Sihombing, Nova YantiAli, MuhammadPuspita, Fifi2013-04-172013-04-172013-04-17Arnalishttp://repository.unri.ac.id:80/handle/123456789/2900Nove Yanti Sihombing. Jur.2013knot disease caused by Meloidogyne spp. is one of important diseases on tomato plants. One of the alternative control is using leaf powder is nematisidal. The research has been conducted to study the effect of leaf powder plants as botanical nematiside on root knot disease caused by Meloidogyne spp. on tomato. The research was conducted at the Experimental Farm Technical Implementation Unit (UPT) and Laboratory of Plant Diseases Faculty of Agriculture University of Riau from April to September 2012. The treatments tested were: non-leaf powder (NO) leaf powder Tagetes patula (N1) Tagetes erecta leaf powder (N2); Azadiractha indica leaf powder (N3) and Chromolaena odorata leaf powder (N4). The data is analyzed by using the Analysis of Variance (ANOVA) and Duncan’s New Multiple Range Test (DNMRT) at level 5%.. The results showed that leaf powder gave some plants such as Tagetes patula, Tagetes erecta, Azadiractha indica and Chromolaena odorata could radious root disease caused by Meloidogyne spp. compared to the non-leaf powder of leaf powder. Azadirachta indica leaf powder provided better result in controling nematodes Meloidogyne spp. with disease intensity scale of 0.75 and the average population of the nematodes Meloidogyne spp. is 0.othertomatoleaf powderMeloidogyne sppstudent Paper Post Degree