Russell, J.2015-06-192015-06-191952Tea Quarterly23(2)pp.27-40https://dl-tri.nsf.gov.lk/handle/1/945AgriculturePhysiological methodsCultural methodsDisease controlPest controlResistant varietiesPlant protectionBiological controlChemical controlInsect controlSoil insecticideHerbicidesGrowth promotersWastage of world food supplies through diseases and pestsArticle