Judul: Pathogenicity Test of Fungal Leaf Blight on Sengon Seedlings at Permanent Nursery Dramaga Bogor
Abstrak: Sengon (Paraserianthes falcataria L. Nielsen) merupakan tanaman dari famili Fabaceae yang memiliki banyak potensi, baik secara ekologi dan ekonomi untuk ditanam di lahan rehabilitasi. Penelitian ini bertujuan untuk menguji patogenisitas dan mengidentifikasi cendawan penyebab hawar daun pada bibit sengon. Metode penelitian meliputi kegiatan uji patogenisitas yang terdiri atas pengamatan lapang dan postulat Koch serta identifikasi jenis. Penelitian menggunakan Rancangan Acak Lengkap Faktorial (RALF) dengan uji ANOVA dan uji lanjut Duncan. Hasil uji postulat Koch dapat diketahui bahwa dua isolat menyebabkan hawar pada daun. Hasil uji patogenisitas dapat diketahui bahwa isolat 1 menghasilkan luas serangan dan intensitas serangan paling tinggi dan berbeda nyata dengan isolat lainnya. Hasil identifikasi dapat diketahui bahwa isolat 1 memiliki karakteristik koloni berwarna putih, terdapat sklerotium, tidak memiliki spora, sudut percabangan hifa 90°, bersekat, terdapat penggentingan hifa dekat percabangan, dan terdapat struktur moniloid. Berdasarkan karakteristik tersebut, cendawan ini merupakan Rhizoctonia sp.
Keyword: Characteristics, Koch's postulate, leaf blight, Paraserianthes falcataria, Rhizoctonia sp.

Judul: Fungus Pathogenicity Test and Identification that causes Leaf Disease on Sengon in Dramaga Bogor Permanent Nursery
Abstrak: Sengon (Paraserianthes falcataria (L.) Nielsen) merupakan jenis pohon cepat tumbuh (fast-growing species) dan mudah didapat karena sudah banyak dibudidayakan di Indonesia. Usaha perbanyakan sengon melalui kegiatan pembibitan di persemaian banyak menemui kendala penyakit. Penelitian ini bertujuan mengidentifikasi cendawan penyebab penyakit daun pada tanaman sengon, serta menghitung luas dan intensitas serangan cendawan penyebab penyakit daun pada sengon di Persemaian Permanen Dramaga Bogor. Metode penelitian ini adalah rangkaian uji patogenisitas meliputi pengamatan lapang, postulat Koch, dan identifikasi jenis cendawan. Penelitian menggunakan Rancangan Acak Lengkap Faktorial (RALF). Gejala penyakit yang ditemukan pada daun sengon umur sekitar dua bulan yang ada di lokasi pengamatan adalah penyakit gugur daun, bercak daun, dan hawar daun. Hasil identifikasi cendawan penyebab gugur daun adalah Rhizoctonia sp., cendawan penyebab bercak daun adalah Colletotrichum sp., dan cendawan penyebab hawar daun adalah Fusarium sp.. Fusarium sp. menghasilkan persentase serangan tertinggi dengan luas serangan sebesar 67,34% dan intensitas serangan sebesar 57,28%., Sengon (Paraserianthes falcataria (L.) Nielsen) is a fast-growing tree species and easy to obtain because it has been widely cultivated in Indonesia. Sengon plant propagation is carried out through nursery activities in nurseries. The study aimed to identify the fungus that causes leaf disease on sengon plants and calculate the extent and intensity of attacks by the fungus that causes leaf disease on sengon in the Dramaga Bogor Permanent Nursery. This research method carried out pathogenicity test activities, including field observations, Koch's postulates, and the identification of fungal species. The study used a Completely Randomized Factorial Design (RALF). The disease symptoms found on around two months of sengon leaves old at the observation site were leaf fall, leaf spot, and leaf blight. The results of identifying the fungus that causes leaf fall were Rhizoctonia sp.. This fungus that causes leaf spots is Colletotrichum sp., and the fungus that causes leaf blight is Fusarium sp.. Fusarium sp. resulted in the highest percentage of attacks, with a disease incidence of 67,34% and disease severity of 57,28%.
Keyword: characteristics, identification, Koch's postulates, morphology

Judul: Persamaan Korteweg-de Vries Orde Tinggi untuk Menggambarkan Gerak Gelombang Internal
Abstrak: The ocean can be considered of layers of fluid that each layer has a constant density. Internal waves are waves occur in the interface of every'two layers with different density. Because it occures underneath the surface of the ocean, it is invisible. One of internal waves is internal solitary waves. One of formulation that can describe intemal waves movement is KdV equation. KdV equation is derived from governing equations of ideal fluid in Lagrange formulation using asymptotic method. On this thesis, KdV equation is derived in higher order and then its solution is derived by using internal solitary waves assumption. An example of a two-layer fluid is a case will be used. By using Mathematica6 software, for this case will be obtained the coefficients in lower and higher order explicitly and the corresponding between coefficients and relative lower layer depths and fluid depths, the corresponding between coefficients and relative densities, and also observed the different between solitary waves in lower and higher order.
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