Deskripsi Morfologi Penyakit pada Batang Buah Naga (Hylocereus sp.) dan Pengendaliannya Menggunakan Pestisida Nabati dari Serai Wangi (Cymbopogon nardus)

Dragon fruit (Hylocereus sp.) is a plant introduced from America and started to be cultivated in several areas Indonesia. The high consumer demand one reason increase dragon production. However, during the growth period, stems are at risk for disease. This study aims describe stem morphology of plants that attacked by disease determine effect vegetable pesticides Lemongrass Wangi (Cymbopogon nardus) cultivation area Lampung Province Agricultural Training Center (BPP). research was divided into two stages, namely field observations using survey methods, testing application on diseased plants. Observations made first stage included: morphological symptoms, attack frequency (FS), intensity (IS). showed there were eight types with different symptoms causes, an up 100%. highest percentage caused anthracnose (56.7%), lowest brown rot (13.4%). Disease control trials botanical carried out three diseases almost all individual plants, namely: anthracnose, mosaic, rot. results decrease rot, after four weeks pesticide spraying.