Judul: Preparation of Integrated Pest Management Design on Organic Farming Land at Rosy's Veggies Farm Sukabumi
Abstrak: Pertanian organik merupakan salah satu cara budidaya yang dapat mendukung pelestarian lingkungan dan tidak terlepas dari serangan hama. Pengendalian hama terpadu merupakan salah satu upaya untuk mengatasi hama yang menyerang pertanian organik. Rosy's Veggies Farm merupakan salah satu pertanian organik yang belum sepenuhnya menerapkan prinsip pengendalian hama terpadu dalam memantau dan mengendalikan hama. Kegiatan ini bertujuan mengembangkan desain pengendalian hama terpadu yang sesuai dengan pertanian organik di Rosy's Veggies Farm Sukabumi.Kegiatan ini meliputi pemantauan serangga menggunakan 3 jenis perangkap yaitu yellow sticky trap, pitfall trap dan light trap, pengamatan tanaman bergejala pada tanaman brokoli, buncis, dan sawi pahit, dan pengembangan desain pengendalian hama terpadu yang spesifik. Dari hasil perangkap, hama banyak ditemukan pada yellow sticky trap. Hama utama pada brokoli adalah Crocidolomia pavonana dan Myzus persicae, hama pada sawi pahit adalah Bradybaena similaris, Phyllotreta striolata dan Crocidolomia pavonana, hama pada buncis adalah Liriomyza sp. dan Henosepilachna sp. Berdasarkan hasil pengamatan, wawancara dan keterlibatan langsung dalam proses pengendalian hama, maka dapat diusulkan rancangan yang mengikuti pengendalianhama terpadu yaitu pemanfaatan PGPR, musuh alami, agens hayati, pestida nabati, tumpang sari dan biofumigasi., Organic farming has been championed as an environmental friendly farming methods and is align with conservation issues, however, the crops are still not immune from pest attacks. Integrated pest management is one of the efforts to overcome pests that attack organic farming. Rosy's Veggies Farm, an organic farm in Sukabumi, Jawa Barat has not fully implemented the principle of integrated pest management in their pest monitoring and pest management practices. This activity aimsto develop an integrated pest control design that issuitable for organic farming at Rosy's Veggies Farm Sukabumi. This activity includes insect monitoring using 3 types of traps, yellow sticky trap, pitfall trap and light trap, observation of symptomatic plants in broccoli, chickpea and bitter mustard plants, and development of specific integrated pest management designs. From the trap results, many pests were found in the yellow sticky trap. The main pests on broccoli were Crocidolomia pavonana and Myzus persicae, pests on bitter mustard were Bradybaena similaris, Phyllotreta striolata and Crocidolomia pavonana, pests on chickpeas were Liriomyza sp. and Henosepilachna sp. Based on the results of observations, interviews and direct involvement in the pest management process, a design that follows integrated pest control can be proposed, use of PGPR, natural enemies, biological agents, vegetable pesticides, intercropping and biofumigation.
Keyword: Insect monitoring, integrated pest control, organic farming

Judul: Pengendalian Hama dan Penyakit Tanaman Stroberi dengan Sistem Biointensif di La Fresa Farm, Kabupaten Bandung
Abstrak: Pengendalian hama dan penyakit stroberi (Fragaria X ananassa) yang umum dilakukan adalah dengan penyemprotan pestisida yang dapat menimbulkan dampak negatif terhadap lingkungan. Hal ini mendorong pengembangan produksi stroberi yang ramah lingkungan dengan sistem biointensif. Penelitian ini bertujuan menginventarisasi hama dan penyakit serta mengetahui pengaruh sistem biointensif terhadap hama, penyakit dan produksi stroberi. Pengamatan dilakukan setiap minggu sebanyak tujuh kali dengan menginventarisasi jenis dan populasi hama serta intensitas penyakit pada tiga lahan dengan metode penanaman berbeda, yaitu rak, bedengan, dan polybag. Pengujian biointensif dilaksanakan menggunakan rancangan acak kelompok dengan tiga perlakuan kombinasi mikroba dan solarisasi serta perlakuan pestisida kimia dan kontrol. Mikroba agens hayati yang digunakan adalah Bacillus polymixa, Pseudomonas fluorescens, Rhizobium sp., Lecanicillium sp., Bacillus thuringiensis, Serratia marcescens dan Trichoderma hamatum. Tungau, thrips, dan ulat grayak ditemukan dengan populasi masing-masing 0,31-1,74 ekor/tanaman, 0,08-0,51 ekor/tanaman, dan 0,08-1,63 ekor/tanaman. Penyakit yang dominan ditemukan adalah bercak daun (Neopestalotiopsis sp.) dengan insidensi 41-100% dan severitas 10,25-38%. Hasil pengujian menunjukkan bahwa solarisasi tanah dapat meningkatkan suhu tanah hingga 58,50 oC. Sistem biointensif dapat menekan severitas penyakit bercak daun dan ulat grayak serta meningkatkan produksi lebih baik dibandingkan kontrol. Produksi tertinggi terdapat pada perlakuan BIO 2 dan BIO 3 sebesar 37,14 dan 36,96 g/tanaman., Strawberry (Fragaria X ananassa) pests and diseases control are commonly carried out by spraying pesticides that can cause negative impacts on the environment. This encourages the development of environmentally friendly strawberry production with a biointensive system. This study aims to inventory pests and diseases and to determine the influence of biointensive systems on pests, diseases and strawberry production. Observations were carried out seven times a week by inventorying the types, populations of pests and disease intensity in three fields with different planting methods, namely racks, beds and polybags. The biointensive test was carried out using a randomized block design with three treatments combining microbes and solarization as well as chemical pesticide treatments and control. The biocontrol microbes used include Bacillus polymixa, Pseudomonas fluorescens, Rhizobium sp., Lecanicillium sp., Bacillus thuringiensis, Serratia marcescens and Trichoderma hamatum. Mites, thrips, and armyworms were found with populations of 0,31-1,74 individuals/plant, 0,08-0,51 individuals/plant and 0,08-1,63 individuals/plant, respectively. The dominant disease found was leaf spot (Neopestalotiopsis sp.) with an incidence of 41-100% and a severity of 10,25-38%. The test results showed that soil solarization can increase soil temperature up to 58,50 oC. The biointensive system can suppress the severity of leaf spot and armyworm and increase production better than control. The highest production was found at BIO 2 and BIO 3 treatments of 37,14 and 36,96 g/plant.
Keyword: Bacillus polymixa, Bacillus thuringiensis, Lecanicillium sp., Pseudomonas fluorescens, Trichoderma hamatum

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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