Aktivitas Ekstrak Daun Jarak Kepyar (Ricinus communis Linnaeus) terhadap Perkembangan Nematoda Meloidogyne spp. pada Tanaman Tomat (Lycopersicum esculentum Miller)

Meloidogyne spp. is one of the nematodes that cause root-knot on tomato plants. Thebotanical nematicide that potentially suppresses the nematode is castor bean leaves (Ricinuscommunis Linnaeus) extract. This research aimed to get the lethal concentration (LC50 andLC95) of castor bean leaves extract against nematode larvae in-vitro and their effect on thedevelopment of root-knot nematode (Meloidogyne spp.) in-planta on tomato plant. Theresearch was carried out in Plant Pest and Disease Laboratory and Greenhouse of AgricultureFaculty, Universitas Andalas, using a completely randomized design (CRD) with two stages;in-vitro and in-planta. The research was used the experiment method in-vitro testing consistsof six treatments and five replications, and in-planta testing consists of three treatments andnine replications. The result showed that the application of castor bean leaves extracts invitrocan suppress Meloidogyne spp. larvae with LC50 by 0,27% and LC95 by 0,87%. Theapplication of castor bean leaves extract in-planta with treatment concentration 2xLC95(1,74%) showed effectiveness by 74,69% against the developments of Meloidogyne spp. ontomato plant roots.