Senevirathne, L.P.S.S.G.; Jayasinghe-Mudalige, U.K.; Guruge, T.P.S.R.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Galagoda, R.P.W.M.R.R.K.B.; Gajanayake, K.G.M.C.P.B.; Silva, D.A.C.S.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)