Judul: Serangan Uret Dan Cara Pengendaliannya Pada Tanaman Eucalyptus Hybrid Di Hutan Tanaman Pt. Toba Pulp Lestari Sektor Aek Na Uli Sumatera Utara
Abstrak: PT Toba Pulp Lestari Tbk is one of the companies which undertake the business of Industrial Plantation Forest (HTI) in Sumatra Utara Province. The objective of the undertaking was producing pulp wood for paper raw materials. The developed plant species was Eucalyptus spp which constituted a fast growing species. According to information from PT Toba Pulp Lestari, one kind of pest which often attacks Eucalyptus spp was insect grub. The attack by this grub often occurs in Sector of Aek Na Uli. This grub attacks roots of plants which are 1- 3 months old, and up to now this problem has not been able to be controlled yet. The objectives of this research were determining the kinds of grub which attacked Eucalyptus in the HTI area of Toba Pulp Lestari in Aek Na Uli sector, determining the effect of attack and the extent of loss created by the grub attack, learning the controlling technique practiced by the company, and learning the effectiveness of insecticide for controlling the grub. edit. This research was conducted in 2 months old Eucalyptus hybrid plants in compartment D 095 with area size of 5.8 ha in Aek Nauli sector, the province of North Sumatra, from 1 April through 20 May 2008. Equipments used in this study were 25 m plastic rope, 14 m plastic rope, compass, wooden pegs, digital camera, and insect collection bottles. Materials used in this study were Karbofuran 3-G and formalin 2 %. Research procedure comprised the counting of the number of eucalypt trees existing in the measurement plot, counting the number of eucalypt trees which were attacked by the grub, examining the tree condition which suffered attack from the grub (wilting, drying, dying), and collecting the various kinds of attacking grubs for identification purpose. Research results showed that percentage of grub growth in each plot was 90.67 % on the average. Species of grub which attacked eucalypt trees in compartment D 095 were Leucopholis rorida, Lepiodata stigma, and Euchlora viridis. On the basis of attack percentage in each measurement plot, the grub attack on Eucalyptus hybrid was categorized as nearly uniform in all compartments. Percentage of plants which suffered attack by grub in compartment D 095 reached 18 % or around 240 trees per hectare. The material loss due to attack by grub in compartment D 095 Rp 189.976,8. Control action conducted in the field to overcome the attack by this grub was by replanting of failures. The use of Karbofuran 3 – G with dosage of 10 gram / planting hole was effective enough to control the grub attack. Key words: PT Toba Pulp Lestari, grub, Eucalyptus hybrid, compartment, Karbofuradan 3-G.
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Judul: Inventarisasi Hama dan Penyakit pada Pembibitan Tanaman Eucalyptus di Sentra Pembibitan 2 PT RAPP, Kabupaten Pelalawan, Riau
Abstrak: Perkembangan industri pulp dan kertas di Indonesia terus meningkat dari tahun ke tahun sehingga perlu adanya teknologi dan bahan baku yang cukup serta memadai. Bahan baku yang umumnya digunakan berupa jenis kayu hardwood yang telah dipersiapkan di area Hutan Tanaman Industri (HTI). Tanaman Eucalyptus sp. merupakan salah satu jenis tanaman prioritas yang dikembangkan dalam pengelolaan HTI yang diperuntukkan sebagai kayu serat. Salah satu masalah yang dapat mengganggu pertumbuhan tanaman dan mengakibatkan kerugian adalah serangan dari organisme pengganggu tanaman (OPT). Dalam beberapa kasus, serangan penyakit pada tanaman dapat mengakibatkan terhambatnya pertumbuhan tanaman, menurunnya kualitas kayu, bahkan kematian tanaman. Penelitian bertujuan mengetahui jenis-jenis hama dan penyakit, serta budi daya tanaman Eucalyptus dari sampel bibit bergejala yang diambil dengan metode purposive sampling di Sentra Pembibitan 2 PT RAPP, Kecamatan Pangkalan Kerinci, Kabupaten Pelalawan, Riau. Identifikasi patogen dilakukan dengan membandingkan hasil pengamatan gejala serta tanda di lapangan dan laboratorium dengan literatur. Inventarisasi hama dilakukan dengan studi literatur berdasarkan data hama ditemukan yang telah tersedia. Penyakit yang menyerang bibit Eucalyptus adalah bercak daun Quambalaria, bercak daun dan batang Cylindrocladium, bercak daun Kirramyces, layu pucuk dan daun Rhizoctonia, dan hawar daun Xanthomonas. Hama yang ditemukan menyerang bibit tanaman Eucalyptus, yaitu ulat penggulung daun (Strepsicrates macroptena), tungau, kutu kebul (eucalyptus whitefly), thrips (Thrips autralis), wereng, kutu daun, dan Helopeltis theivora., The development of the pulp and paper industry in Indonesia continues to increase from year to year, which requires adequate technology and raw materials. Raw materials that are generally used are hardwood species that have been prepared in the Industrial Plantation Forest (HTI) area. Eucalyptus sp. is one of the priority plant species developed in HTI management which is intended as fiber wood. One of the problems that can interfere with plant growth and cause losses is the attack of plant pest organisms (OPT). In some cases, disease attacks on plants can result in inhibition of plant growth, decreased wood quality, and even plant death. This study aims to determine the types of pests and diseases, as well as the cultivation of Eucalyptus from symptomatic seedling samples taken by purposive sampling method at PT RAPP Nursery Center 2, Pangkalan Kerinci District, Pelalawan Regency, Riau. Pathogen identification was carried out by comparing observations of symptoms and signs in the field and laboratory with the literature. Pest inventory was conducted by literature study based on available pest data. Diseases that attack Eucalyptus seedlings are Quambalaria leaf spot, Cylindrocladium leaf and stem spot, Kirramyces leaf spot, Rhizoctonia shoot and leaf wilt, and Xanthomonas leaf blight. Pests found attacking Eucalyptus seedlings were leafroll caterpillars (Strepsicrates macroptena), mites, whitefly (eucalyptus whitefly), thrips (Thrips autralis), leafhoppers, aphids, and Helopeltis theivora.
Keyword: Eucalyptus sp., industrial forest plantations, pathogens, diseases

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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