Judul: Pengetahuan, Sikap, Dan Tindakan Petani  Terhadap Pht Padi Dan Teknik Pengendalian Penggerek Batang Padi Kuning Dengan Feromon Di Kecamatan Kutawaluya, Karawang
Abstrak: Padi (Oryza sativa L.) merupakan komoditas pangan utama yang mempunyai peranan strategis untuk pembangunan pertanian dan perekonomian negara. Penurunan produktivitas padi dapat disebabkan oleh OPT, salah satunya yaitu hama penggerek batang padi kuning (PBPK). Pengendalian PBPK yang diterapkan oleh petani masih sangat bergantung dengan penggunaan insektisida sintetik. Metode pengendalian PBPK terbaru yang lebih ramah lingkungan, yaitu dengan menggunakan feromon seks yang berfungsi untuk mengganggu perkawinan hama penggerek batang padi kuning. Penelitian ini bertujuan memberikan informasi mengenai respon penerima aplikasi Yellow Stem Borer Mating Disruption Pheromone (YSB-MDP) yang dilihat dari isu sosial dan ekonomi sesuai dengan tingkat pengetahuan, sikap dan tindakan petani di Kecamatan Kutawaluya, Kabupaten Karawang, Provinsi Jawa Barat. Survei dilakukan dengan mengisi borang pertanyaan dan wawancara secara terstruktur terhadap 60 petani responden yang terlibat dengan pemakaian YSB-MDP. Data hasil survei diolah dengan menggunakan perangkat lunak Microsoft Excel 2010 yang selanjutnya dianalisis secara kualitatif dan kemudian disajikan secara deskriptif. Hasil penelitian menunjukkan bahwa pengetahuan, sikap dan tindakan petani memiliki dampak yang berbeda dalam mengelola hama dan penyakit sesuai dengan karakteristik, sosial, dan budaya petani. Hasil analisis deskriptif penelitian menunjukkan bahwa petani telah memahami mengenai metode PHT, akan tetapi mereka masih belum sepenuhnya menerapkan praktek PHT di lahan mereka. Pengendalian PBPK dengan menggunakan YSB-MDP memperoleh antusiasme tinggi di kalangan petani., Rice (Oryza sativa L.) is the main food commodity with a strategic role in agricultural development and the country's economy. Decreased rice productivity can be caused by pests, one of which is the yellow stem borer (YSB). YSB control applied by farmers is still very dependent on synthetic insecticides. The latest YSB control method that is more environmentally friendly is by using sex pheromones that disrupt the mating of the yellow rice stem borer. This study aims to provide information about the response of recipients of the Yellow Stem Borer Mating Disruption Pheromone (YSB-MDP) application in terms of social and economic issues following with the level of knowledge, attitudes and actions of farmers in Kutawaluya, Karawang District, West Java. The survey was conducted by filling out question forms and structured interviews with respondent farmers using YSB-MDP. The survei data were processed using Microsoft Excel 2010 software which was then analyzed qualitatively and presented descriptively. The results showed that the knowledge, attitudes and actions of farmers have different impacts on managing pests and diseases according to the characteristics, social, and culture of farmers. The results of the descriptive analysis of the study showed that farmers had understood the IPM method, but they still needed to fully implement IPM practices on their land. YSB control using YSB-MDP reached high enthusiasm among farmers.
Keyword: hama, penggerek batang padi kuning, seks feromon, wawancara, pests, interview, mating insect, yellow stem borer

Judul: Perilaku Petani dalam Pengendalian Hama Terpadu Penggerek Batang Padi Kuning di Kecamatan Ciasem Kabupaten Subang
Abstrak: Hama penggerek batang kuning (Scirpophaga incertulas) telah menurunkan produksi padi di Indonesia secara signifikan sehingga diperlukan metode pengendalian yang tepat berdasarkan pengendalian hama terpadu (PHT). Penelitian ini bertujuan untuk mendapatkan informasi dan menganalisis pengetahuan, sikap, dan praktik petani responden terhadap pengendalian hama penggerek batang padi di Kecamatan Ciasem, Kabupaten Subang, serta karakteristik agroekosistemnya. Penelitian ini dilaksanakan pada bulan Maret hingga Juni 2023. Lokasi pengamatan tersebar di tiga desa dengan tingkat kerusakan hama yang berbeda dan total petani yang dipilih sebanyak 60 petani. Metode wawancara menggunakan kuesioner terstruktur untuk memperoleh data. Data yang diperoleh kemudian diolah dengan menggunakan MICROSOFT EXCEL 2013 dan dilakukan uji ?2 (Chi-square) untuk melihat hubungan antara karakteristik petani dengan pengetahuan, sikap, dan tindakan dalam pengelolaan tanaman padi pada tingkat a = 5%. Hasil penelitian menunjukkan bahwa petani di lahan dengan tingkat serangan ringan memiliki pengetahuan, sikap, dan tindakan yang lebih baik dibandingkan dengan petani di lahan dengan tingkat serangan sedang dan berat, Yellow stem borer (Scirpophaga incertulas) reduce rice production in Indonesia significantly so appropriate control methods based on integrated pest management (IPM) are needed. This study aims to obtain information and analyze knowledge, attitudes, and practice of respondent farmers towards the management of rice stem borer in Ciasem District, Subang Regency, and the characteristics of agroecosystem as well. This research was conducted from March to June 2023. The observation locations spreaded over three villages with different levels of pest damage and a totally 60 farmers were selected. Interview methods using structured and instructured questionnaires implemented to obtain data. Obtained data was then processed using MICROSOFT EXCEL 2013 and the ?2 (Chi-square) test was conducted to see the relationship between farmer characteristics with knowledge, attitudes, and actions in rice plant management at the a = 5% level. The results showed that farmers in the field with mild infestation had better knowledge, attitudes, and practice compared to the field with moderate and severe infestation.
Keyword: Penggerek batang padi, PHT, Survei, Rice stem borer, IPM, Survey

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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