Judul: Distribution of Mealybugs (Hemiptera: Pseudococcidae) and Entomophthoralean Fungus on Various Plants at Banyumas Regency
Abstrak: Beberapa kutu putih merupakan spesies hama yang termasuk serangga yang mudah menyebar dengan cepat dan memiliki banyak tanaman inang. Ada beberapa kendala ketika upaya pengendalian kutu putih dilakukan. Tubuh kutu putih ditutupi dengan lapisan lilin yang bersifat hidrofobik, sehingga serangga ini sulit dikendalikan dengan pengendalian kimiawi. Penelitian ini bertujuan untuk mengidentifikasi spesies kutu putih pada beberapa tanaman, dan mengetahui asosiasinya dengan Cendawan Entomophthorales. Penelitian dilakukan di tiga kecamatan di Kabupaten Banyumas. Setiap spesies kutu putih pada setiap tanaman diambil sampelnya. Serangga sampel dimasukkan ke dalam botol berisi alkohol 70% untuk selanjutnya dilakukan pemeriksaan laboratorium. Serangga sampel dikumpulkan dengan menggunakan metode purposive random sampling. Data ditabulasi dengan Microsoft Excel 2013 dan SAS 9.0.2. Terdapat 8 spesies kutu putih yang ditemukan pada berbagai tanaman di Kabupaten Banyumas. Infeksi cendawan Entomophthorales terjadi pada Ferrisia dasyrilii, dan Pseudococcus jackbeardsleyi. Kutu putih Paracoccus marginatus merupakan spesies yang paling banyak ditemukan pada tanaman singkong di Kabupaten Banyumas. Infeksi cendawan Entomophthorales pada tanaman singkong terjadi pada Ferrisia virgata di Kecamatan Cilongok, dan pada spesies P. marginatus di Kecamatan Rawalo., Some mealybugs are pest species including insects that spread quickly and have many host plants. There are several obstacles when efforts to control mealybugs are carried out. The mealybugs body is covered with a layer of wax. This wax is hydrophobic, making the insect difficult to be controlled by chemical spraying. The study aimed to identify mealybugs species on several plants, and determine its association with entomophthoralean fungus. The research was carried out at three districts at Banyumas Regency. Each species of mealybugs on each plant was sampled. Sampled insects were put in vial containing 70% alcohol for the next laboratory’s examination. Sampled insects were collected using purposive random sampling method. Data were tabulated by Microsoft Excel 2013 and SAS 9.0.2. There were 8 species of mealybugs found on various plants at Banyumas Regency. Infection of Entomophthoralean fungus occurred on Ferrisia dasyrilii, Paracoccus marginatus, Planococcus minor, Pseudococcus cryptus, and Pseudococcus jackbeardsleyi. Species P. marginatus was the most species found on cassava plants at Banyumas Regency. The infection of Entomophthoralean fungus on cassava plant occurred on Ferrisia virgata at Cilongok District, and on P. marginatus at Rawalo District.
Keyword: Pseudococcidae, pest control, infection rate

Judul: Diversity of Mealybugs (Hemiptera: Pseudococcidae) Associated with Entomophthorales Fungi in Various Plants in Prembun District, Kebumen Regency
Abstrak: Kutu putih merupakan hama polifag yang memiliki kisaran inang yang beragam. Tanaman inang utama kutu putih antara lain singkong, pepaya, terung, dan jambu biji. Pengendalian hayati kutu putih secara alami terjadi karena adanya musuh alami, termasuk cendawan entomophthorales. Cendawan tersebut menjadi salah satu agen hayati yang mampu mengendalikan kelimpahan populasi kutu putih di lapangan. Cendawan entomophthorales merupakan cendawan entomopatogen yang bersifat obligat. Kelimpahan populasi kutu putih memengaruhi tingkat infeksi cendawan entomophthorales. Cendawan entomophthoales Neozygtes fumosa dilaporkan mampu menekan populasi kutu putih Paracoccus marginatus. Identifikasi infeksi cendawan entomophthorales dilakukan pada beberapa spesies kutu putih yang diambil dari berbagai jenis tanaman inang. Fase cendawan yang ditemukan selama penelitan adalah primary conidia, secondary conidia, hypal bodies, resting spore dan cendawan saprofit yang berasosiasi dengan cendawan entomophthorales. Tingkat infeksi pada P. marginatus pada tanaman singkong mencapai 50%., The mealybugs are a polyphagous insects and it has been confirmed that there are many plant families to be hosted. The main host plants of mealybugs were cassava, papaya, eggplant, and guava. One of natural biological controls of mealybugs occur in the field is the entomophthorlean fungus. The objective of this research is to determine several species of mealybugs on several plants and their association with the entomophthoralean fungus. Identification of mealybugs and the infection of entomophthoralean fungus were carried out on several species of mealybugs on various of host plants. The results show that there are several species found at several sampled plants. The phase of the entomophthoralean fungi found were primary conidia, secondary conidia, hyphal bodies, and saprophytic fungi. One species of entomophthoralean fungus, Neozygtes fumosa, was found to be able to suppress the population of papaya mealybugs, Paracoccus marginatus. Infection level of this fungus on Paracoccus marginatus in cassava plants reached at 50%.
Keyword: Infection rate, Neozygites fumosa, Paracoccus marginatus, pest control, population

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.
Keyword: