Sawi hijau (Brassica rapa L.) merupakan salah satu jenis sayuran yang digemari masyarakat Indonesia. Sayuran ini mudah dibudidayakan dan dapat dikonsumsi segar atau diolah menjadi asinan. Sawi hijau mengandung banyak antioksidan dan vitamin. Kurangnya produksi sawi terjadi karena adanya serangga hama pemakan daun, ulat grayak (Spodoptera litura) salah satu jenis hama pemakan daun yang sangat penting dan potensial menyerang tanaman sawi. Penelitian ini bertujuan untuk Mengetahui pengaruh pemberian pestisida nabati gulma siam terhadap pertumbuhan dan hasil tanaman sawi hijau serta mengetahui intensitas kerusakan tanaman akibat serangan hama. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) 1 faktor dengan 6 perlakuan yang diulang sebanyak 4 kali sehingga diperoleh 24 petak percobaan. Perlakuan dalam penelitian ini yaitu P1 ( kontrol), P2 ( Ekstrak C. odorata konsentrasi 20 ml + 980 ml aquades), P3 (Ekstrak C. odorata konsentrasi 40 ml + 960 ml aquades), P4 (Ekstrak C. odorata konsentrasi 80 ml+ 920 ml aquades), P5 (Ekstrak C. odorata konsentrasi 160 ml + 840 ml aquades), P6 (Ekstrak C. odorata konsentrasi 320 ml + 680 ml aquades). Parameter pengamatan penelitian ini yaitu tinggi tanaman, jumlah daun, lebar daun, intensitas kerusakan, dan berat basah tanaman. Hasil penelitian menunjukan bahwa parameter perlakuan P3 memberikan rata-rata data yang cenderung lebih tinggi pada pengamatan tinggi tanaman 12 HST (21.26 cm), tinggi tanaman 18 HST (34.48 cm), tinggi tanaman 24 HST (36.22 cm). jumlah daun 12 HST (9.13 helai), jumlah daun 18 HST (16.03 helai), jumlah daun 24 HST (21.28 helai). Lebar daun 12 HST (8.75 cm), lebar daun 18 HST (12.7 cm), lebar daun 24 HST (13.3 cm). Parameter perlakuan P6 memberikan rata-rata data cenderung lebih rendah pada pengamatan intensitas kerusakan tanaman 12 HST (11.18 %), intensitas kerusakan tanaman 18 HST (10.2 %), intensitas kerusakan tanaman 24 HST (7.73 %). Berat basah perlakuan P3 24 HST (154.85 gram).
Kata Kunci: Sawi Hijau, Gulma Siam, Ulat Grayak

Green mustard (Arzssica ropa L..) is one of the most popular types of vegetables in Indonesia since easy to cultivate and possibly consumed raw or processed into asinan (pickle-like food) Mustard greens contain lots of antioxidants and vitamins The decreasing mustard production was due to presence of leaf-eating insect known as armyworm (Spodoptera litura), one of the most important leaf-cating the pests which has the potentials to attack the mustard plants. This research aimed to figure out the effect of Siam weed vegetable pesticides to the growth and yield of mustard greens and to know the plant damage intensity caused by the posts. This research used a Randomized Block Design (RAK) of 1 factor with 6 treatments and 4 repetitions to obtain 24 experimental plots. The research treatments included PI (control), P2 (C. odorata extract concentration 20 ml + distilled water 980 ml), P3 (C odorata extract concentration 40 ml + distilled water 960 ml). P4 (C, odorata extract concentration 80 ml + distilled water 920 ml). P5 (C. odorata extract concentration 160 ml + distilled water 840 ml), and P6 (C. odorata extract concentration 320 ml + distilled water 680 ml). The research observation parameters were plant height, number of leaves, leaf width, damage intensity, and wet weight. The results show that the parameters of treatment P3 gave the average data which tended to be higher at the observations of plant height at 12 DAP (21.26 cm), at 18 DAP (34.48 cm), and at 24 DAP (36.22 cm); number of leaves at 12 DAP (9.13 strands), at 18 DAP (16.03 strands), and at 24 DAP (21.28 strands), as well as leaf width at 12 DAP (8.75 cm), at 18 DAP (12.7 cm), and at 24 DAP (13.3 cm). The parameters of treatment P? gave the average data which tended to be lower at the observations of plant damage intensity at 12 DAP (11.18 %), at 18 DAP (10.2%), at 24 DAP (7.73 %); and wet weight of treatment P3 at 24 DAP (154.85 grams). Keywords: Green Mustard, Siam Weed, Armyworm