Judul: Dinamika Populasi Parasitoid Telur Penggerek Batang Padi Kuning Scirpophaga incertulas (Walker) (Lepidoptera: Pyralidae) pada Pertanaman Padi di Kabupaten Klaten
Abstrak: Yellow Rice Stem Borers (Scirpophaga incertulas) is an important pest of rice in Indonesia. Currently, most farmers depend on use of insecticides to control the pest and mostly by propalactic and indiscriminate ways. The practices can disrupt the environment and the activities of natural enemies. This study is to observe the dynamic off egg parasitoid of Yellow Rice stem Borers in three subdistrict (Juwiring, Cawas, and Trucuk) in Klaten, Central Java. Egg clusters were collected and reared to note parasitization every other weeks. This study during Februari-October 2012. The most dominant of egg parasitoid at Juwiring, Cawas, and Trucuk was Tetrastichus schoenobii with percentage 67%, 96%, and 43%. Egg parasitoids were found at Juwiring T. schoenobii, Telenomus rowani, Trichogramma japonicum and Telenomus sp., a hyperparasitoid also discovered at Juwiring is Trichomalopsis sp., at Cawas T. schoenobii and T. rowani were found, and at Trucuk T. schoenobii, T. rowani, and T. japonicum were found. Parasite of egg clusters at rice crops on 0-4 weeks after transplanting was T. schoenobii, and parasite of egg clusters at rice crops on 6 and 8 weeks after transplanting was T. rowani.
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Judul: Sebaran Kelompok Telur Penggerek Batang Padi Kuning dan Parasitoidnya pada Pertanaman Padi di Kabupaten Indramayu
Abstrak: Tanaman padi merupakan salah satu komoditas tanaman pangan utama di Indonesia. Salah satu kendala yang menjadi faktor penghambat dalam upaya peningkatan produktivitas padi adalah kehilangan hasil yang disebabkan oleh serangan hama penggerek batang padi kuning (Scirpophaga incertulas) yang dapat menyerang tanaman padi pada fase vegetatif dan generatif. Penelitian ini bertujuan mengetahui sebaran kelompok telur penggerek batang padi kuning dan parasitoidnya pada pertanaman padi di Kecamatan Losarang, Terisi, dan Cikedung, Kabupaten Indramayu, Jawa Barat. Penelitian yang dilaksanakan pada bulan Desember 2021 hingga Februari 2022 meliputi pengumpulan kelompok telur di persemaian, wawancara dengan petani dan pemilik kios pestisida untuk mengetahui hubungan antara distribusi kelompok telur dengan intensitas penggunaan pestisida. Hasil penelitian menunjukkan bahwa sebaran kelompok telur di tiga kecamatan tidak berbeda nyata. Jumlah kelompok telur paling banyak didapatkan di Kecamatan Losarang, sementara itu parasitoid terbanyak ditemukan di Kecamatan Cikedung. Parasitoid yang ditemukan di tiga kecamatan yaitu Telenomus dignoides (Hymenoptera: Scelionidae), Telenomus dignus, Telenomus remus, Telenomus rowani, Trichogramma japonicum (Hymenoptera: Trichogrammatidae), dan ditemukan satu hiperparasitoid Cotesia sp. (Hymenoptera: Braconidae). Hasil penelitian ini diharapkan dapat berkontribusi dalam implementasi PHT di Indonesia., Rice plant is one of the main food crop commodities in Indonesia. One of the obstacles in increasing rice productivity is the attack of the yellow rice stem borer (Scirpophaga incertulas). This pest can attack rice plants on the vegetative and the generative phases causing loss of yield. This study aimed to determine the distribution of egg groups of the yellow rice stem borer and their parasitoids on rice in the districts of Losarang, Terisi, and Cikedung, Indramayu Regency, West Java. The study was conducted from December 2021 to February 2022. This study included collecting egg groups in nurseries and interviewing farmers and pesticide kiosk owners to determine the relationship between egg group distribution and the intensity of pesticide use. The results showed that the distribution of egg groups in the three sub-districts was not significantly different. The highest number of egg groups was in Losarang district, while the highest number of parasitoids was found in Cikedung district. The parasitoid species found in three sub-districts were Telenomus dignoides (Hymenoptera: Scelionidae), T. dignus, T. remus, T. rowani, Trichogramma japonicum (Hymenoptera: Trichogrammatidae), and one hyperparasitoid was found Cotesia sp. (Hymenoptera: Braconidae). This research results are expected to contribute in the implementation of IPM in Indonesia.
Keyword: generative phase, hyperparasitoid, kiosk, pesticides, vegetative phase

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