De Silva, J.A.Y.P.; Gajanayake, B.; Priyadarshana, L.B.M.D.L.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Adikari, A.M.N.; Dissanayake, D.M.P.D.; Herath, H.M.I.K.; Wijebandara, D.M.D.I.; Gajanayake, B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)