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DISSIPATION AND EFFICACY OF PENDIMENTHALIN, PRODIAMINE, DITHIOPYR AND BENSULIDE AS AFFECTED BY DOSE AND APPLICATION TIMING FOR CRABGRASS (DIGITARIA SP) CONTROL IN A TURFGRASS ENVIRONMENT

Acuna, Alejandra A.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1242841967

Abstract Details

2009, Doctor of Philosophy, Ohio State University, Horticulture and Crop Science.
The dissipation of herbicides in a turfgrass environment is important to determine potential water and soil contamination and verify the actual herbicide concentration in the soil to assure long term weed control. Knowledge of herbicide dissipation and the effect of dose and application timing on weed control would help turf managers to better understand herbicide dynamics, and as a result schedule their herbicide application to improve weed control in the turf environment. Pendimethalin ( N-(1-ethylpropyl)-2,6-dinitro-3,4-xylidine), Prodiamine (1,3-Benzenediamine, 2,6-dinitro-N1,N1- dipropyl-4-(trifluoromethyl)), Bensulide [S-(O,O-diisopropyl phosphorodithioate) ester of N-(2-mercapto) benzenesulfonamide] and Dithiopyr [S,S-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioate] were applied to a Kentucky bluegrass turf at 2288 ga.iha-1,737.08 g a.i. ha-1,11339.75 g a.i ha-1 and 421.88 g a.i ha-1,respectively,either once, twice (applications were separated 30 days) or using half of the cited doses twice (separated 30 days). All herbicides and doses were applied in autumn 2007 and again in spring 2008. The design of the experiment was completely randomized with three replicates per treatment. The whole experimental area was seeded with crabgrass (Digitaria sp) at 1.2 kg ha-1 before herbicide application. Soil temperature and moisture were measured during the experiment. Soil samples were taken from each individual plot: 0, 4, 8, 16, 32, 36, 40, 48, 64 and 128 days after initial treatment (DAT). Each soil sample was divided in three sections: verdure-thatch, 0 to 5 cm and 5 to 10 cm. Herbicide was extracted from each section and quantified using a gas chromatograph with a NPD detector, using benfluralin (N-butyl-N-ethyl-2, 6-dinitro-4-(trifluoromethyl) aniline) as the internal standard. Herbicide efficacy was measured every 15 days counting number of crabgrass plants per square meter starting on May 1, 2008 until September 30, 2008. More herbicide was detected in the verdure and thatch layer. The amount of herbicide detected in the soil at 32 DAT date of the second application, was not double of the dose applied. Herbicide dissipation was quicker in spring than in autumn, mainly due to differences in soil temperature and moisture. In Autumn, more herbicide was detected at the end of the study (128 DAT) compared to Spring. Differences in herbicide efficacy were detected at the end of the season (September 30, 2008), dithiopyr provided better crabgrass control was offered by regardless of season of application. No statistical differences in crabgrass count were detected due to herbicide dose. However, 0 crabgrass plants per m2 were observed when full followed by full recommended dose was applied. These studies indicated the influence of soil temperature and moisture on herbicide rate of dissipation and the effect of the turfgrass environment in decreasing reported herbicides half lives.
David Gardner, Dr (Advisor)
Karl Danneberger, Dr (Committee Member)
John Street, Dr (Committee Member)
Edward McCoy, Dr (Committee Member)
James Metzger, Dr (Committee Member)
107 p.
Agronomy
turf; herbicide; dissipation

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Citations

  • Acuna, A. A. (2009). DISSIPATION AND EFFICACY OF PENDIMENTHALIN, PRODIAMINE, DITHIOPYR AND BENSULIDE AS AFFECTED BY DOSE AND APPLICATION TIMING FOR CRABGRASS (DIGITARIA SP) CONTROL IN A TURFGRASS ENVIRONMENT [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1242841967

    APA Style (7th edition)

  • Acuna, Alejandra. DISSIPATION AND EFFICACY OF PENDIMENTHALIN, PRODIAMINE, DITHIOPYR AND BENSULIDE AS AFFECTED BY DOSE AND APPLICATION TIMING FOR CRABGRASS (DIGITARIA SP) CONTROL IN A TURFGRASS ENVIRONMENT. 2009. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1242841967.

    MLA Style (8th edition)

  • Acuna, Alejandra. "DISSIPATION AND EFFICACY OF PENDIMENTHALIN, PRODIAMINE, DITHIOPYR AND BENSULIDE AS AFFECTED BY DOSE AND APPLICATION TIMING FOR CRABGRASS (DIGITARIA SP) CONTROL IN A TURFGRASS ENVIRONMENT." Doctoral dissertation, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1242841967

    Chicago Manual of Style (17th edition)

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