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Tomatoes represent the host plant for the pathogen Phytophthora infestans. Together, as plant and pathogen, create a system named by A.R.ROBINSON pathosystem [1]. The plants are known as producers of many metabolites such us therpenes, alkaloids, flavonoides and amino acids. From this point of view naturally occurring substances present in different plants can represent a continuous resource of biological agents. Late blight of potato (Phytophthora infestans Mont. de Bary) is a serious threat to potato production ...