Judul: Effectiveness of Bacteria Again Important Pests on Melon Plants Supervised
Abstrak: MERI ELIZA. Keefektifan Bakteri Agens Hayati terhadap Hama Penting pada Melon. Dibimbing oleh SURYO WIYONO dan BONJOK ISTIAJI. Penggunaan bakteri sebagai agen biokontrol termasuk upaya mengurangi dampak negatif penggunaan pestisida sintetik. Penelitian ini bertujuan untuk mengetahui efektivitas bakteri P14 dan J8 dalam mengendalikan hama. Penelitian ini dilakukan di perkebunan melon di Desa Jembayat, Kabupaten Tegal, Jawa Tengah pada bulan September hingga November 2021. Pengambilan data dilakukan secara langsung dengan mengamati gejala, tingkat kerusakan hama, serta menghitung populasi hama. Studi ini dilakukan denngan melihat pengaruh aplikasi agens biologis bakteri pada hama utama melon, yaitu kutu daun, kutu putih, lalat buah, dan kumbang daun. Percobaan disusun dalam Rancangan Acak Kelompok (RAK). Daerah penelitian terdiri dari lima blok sebagai ulangan, setiap blok berisi enam perlakuan yang ditandai dengan label.Hasil penelitian menunjukkan bakteri agens hayati P14 dan J8 menekan populasi kutu putih secara nyata pada umur 4 -7 minggu setelah tanam. Selain itu, bakteri P14 dan J8 juga berpengaruh terhadap peningkatan daya kecambah biji melon., MERI ELIZA. Effectiveness of Bacteria Agains Important Pests on Melon Plants. Supervised by SURYO WIYONO and BONJOK ISTIAJI. The use of bacteria as biocontrol agents includes efforts to minimize the negative impact of using synthetic pesticides. This study aims to determine the effectiveness of P14 and J8 bacteria to control pests. This research was conducted on a melon plantation in Jembayat Village, Tegal Regency, Central Java from October 2021 to November 2021. Data collection was carried out directly by observing the symptoms and the damage rate of pests, and calculating the population of pests. This study looked at the effect of the application of bacterial biological agents on major melon pests including aphids, mealybugs, fruit flies and leaf beetles. The experiments were arranged in a Randomized Block Design. The research area consists of five blocks as replicates, each block contains six treatments marked with the label. Research result show treatment of P14 and J8 bacteria agens hayati suppresses the population of mealybugs at some observation date In addition, P14 and J8 bacteria also had an effect on increasing the germination of melon seeds.
Keyword: induced resistance,, mealybugs, Plant Growth Promoting Rhizobacteria (PGPR)

Judul: Effectiveness of Mixture Two Biocontrol Agents (J8 & P14) against Downy Mildew of Melon (Cucumis melo L.).
Abstrak: Produksi melon terus mengalami peningkatan lima tahun terakhir sehingga pengembangan melon kedepan harus mulai memasuki pasar ekspor. Saat ini ekspor melon Indonesia masih relatif rendah karena terkendala regulasi batas maksimum residu (BMR). Tingginya serangan organisme pengganggu tanaman (OPT) membuat petani menggunakan pestisida secara masif hingga melebihi batas. Salah satu OPT melon adalah penyakit embun bulu yang disebabkan Pseudoperenopora cubensis. Oleh karena itu, perlu dicarikan solusi pengendalian penyakit embun bulu yang lebih sehat. Penelitian ini bertujuan mengetahui keefektifan pengendalian campuran dua agen pengendali hayati (J8 & P14) terhadap penyakit embun bulu pada melon (Cucumis melo L.) dengan berbagai cara aplikasi. Metode yang digunakan adalah rancangan acak kelompok (RAK) non faktorial dengan analisis data one way annova dan uji lanjut beda nyata jujur (BNJ) dihitung secara manual. Penggunaan campuran dua bakteri J8 dan P14 dapat meningkatkan daya berkecambah melon. Perlakuan C dapat meningkatkan pertumbuhan yang meliputi tinggi tanaman dan jumlah daun terutama pada umur muda. Seluruh cara aplikasi APH kecuali A, efektif menekan insidensi dan keparahan penyakit. Cara aplikasi APH yang efektif dan tanpa penggunaan fungisida adalah perlakuan C. Keefektifan cara aplikasi C dalam menekan insidensi dan keparahan penyakit embun bulu pada melon sebesar 41,74%., Melon production has continued to increase in the last five years so the development of melons in the future must begin to the export market. Currently, Indonesia's melon exports are still relatively low due to constraints on the regulation of the maximum residue limit (MRLs). The high number of pest attacks makes farmers use pesticides massively to exceed the limit. One of the diseases of melons is downy mildew by Pseudoperonospora cubensis. Therefore, it is necessary to develop alternative control the disease of downy mildew. This research aims to determine the effectiveness of mixture two biocontrol agents (J8 & P14) against downy mildew of melon (Cucumis melo L.). The method used randomize complete block design with one way annova data analysis and further testing of tukey 0,05%. The results of the reasearch using two bacteria J8 and P14 can increase the germination of melons by 11%. Biocontrol agenst (J8 & P14) can improve plant growth (height and number of leaves). Most effective way of applying biocontrol agenst with minimal fungicide is the C treatment (seed treatment, one week old seedling application, and weekly applications). The effectiveness was able to suppress the severity of the disease at control rate of 41.74%.
Keyword: batas maksimum residu (BMR), insidensi, Pseudoperenopora cubensis, effective, Pseudoperonospora cubensis, way of applying

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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