Kailan is one of the types of vegetables that can be produced year-round. Shows that from 2021 to 2023, kailan production has decreased due to suboptimal cultivation practices in land management and land limitations caused by the conversion of agricultural land. One of the solutions to this problem is agriculture using a hydroponic system and the application of plant-based pesticides from papaya leaf extract. This research was conducted at the Forever Green Greenhouse, Sukamakmur Village, Babakan Jati Hamlet, Bogor City. (434 mdpl). The research took place from June 2024 to July 2024. The research method used is the experimental method, employing a Single Factor Randomized Block Design (RBD) consisting of 5 treatments, each repeated 5 times. The treatments include A (Control/0% concentration), B (10% concentration), C (30% concentration), D (50% concentration), and E (70% concentration). The observational data were analyzed using analysis of variance and further tested with the Duncan Multiple Range Test (DMRT) at a 5% significance level. The research results indicate that treatment E (70% concentration) yielded the best results for the growth and yield of kailan plants (Brassica oleraceae var. new veg gin) in terms of plant weight (22.075 g), the lowest pest attack intensity (1.975%), and the fastest Lethal Time. (LT50 7,755 h).

Keywords: papaya leaf extract, nft hydroponics, kailan, spodoptera litura

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