Judul: Serangga Hama Menusuk-mengisap pada Tanaman Terung dan Populasi Kutu Putih di Tiga Tanaman Solanaceae
Abstrak: Terung (Solanum melongena L.) merupakan salah satu komoditas penghasil buah yang berasal dari Famili Solanaceae dan banyak digemari masyarakat. Penurunan produktivitas tanaman terung dapat dipengaruhi oleh tingkat kepadatan organisme pengganggu tanaman yang menyerang tanaman budidaya. Serangan hama merupakan salah satu faktor yang dapat mengakibatkan penurunan produksi secara kualitatif dan kuantitatif. Saat ini kutu putih terung ditemukan menyerang tanaman terung di Kecamatan Sukamakmur dan Kecamatan Simpang tiga, Aceh Besar. Oleh karena itu, penelitian ini dilakukan untuk mengetahui kepadatan populasi dan mengidentifikasi hama menusuk-mengisap dan mengetahui preferensi kutu putih pada 3 tanaman uji. Penelitian ini dilakukan di dua lokasi, yaitu Desa Lampisang dan Desa Blang Preh. Pengamatan hama dan perhitungan populasi hama menusuk mengisap dilakukan pada 10 tanaman sampel secara diagonal. Uji preferensi kutu putih dilakukan pada 3 tanaman Solanaceae, yatu terung, tomat dan cabai dilakukan untuk melihat kemampuan bertahan hidup dan kepadatan populasi. Hasil penelitian menunjukkan hama yang menyerang pertanaman terung di lapangan diantaranya adalah Ferrisia sp 1., Coccidohystrix sp 1., Aphis sp 1., Bemisia sp 1., dan Empoasca sp 1. Populasi hama di lahan Desa Lampisang lebih tinggi dibandingkan hama di lahan Desa Blang Preh. Preferensi kutu putih Coccidohystrix sp 1. tertinggi terjadi pada pengamatan 30 HSI (hari setelah infestasi) pada tanaman uji terung dan tomat. Tanaman tomat berpotensi menjadi inang alternatif selain tanaman terung, karena kutu putih Coccidohystrix sp 1. juga menyukai tanaman tomat. Selain itu, kutu putih Coccidohystrix sp 1. juga ditemukan menyerang gulma famili Asteraceae., Eggplant (Solanum melongena L.) is one of the fruit-producing commodities from the Solanaceae family and is very popular with the public. The decrease in eggplant productivity can be influenced by the density of plant pests that attack cultivated plants. Pest is one of the factors that can lead to a decrease in production qualitatively and quantitatively. Currently, eggplant mealybugs have been found attacking eggplant plants in Sukamakmur and Simpang Tiga sub districts, Aceh Besar. Therefore, this study was conducted to determine the population density and identify sap-sucking pests and to determine the preference of mealybugs on the 3 test plants. This research was conducted in two locations, namely Lampisang Village and Blang Preh Village. Observations of pests and population calculations of sap-sucking pests were carried out on 10 plants, which were sampled diagonally. The mealybug preference test was carried out on 3 Solanaceae plants, namely eggplant, tomato and chili to observe the survival ability and population density. The results showed that the pests that attacked eggplant plantations in the field were Ferrisia sp 1., Coccidohystrix sp 1., Aphis sp 1., Bemisia sp 1., and Empoasca sp 1. The population of pests in Lampisang Village was higher than those in Blang Preh Village. Based on the 30-DAI observations (days after infestation) of mealybug’s feeding preference, tomato plant was also a potential host plant other than eggplant. In addition, the mealybug Coccidohystrix sp 1. was also found attacking weeds of the Asteraceae family.
Keyword: Kutu putih Coccidohystrix sp 1, serangga pengisap, populasi, preferensi

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: 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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