All of my funny comments have been deleted in order to format to the site's character limit. Bottom Line, Herbie Husker is backing dchall!

Annual bluegrass control (Herbie Husker or Lil’ Red)

University of Nebraska–Lincoln
Turfgrass Science Program | turf.unl.edu Pub. 2010c Pro Series

Table 1. Summary of practices to favor or culturally control
annual bluegrass.

Practice

To favor annual bluegrass

To control annual bluegrass

Mowing height

Lower the better

Higher the mowing height will favor the desired species

Irrigation

Shallow and frequent irrigation to keep the upper 1 inch
of the soil profile damp for the shallow rooted annual bluegrass.

Keep the area as dry as possible. Allowing dormancy of the
desired turf should thin or kill annual bluegrass.

Aerfication

Aerification in spring and/or fall to bring seedheads to
the surface and encourage germination

Aggressive aerification to minimize compaction. Primarily
done in the summer when annual bluegrass will not be germinating

Nitrogen

Spring and fall nitrogen, especially late fall when annual
bluegrass is still growing aggressively.

Primarily in summer. Aggressively growing annual bluegrass
in spring and fall will respond favorable to spring and fall N.

Phosphorus

Regular phosphorus increases availability to limited root
system of annual bluegrass and should aid in seed production.

Low phosphorus fertilization in theory reduces seed head
production.

Seed head management

The growth regulators Embark, Proxy or Ethephon are most
effective seedhead limiters. Limiting seedheads will conserve carbohydrates
for better summer and potentially winter survival. These will also eventually
limit seed stores in the soil.

Constant mowing with clippings caught during seedhead
production will help long- term to limit supply in soil. Gaussoin and Branham
(1988) reported that removing clippings can reduce annual bluegrass
populations up to 20% over three years.

Fungicides

Regular fungicides targeted for summer patch and
anthracnose in addition to the typical dollar spot, brown patch, and pythium
controls.

Avoid any fungicides that will control summer patch or
anthracnose when treating for dollar spot, brown patch, or pythium controls
in the desired turf.

Preemergence herbicides

Apply at typical timing to control crabgrass and
concentration in soil should allow annual bluegrass germination near Labor
Day.

Labor Day applications will minimize annual bluegrass
germination in fall, and likely will require a second application again in
late fall or very early next spring

Postemergence herbicides

Velocity and Prograss are effective on mature annual
bluegrass. Certainty and a number of others will control young annual
bluegrass. Some will try low rates of glyphosate. Tenacity and Arysta’s
amicarbazone are still being evaluated for cool-season turf.

Growth regulators

Trinexpac (Primo, T-Nex) will help improve stress
tolerance and help to make annual bluegrass heathier.

Paclobutrazol (Trimmit, TGR) or flurprimidol (Cutless,
Legacy) will limit growth of annual bluegrass allowing desired turf to out
compete annual bluegrass