PACE Turf - Turfgrass Information Center

Pre-emergent Herbicides for Control of Smooth Crabgrass

Summary: In a replicated field trial conducted on a hybrid Bermudagrass tee at La Jolla County Club, La Jolla, CA, residual activity, various formulations, rates and application timings for the herbicides Dimension, Barricade, Ronstar and Pendulum were evaluated for pre-emergent control of smooth crabgrass, Digitaria ischaemum. Key results included:

  • In warm winter climates such as California, it is possible that applications of pre-emerge herbicides for control of crabgrass can be made later than the manufacturers currently recommend (current recommendations are to treat when soil temperatures reach 50 - 55° F), thus extending the activity of these products into the summer months. This is based on our observation that soil temperatures at La Jolla CC reached 50 - 55° F on 3/3/97, but crabgrass seedlings didn't emerge until 5/5/97--a full two months later.
  • The best performance (100% control for 4 1/2 months) came from Dimension 1EC at either 1.5 oz/1000 (applied once on 3/3/97) or 0.75 oz/1000 (applied twice on 3/3/97 and 5/5/97), Pendulum 60 DG, at 1.8 oz/1000 (applied once on 3/3/97), a single application of Barricade 65 WG, applied at 0.55 oz/1000, and split applications of Barricade 65 WG (applied 3/3/97 and 5/5/97) at either 0.28 oz/1000 followed by 0.28 oz/1000, or 0.37 oz, followed by 0.18 oz/1000.
  • Lower rates of Barricade did not perform as well as either the high rate of Barricade or the split applications of Barricade, and the granular formulation of Dimension did not perform as well as the Dimension 1EC formulation.
  • For reasons that are not clear, the performance of Ronstar 2G was equivalent to that of the non-treated control throughout the trial.
  • The most effective products had a residual activity of 140 days (4 1/2 months).

Full print version of report

Investigators: Wendy Gelernter, Ph.D. and Larry J. Stowell, Ph.D., CPPP, CPAg

Cooperator: Bruce Duenow, La Jolla Country Club

Sponsors: Dennis Shepard, Novartis; Randy Smith, Rohm and Haas

Evaluation of Insecticides for Control of Black Turfgrass Ataenius Grubs

Summary: In a replicated field trial at Los Coyotes Country Club, Buena Park, CA, the insecticides halofenozide, imidacloprid and acephate were tested for control of black turfgrass ataenius grubs. Treatments performing better than the non-treated control included the high rate of Mach 2 G (69.6 oz/1000 square feet), the mid-rate of Mach 2 SC (2.2 oz/1000 square feet) and Merit 75 WSP (0.15 oz/1000 square feet). The highly clumped nature of ataenius infestations, and the relatively low population levels made separation of other treatment effects impossible. However, trends (non-significant) indicate that Pinpoint 15 G (acephate) and the 3.0 oz rate of Mach 2 SC also performed quite well.

A strong rate response for Mach 2 G was observed. Surprisingly, there was only a weak rate response for Mach 2 SC. All products showed some level of curative activity on grub populations that were present at the time of application. In addition, residual activity of up to two months was observed for Mach 2 SC (2.2 oz rate) and Mach 2 G (69.6 oz rate).

Full print version of report (124Kb)

Investigators: Wendy Gelernter, Ph.D. and Larry J. Stowell, Ph.D., CPPP, CPAg

Cooperators:Bill Gallegos, CGCS; Los Coyotes Country Club, Buena Park, CA

Sponsors:Darrin Allred, American Cyanamid; Bernard Olsen, Plant Sciences, Inc

Super Journal Mission

Super Journal Mission: The Super Journal is an on–line turfgrass research publication provided as a public service by PACE Turf. It's mission is to share practical research conducted by turfgrass managers at their sites, turfgrass researchers and students. All published materials are reviewed by Larry Stowell, Ph.D. and Wendy Gelernter, Ph.D. prior to publication.

Please refer to the Super Journal submission guidelines if you wish to have your report published in Super Journal, and our research guide for information on designing and implementing your own turf research project. Please contact us with any further questions or feedback. We look forward to your participation!

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