International Science Community Association International Research Journal of Biological Sciences 2278 - 3202 5 9 2016 09 10 The Efficacy of Herbicides in Controlling Mayaca fluviatilis: An Invasive Aquatic in Sri Lanka 41 44 EN Subhadra Subhadarsini 1 P.G. Department of Botany, Utkal University, Vani vihar, Bhubaneswar, Odisha, India Sandeep Kumar Nayak 2 P.G. Department of Botany, Utkal University, Vani vihar, Bhubaneswar, Odisha, India Kunja Bihari Satapathy* 3 P.G. Department of Botany, Utkal University, Vani vihar, Bhubaneswar, Odisha, India M. Udayakumar 1 Department of Botany, Pachaiyappa’s College, Chennai – 600 030, Tamil Nadu, India T.* Sekar 2 Department of Botany, Pachaiyappa’s College, Chennai – 600 030, Tamil Nadu, India Analyn* Anzano Cabras* 1 College of Arts and Sciences, University of Mindanao, Davao City, Philippines Jürgen Wiesner 2 Dresdener Ring 11, D-38444 Wolfsburg, Germany Mohamed Ahmed Fadl 1 Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt and Biology Department, Faculty of Science, Taif University, Taif, KSA Hira Mubeenand Shahid Raza 1 Faculty of Biological Sciences, Department of Biotechnology, University of South Asia, Lahore, Pakistan Pramod Phirke 1 Department of Zoology, Fergusson College, Pune–4, MS, India S.P.* Zambare 2 Department of Zoology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, MS, India D. Chathurangani 1 Postgraduate Institute of Science, University of Peradeniya, Sri Lanka K.* Yakandawala 2 Dept. of Horticulture and Landscape Gardening, Faculty of Agriculture and Plantation Mgt., Wayamba University of Sri Lanka, Sri Lanka D. Yakandawala 3 Department of Botany, Faculty of Science, University of Peradeniya, Sri Lanka N. R. Abeynayake 4 Department of Agribusiness Management, Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Sri Lanka > Short Communication 2016 8 30 2016 09 10 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. Copyright@ International Science Community Association