Judul: Biologi phthorimaea operculella zell. (lepidoptera:gelechiidae) dan kerentanan beberapa varietas kentang terhadapnya
Abstrak: Phthorimaea operculella atau ulat umbi kentang, merupakan hama penting pada kentang karena menyerang tanaman di lapang dan umbi di gudang. Penelitian ini dimaksudkan untuk mendapatkan informasi mengenai (i) biologi ulat umbi kentang pada umbi kentang, dan (ii) kerentanan beberapa varietas kentang terhadap ulat umbi kentang. Penelitian dilakukan di laboratorium Ilmu Hama Tumbuhan, Departemen Ilmu Hama dan Penyakit Tumbuhan, Fakultas Pertanian Institut Pertanian Bogor. Dalam penelitian biologi digunakan 30 butir umbi kentang varietas Rapan 106 untuk penentuan masa perkembangan, keperidian ngengat betina dan mortalitas telur, dan 200 butir umbi varietas Rapan 106 untuk penentuan ciri instar. Setiap umbi diinokulasi dengan larva ulat umbi kentang yang baru keluar dari telur kemudian dipelihara secara individual dalam kurungan plastik. Setiap hari dilakukan pengambilan contoh sebanyak 10 ekor larva untuk menentukan banyaknya instar, ukuran tubuh larva serta warna dari setiap instar larva.
Keyword: Potato variety;, Ngengat;, Kepompong;, Bogor Agricultural University;

Judul: Patogenisitas dan keefektifan nematoda entomopatogen Heterorhabditis sp. terhadap penggerek umbi kentang Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae)
Abstrak: Potato tuber moth, Phthorimaea operculella Zell. (Lepidoptera: Gelechiidae) is one of the important potato pest due to the potential loss can reach 100% if not well controlled. One of potential biological agents to control this pest is Entomopathogen Nematode Heterorhabditis. The effectiveness of Heterorhabditis has been studied to control several crop pests. Infective juveniles (IJ’s) of nematodes are able to find and penetrate the insects that live in the soil as well as in the plant tissues. The objective of this research is to study the pathogenicity of the Heterorhabditis sp. against P. operculella in the laboratory with direct and indirect (in the potato tuber) treatment. The experiments were conducted using completely randomized design with 6 treatments and 4 replications. The treatments were based on the density level of nematodes Heterorhabditis sp. (100, 200, 300, 400, and 500 IJ/ml) and the control. The result showed that P. operculella infected by Heterorhabditis sp. has symptoms by reducing the movement and feeding activity. The body of dead insects become soft and the color change to dark brown. For the direct treatment, Heterorhabditis sp. can kill P. operculella within 12 hours after application (HAA). At density level 100 IJ/ml, it can control P. operculella until 85% within 24 HAA. In contrast, the mortality rates of P. operculella in the indirect treatment (in the tubers) was 35% at doses of 1000 IJ/tubers.
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Judul: Sintesis dan Pencirian Membran Komposit Polistirena Tersulfonasi-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: This study focused on synthesis and characterization of sulfonated polystyrene (SPS)-zeolit composite membrane as a proton exchange membrane for direct methanol fuel cell (DMFC). Sulfonation of polistyrene was done by using SO3 gas from oleum at 60 oC. The composite membrane was then synthesized with zeolite composition variation of 3%, 5%, and 7%. The success of the sulfonation process was indicated by the highest degree of sulfonation of PSS membrane with 15% concentration of polystyrene, that was 99.93%. The PSS Fourier transform infrared spectra of the composite membranes showed sulfonate group (-SO3) at 910.44 cm-1 and O-Si-O at 1091 cm-1. Topography study by using atomatic force microscope showed that the sulfonate groups of PSS were covered by the zeolite. The highest water uptake, proton conductivity, and potential difference were showed by the composite membrane with 5% of zeolite, that were 10.17%, 2.0339 10-6 S/cm, dan 15 mV respectively, showing that the PSS membrane can be applied in DMFC system.
Keyword: zeolite, sulfonation, polystyrene, DMFC, composite