingredient (Trade Name Example).  (27 KB, PDF)

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Control of
Common Weeds

Weeds are indexed alphabetically. 
Select the section of interest.

A - E

F - J

K - O

P - T

U - Z