Rapiel, T.N.; Tennakoon, N.A.; Nugawela, A.; Fernandopulle, M.N.D(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Udayanganei, W.N.; Tennakoon, N.A.; Weerakkody, W.J.S.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)