Get access

Herbicidal activity of formulated sorgoleone, a natural product of sorghum root exudate

Authors

  • Md Romij Uddin,

    1. Department of Crop Science, College of Agriculture & Life Sciences, Chungnam National University, Yuseong-gu, Daejeon, Korea
    Search for more papers by this author
  • Sang Un Park,

    1. Department of Crop Science, College of Agriculture & Life Sciences, Chungnam National University, Yuseong-gu, Daejeon, Korea
    Search for more papers by this author
  • Franck E Dayan,

    1. USDA-ARS Natural Products Utilization Research Unit, University of Mississippi, MS, USA
    Search for more papers by this author
  • Jong Yeong Pyon

    Corresponding author
    1. ReSEAT Program, Korea Institute of Science and Technology Information, Yuseong-gu, Daejeon, Korea
    • Correspondence to: Jong Yeong Pyon, ReSEAT Program, Korea Institute of Science and Technology Information, 335 Gwahangno, Yuseong-gu, Daejeon 305-806, Korea, E-mail: jypyon@cnu.ac.kr

    Search for more papers by this author

Abstract

Background

The allelochemical sorgoleone, a major component of the hydrophobic root exudates of Sorghum bicolor, was formulated as a wettable powder [4.6 WP] and evaluated as a natural herbicide on several weed and crop species under different growth conditions.

Results

Formulated sorgoleone [4.6 WP] suppressed germination and shoot growth of weeds, with broadleaf species showing greater susceptibility than grass weed species. Germination and growth of broadleaf weed species were completely suppressed (100%) at 0.2 g a.i. L−1 sorgoleone in a growth chamber study. Post-emergence applications of the wettable formulation of sorgoleone [4.6 WP] inhibited 20–25% higher growth of weeds than pre-emergence applications under greenhouse conditions. Broadleaf weeds were more susceptible than grass species to both methods of application. In all studies, growth was suppressed in more than 90% of the broadleaf weeds and two species, in particular, Rumex japonicus and Plantago asiatica, were completely suppressed at 0.4 kg a.i. ha−1 sorgoleone. The crop species, on the other hand, were much more tolerant to sorgoleone, with 30% inhibition, at most, at the highest rate of 0.4 kg a.i. ha−1 sorgoleone.

Conclusion

The results of this study reveal that sorgoleone, after formulation as a WP, is more effective in inhibiting weed growth, and crop species are tolerant to it. The strong weed suppressive ability of formulated sorgoleone therefore offers interesting possibilities as an effective natural environment-friendly approach for weed management. © 2013 Society of Chemical Industry

Ancillary