Judul: Coleoptera that Associated with Acacia (Acacia crassicarpa) and Implementation of Integrated Pest Management in PT RAPP, Pelalawan, Riau
Abstrak: Pohon Acacia crassicarpa umumnya digunakan sebagai bahan utama pembuatan pulp dan kertas. Salah satu hama yang menyerang pohon A. crassicarpa ialah kumbang Coleoptera. Selain sebagai hama, beberapa jenis kumbang juga berperan sebagai musuh alami yang berpotensi untuk menekan populasi hama lainnya serta mendukung penerapan pengendalian hama terpadu (PHT). Pengendalian hama terpadu dilakukan sebagai koreksi terhadap kebijakan pengendalian hama yang mengutamakan penggunaan pestisida. PHT dilakukan dengan mengkombinasikan beberapa metode pengendalian yang salah satunya ialah pemanfaatan musuh alami. Tujuan magang ini mengetahui kumbang yang berasosiasi dengan A. crassicarpa dan penerapan pengendalian hama terpadu di PT RAPP, Pelalawan, Riau. Kegiatan magang dilakukan dengan praktek langsung dengan mengikuti arahan pembimbing magang, mengikuti aktivitas di Laboratorium Entomologi, wawancara dan pengamatan mandiri dengan mengoleksi kumbang dari enam kompartemen hutan A. crassicarpa yang berumur 3-7 bulan untuk dilakukan evaluasi dan identifikasi menggunakan awetan serangga di laboratorium dan buku Borror et al. 1996 sebagai acuan. Kumbang yang berpotensi sebagai hama ialah Rhytiphora sp. dan Alaus sp., sedangkan kumbang yang berperan sebagai musuh alami ialah Coelophora sp dan Halmus sp. Beberapa pengendalian hama secara terpadu dilakukan di PT RAPP seperti pemanfaatan parasitoid telur Trichogamma sp., green lace wing, Sycanus sp. Eocanthecona sp., kumbang Menonchilus sp., dan feromon seks Helopeltis sp., Acacia crassicarpa is a tree species commonly used as the main ingredient for pulp and paper. Among the pests that attack A. crassicarpa tree are the insect belong to the order of Coleoptera (beetles). Apart from being pests, some beetles are known as natural enemies of others insects, that have potential to suppress pest populations and to support the implementation of integrated pest management (IPM). Integrated pest management is carried out as a correction to pest control policies that prioritize the use of pesticides. IPM is done by combining several control methods that one of them is the use of natural enemies. The purpose of this internship was to identify beetles which have association with A. crassicarpa and to know the application of integrated pest management in Industrial Forest Plantation at PT RAPP, Riau. The internship was carried out by following the guidance of the supervisor to do direct practices, participating in activities in the Entomology Laboratory, doing interviews and doing independent observations, and collections of beetles from six compartments of 3-7 month-old A. crassicarpa forest for evaluation and identification in the laboratory. Beetles that have potential to be pests of A. crassicarpa were Rhytiphora sp. and Alaus sp., while the beetles that act as natural enemies were Coelophora sp and Halmus sp.. Some integrated pest control practices have been implemented at PT RAPP, such as the use of egg parasitoid, Trichogamma sp, the use of predator (Neuroptera green lace wing, Sycanus sp. Eocanthecona sp., Menonchilus sp.), and the use of sex pheromones of Helopeltis sp..
Keyword: Acacia crassicarpa, beetles, natural enemies, pests, pulp, paper

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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