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Using a selectivity index to evaluate logarithmic spraying in grass seed crops.

Tina Tind1, Tenna J Mathiesen, Jens E Jensen

  • 1Danish Agricultural Advisory Service, National Centre, Arhus N, Denmark.

Pest Management Science
|August 6, 2009
PubMed
Summary

Screening herbicides for grass seed crops using logarithmic spraying identified potential selective options. While some herbicides showed promise for controlling Poa pratensis in Festuca rubra L., selectivity indices did not consistently exceed the desired threshold.

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Area of Science:

  • Agronomy
  • Plant Science
  • Weed Science

Background:

  • Grass seed crops require selective herbicides for effective weed management.
  • Developing selective herbicides is challenging due to the crop and weed belonging to the same family.
  • Logarithmic spraying technology offers a potential solution for herbicide screening.

Purpose of the Study:

  • To assess the selectivity of various herbicides in grass seed crops.
  • To evaluate the efficacy of logarithmic spraying for herbicide screening.
  • To determine dose-response curves for herbicide selectivity.

Main Methods:

  • Six grass species were screened using logarithmic spraying with 11 herbicides.
  • Poa pratensis L. was used as the target weed species.

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  • A selectivity index was calculated based on crop damage and weed control doses.

    • Main Results:

    • Two ACCase herbicides (clodinafop-propargyl, fenoxaprop-P-ethyl) and a mixture of two ALS herbicides (mesosulfuron, iodosulfuron) showed potential for selective control of P. pratensis in Festuca rubra L.
    • Selectivity indices, however, did not consistently exceed the threshold of 2.0.
    • Logarithmic spraying allowed for rapid screening of herbicide compounds.

    Conclusions:

    • Logarithmic spraying is a valuable tool for rapidly identifying herbicides with favorable selectivity indices.
    • Careful experimental design is crucial to avoid confounding factors like growth rate and soil fertility.
    • Further research may be needed to optimize herbicide application for improved selectivity in grass seed crops.