Studi Patogenisitas Phytophthora nicotianae V Bdh dan Pengendaliannya dengan Trichoderma koningii Oudem pada Beberapa Varietas Tembakau Deli

Abstract

Phytophthora nicotianae is one of primary disease at tobacco areas. It influences the capital income because tobacco is one of the important export commodities. P. nicotianae \s a soil born pathogen that can stay life long in the soil. So it is diffrcult to control. The objective of this research was to know the resistance level of some Deli tobacco variety to P. nicotiareae. Secondlyto know the potential of L fuiningii and the secondary metabolite in conholling P. nicotianae on some tobacco variety. This research was done at Balai Penelitian Tembakau Deli (BPTD) PTPN II, from December 2008 to May 2009. It consisted of five activities, i.e. (l) pathogentest on P. nicotianae in some tobacco variety, (2) T. koningii antifungal suspension test towards P. nicotianae in some tobacco variety, (3) T. koningii conidial antagonistic activity test towards P. nicotianae in some tobacco variety, g) f. koningii antifungal suspension resistant induction towards P. nicotianae in some tobacco variety, (5) T. koningii conidial resistant induction towards P. nicotianae in some tobacco variety. Furthermore, Deli-4, Fl 45, NC 95 and FIN were varieties used in this research. The results of the analysis showed that NC 95 was the most resistence variety of the four, but Deli-4 was the most susceptible. The conidia and secondary metabolite of T. kaningii were able to control of P. nicotianae. lts secondary metabolite more effective rather than its conidia both in treatment and pre inoculation