The pests of Sweet Potato (Ipomoea batatas) at Turrialba, Costa Rica, with special reference to polygrammodes elevata F. (Lep, Pyralidae) and its effect on yield King, A.B.S Insectos perjudiciales Camote Ipomoea batatas Plagas CATIE-SC (1754) Costa Rica CATIE 1978 1978 22 En