Russell, J.2014-11-182014-11-181952Tea Quarterly23(2)pp.27-40https://dl.nsf.gov.lk/handle/1/13434AgriculturePhysiological methodsCultural methodsDisease controlPest controlResistant varietiesPlant protectionBiological controlChemical controlInsect controlSoil insecticideHerbicidesGrowth promotersWastage of world food supplies through diseases and pestsA