Judul: Population Dynamics of Rice Bug Leptocorisa oratorius (F.) on Rice Field in Sidomulyo Village, Pangandaran Regency.
Abstrak: Tanaman padi (Oryza sativa L.) merupakan salah satu tanaman pangan utama di Indonesia. Hama menjadi salah satu faktor pembatas dalam peningkatan produksi padi. Penelitian ini bertujuan mengetahui dinamika populasi walang sangit Leptocorisa oratorius pada pertanaman padi di Desa Sidomulyo, Kabupaten Pangandaran, Jawa Barat. Pengamatan walang sangit dilakukan di lahan milik petani di Desa Sidomulyo, Pangandaran. Penelitian dilakukan di lahan padi seluas ± 560 m2. Pengamatan dilakukan secara langsung pada tanaman contoh. Data yang diperoleh dari hasil pengamatan dan hasil identifikasi diolah menggunakan Microsoft Office Excel 2010, kemudian ditampilkan dalam bentuk tabel. Data hasil pengamatan menunjukkan imago walang sangit mulai ditemukan pada pertanaman padi umur 56 HST dengan nilai rata-rata sebesar 3,67 ± 2,32 ekor. Nimfa kecil pada umur 63 HST dengan nilai rata-rata 2,13 ± 2,17 ekor dan nimfa besar pada umur 66 HST dengan nilai rata-rata 1,33 ± 1,35 ekor. Secara keseluruhan puncak populasi imago, nimfa kecil, dan nimfa besar terjadi pada umur 87 HST masing-masing sebesar 27,07 ± 3,10 (imago), 20,40 ± 3,29 (nimfa kecil), dan 28,33 ± 3,64 (nimfa besar). Proporsi imago tertinggi terjadi pada umur tanaman 56 HST yaitu sebesar 100%. Tingkat kerusakan bulir padi akibat serangan walang sangit mencapai 29,02%. Musuh alami yang ditemukan di pertanaman yaitu dari kelompok predator yang meliputi Pardosa pseudoannulata, Oxyopes sp., Andrallus spinidens, dan Paederus fuscipes. Kata kunci : musuh alami, struktur umur, tanaman padi, walang sangit, Rice (Oryza sativa L.) is one of the main food crops in Indonesia. Pests are one of the limiting factors in increasing rice production. This study aims to determine the population dynamics of the Leptocorisa oratorius in Sidomulyo Village, Pangandaran Regency, West Java. Observations of rice bug were carried out on farmer's land in Sidomulyo Village, Pangandaran. The study was conducted on an area of ± 560 m2. Observations were made directly on sample plants. The data obtained from observations and identification results were processed using Microsoft Office Excel 2010, then displayed as tables. Data from the observation showed that rice bug were found at 56 DAP age of rice planting with an average value of 3.67 ± 2.32 individuals. Small nymphs at 63 DAP with an average value of 2.13 ± 2.17 and large nymphs at 66 DAP with an average value of 1.33 ± 1.35. Overall the peak population of adult, small nymph, and large nymph occurred at the age of 87 DAP, respectively 27.07 ± 3.10 (adult), 20.40 ± 3.29 (small nymph), and 28.33 ± 3 .64 (large nymph). The highest proportion of adults occurred at the age of 56 DAP which was 100%. The level of damage to rice grains due to attacks by the rice bug reached 29.02%. The natural enemies found in the plantations were from a group of predators which included Pardosa pseudoannulata, Oxyopes sp., Andrallus spinidens, and Paederus fuscipes. Keywords: age structure, natural enemies, rice plants, rice bugs
Keyword: age structure, natural enemies, rice plants, rice bugs