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The Efficacy of Herbicides in Controlling Mayaca fluviatilis: An Invasive Aquatic in Sri Lanka

Author Affiliations

  • 1Postgraduate Institute of Science, University of Peradeniya, Sri Lanka
  • 2Dept. of Horticulture and Landscape Gardening, Faculty of Agriculture and Plantation Mgt., Wayamba University of Sri Lanka, Sri Lanka
  • 3Department of Botany, Faculty of Science, University of Peradeniya, Sri Lanka
  • 4Department of Agribusiness Management, Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Sri Lanka

Int. Res. J. Biological Sci., Volume 5, Issue (9), Pages 41-44, September,10 (2016)

Abstract

The present study describes an attempt to investigate the efficacy of herbicides available in the market and its concentration to control Mayaca fluviatillis, a potential invasive aquatic plant in Sri Lanka. The experiment included 11 different treatments; five different herbicides/ herbicide mixtures sprayed on plants, each at two different concentrations and a control. A significant (P < 0.001) colour change, which resembles complete mortality, was observed 8 weeks after treatment with the herbicide Solid Pretilachlor at high dose (2.5 ml/L). Root dry weight and efficacy rate of the herbicide (100 %) also supports this observation. As other herbicides does not report 100% efficacy, Solid Pretilachlor at 2.5 ml/L could be recommended as an alternative method to mechanical control of M. fluviatillis with minimum environment impact as the plant is currently spread only in water bodies which are small in size and are not interconnected.

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