Judul: Inventarisasi Hama pada Tanaman Famili Araceae dan Aplikasi Dua Bahan Aktif Insektisida terhadap Kutuputih Ferrisia virgata
Abstrak: Famili Araceae merupakan salah satu jenis flora yang banyak tumbuh di Indonesia. Kendala yang dihadapi oleh pengusaha tanaman hias seperti Minaqu Indonesia antara lain gangguan hama dan penyakit tanaman (sejak fase vegetatif hingga fase generatif), suhu dan kelembapan, serta pengaruh dari media tanam yang digunakan. Salah satu faktor yang menghambat budi daya tanaman hias di Minaqu Indonesia yaitu serangan kutu tanaman. Penelitian ini bertujuan menginventarisasi hama-hama yang menyerang tanaman Famili Araceae dan menguji keefektifan insektisida berbahan aktif abamektin dan profenofos dalam mengendalikan serangan hama pada tanaman Famili Araceae. Pengamatan dilakukan secara langsung pada tanaman contoh yang ditentukan secara acak sistematis pada setiap rak tanaman. Hama yang ditemukan diidentifikasi di laboratorium. Selanjutnya, dilakukan pengujian aplikasi insektisida pada tanaman. Kegiatan wawancara juga dilakukan kepada staf untuk mengetahui teknik budi daya. Hama yang ditemukan menyerang tanaman Famili Araceae di Minaqu Indonesia yaitu Ferrisia virgata, Planacoccus minor, Pseudococcus jackbeardsleyi, Aleurodicus dispersus, Macrosiphoniella sanborni, Thrips parvispinus, Spodoptera litura, Tetrix sp., dan Parmarion martensi. Populasi serangga hama yang paling banyak ditemukan yaitu F. virgata pada tanaman Syngonium sp. Insektisida abamektin lebih efektif mengendalikan kutuputih F. virgata dibandingkan dengan profenofos., Family Araceae is one type of flora that grows in Indonesia. Entrepreneurs face obstacles to growing ornamental plants, such as pests and diseases, temperature, humidity, and the influence of the growing media. One factor that hinders the cultivation of ornamental plants in Minaqu Indonesia is the attack of scale insects. The objectives of this study were to observe the pests that attack ornamental plants of the Family Araceae and examine the effectiveness of two active ingredients of insecticide, abamectin and profenofos, in controlling Ferrisia virgata. Plant pests and their population were observed directly on sample plants. The pests found are then identified in the laboratory. Furthermore, the insecticides were applicated to other sample plants. Interviews were conducted with Minaqu Indonesia staff to get information about cultivation techniques. The pests attacking the Family Araceae plants in Minaqu Indonesia were Ferrisia virgata, Planacoccus minor, Pseudococcus jackbeardsleyi, Aleurodicus dispersus, Macrosiphoniella sanborni, Thrips parvispinus, Spodoptera litura, Tetrix sp., and Parmarion martensi. The most abundant population of insect pests was F. virgata on Syngonium sp. Abamectin is more effective to control mealybug F. virgata than profenofos.
Keyword: ornamental plants, scale insect, abamectin, profenofos

Judul: Eksplorasi Cendawan Entomophthorales pada Beberapa Spesies Kutuputih dan Kutukapuk pada Berbagai Tanaman Hias di Bogor dan Cianjur
Abstrak: The ornamental plants are the ones of the high economic valued horticultural crops that have beauty and a certain appeal. However, there are several problems of the cultivation efforts to meet consumen desire to face a variety of problems, especially plant pests (OPT), such as insect pests, fungi, bacteria, viruses, and nematodes. The mealybugs (Hemiptera: Pseudococcidae) and ground pearls (Hemiptera: Margarodidae) have been considered as the important pests causing seriously problems in ornamental plants. The objective of this research was to explore the Entomophthoralean fungi associated with several species of mealybugs and ground pearls. The insects were sampled from September 2012 until February 2013, at the Village Babakan raya (District Darmaga) and Cibeber District, Cianjur. There were five sampled ornamental plants. Fifty insects were sampled from each plant. The samples were preserved in 30 ml screw cup vials filled with 70% alcohol. These were later processed in the laboratory to confirm presence of entomophthorealan fungus. Microscope slide squash mounts in lactophenol cotton blue were made for the insects on each plant. Each insect was examined with a microscope to determine if secondary conidia, hyphal bodies, conidiophores, primary conidia, and resting spores were present. Developmental stages of the fungus founded were hyphal bodies, primary conidia, secondary conidia, and saprophytic fungi. The fungus infection in mealybug and ground pearls was very different. There was no fungus infection on the ground pearls scoop in ornamental plant, jasmine and anthurium. The entomophthoralean fungus occurred on mealybug in the garden croton, Aspar and Agave with high levels of fungus infection.
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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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