Judul: SURVEY OF DISTRIBUTION OF BROWN PLANTHOPPER POPULATION IN RICE CROPS IN SUBANG REGENCY WEST JAVA
Abstrak: Padi (Oryza sativa L.) merupakan komoditas penting sebagai sumber pangan pokok di Indonesia. Budidaya tanaman padi seringkali mengalami kegagalan akibat serangan hama wereng batang cokelat (WBC) Nilaparvata lugens Stål. Penelitian ini bertujuan mengetahui persebaran populasi WBC di Kabupaten Subang, kerapatan populasinya, dan tingkat kerusakan tanaman padi di tiga lokasi ketinggian tempat yang berbeda. Penelitian ini dilakukan dengan menelusuri keberadaan serangan WBC di lahan persawahan di areal kabupaten Subang dan memetakan persebarannya, menentukan lahan perlakuan terinfestasi di tiga lokasi ketinggian tempat berbeda, mengamati tingkat kerusakan tanaman pada umur 4 MST dan kerapatan populasi WBC. Data penunjang diperoleh melalui wawancara terhadap petani tentang teknik budidaya padi setempat kaitannya dengan pengendalian WBC di lahannya. Luas serangan dan intensitas kerusakan tanaman tertinggi 91,5% dan 41%, dengan jumlah populasi WBC tertinggi 1.8 ekor/rumpun ditemukan di lahan padi dataran rendah pada ketinggian 27-38 m dpl, sebaliknya kerusakan paling rendah sebesar 22% dan 4.3% dengan jumlah populasi 0.35 ekor/rumpun ditemukan di dataran tinggi pada 516-526 m dpl. Penggunaan varietas padi Ciherang dan Inpari 31 tidak berpengaruh terhadap jumlah populasi WBC. Lokasi penanaman padi di dataran rendah dengan curah hujan dan suhu lingkungan yang tinggi berkontribusi dalam peningkatan populasi WBC, Rice (Oryza sativa L.) is an important commodity as the staple food in Indonesia. Rice cultivation often fails due to attacks by the brown planthopper (BPH) Nilaparvata lugens Stål. This study aims to determine the distribution of BPH population in Subang Regency, the population density, and the level of damage to rice crops at three different altitude locations. This research was conducted by tracing the presence of BPH infestation in paddy fields in the Subang district area and mapping their distribution, determining the infested treatment areas at three different altitude locations, observing the level of plant damage at 4 WAP and the population density of BPH. Supporting data was obtained through interviews with farmers regarding local rice cultivation techniques in relation to BPH control in their fields. The highest attack area and intensity of crop damage were 91.5% and 41%, with the highest number of BPH populations of 1.8 individuals/hills found in lowland rice fields at an altitude of 27-38 masl, whereas the lowest damage was 22% and 4.3% with the lowest populations of 0.35 individuals/hills found in the highlands at 516-526 masl. Ciherang and Inpari 31 rice varieties had no effect on the number of WBC populations. The location of rice cultivation in the lowlands with high rainfall and ambient temperature contributed to the increase in the BPH population.
Keyword: Intensitas, Ketinggian tempat, Luas serangan, Varietas padi, Altitude, Attack area, Intensity, Rice varieties

Judul: Infestation Level of the Yellow Rice Stem Borer, (Scirpophaga incertulas) and its Parasitizing Level of Egg Parasitoid in Pacet  Subdistrict, Bandung Regency
Abstrak: Produksi padi di Indonesia setiap tahun mengalami penurunan yang salah satunya diakibatkan oleh organisme pengganggu tanaman (OPT). Penggerek batang padi merupakan salah satu OPT yang seringkali menyebabkan penurunan hasil terutama di Provinsi Jawa Barat. Aplikasi insektisida merupakan salah satu upaya yang seringkali dilakukan oleh petani. Akan tetapi, penggunaan insektisida secara berlebihan dapat menimbulkan berbagai efek negatif baik terhadap lingkungan maupun konsumen. Oleh karena itu, diperlukan penerapan konsep pengendalian hama secara terpadu (PHT). Salah satu upaya tersebut adalah dengan pemanfaatan musuh alami, yaitu parasitoid telur. Keberadaan hama maupun musuh alami sangat terpengaruh oleh lingkungan salah satunya ketinggian. Oleh karena itu penelitian dilaksanakan dengan tujuan memperoleh informasi mengenai intensitas serangan dan penyebaran populasi masing-masing parasitoid telur pada ketinggian 800 m dpl dan >1000 m dpl. Pengamatan dilakukan di Desa Pangauban dengan ketinggian 1087 m dpl dan Desa Tanjungwangi dengan ketinggian 866 m dpl, yang terletak di Kecamatan Pacet, Kabupaten Bandung. Ditentukan lahan pengamatan dari masing-masing lokasi, terdiri atas lahan pengambilan sampel kelompok telur dan lahan pengamatan kerusakan tanaman oleh penggerek batang padi kuning (PBPK). Setiap lokasi pengamatan ditentukan 5 petak yang memiliki ukuran 5 m 5 m dengan metode diagonal satu arah. Pengamatan dilakukan secara langsung dengan menghitung intensitas serangan pada 10 rumpun di masing-masing petak sebanyak 4 kali masa pengamatan. Kemudian dilakukan pengambilan kelompok telur setiap 2 minggu sekalisebanyak 4 kali pada lahan seluas 2 ha yang dibagi menjadi 4 bagian. Hasil penelitian ini menunjukkan bahwa faktor lingkungan serta cara budi daya dapat memengaruhi intensitas serangan penggerek pada pengamatan 4 dan 6 minggu setelah tanam (MST). Faktor lingkungan juga memengaruhi spesies parasitoid yang ditemukan selama penelitian., Rice production in Indonesia has decreased every year, one of which is due to the presence of plant pest organisms (PPO). Rice stem borer is one of the pests that often causes a decrease in yield, especially in West Java Province. The application of insecticides is one of the efforts that are often carried out by farmers. However, excessive use of insecticides can cause various negative effects on both the environment and consumers. Therefore, it is necessary to apply the concept of integrated pest management (IPM). One of these efforts is the use of natural enemies, namely egg parasitoids. The presence of pests and natural enemies is greatly affected by the environment, one of which is altitude. Therefore, the research was carried out to obtain information about the intensity of attack and population distribution of each egg parasitoid at an altitude of 800 m asl and > 1000 m asl. Observations were made in Pangauban Village with an altitude of 1087 m asl and Tanjungwangi Village with an altitude of 866 m asl, which are located in Pacet District, Bandung Regency. The observation area was determined from each location, consisting of an egg group sampling area and observation area for plant damage by the yellow rice stem borer (YRSB). Each observation location was determined by 5 plots with a size of 5 m × 5 m using the one-way diagonal method. Observations were made directly by calculating the intensity of the attack on 10 clumps in each
Keyword: altitude, infestation levels, egg parasitoids, paddy

Judul: Membran Komposit Kitosan-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Direct methanol fuel cell (DMFC) is a fuel cell that utilize methanol as the fuel source. The electrolyte membrane used in the DMFC system in this research was chitosan-zeolite composite membrane. The composite membrane was synthesized with chitosan-zeolite composition variation of 1:1, 1:2, 1:3, and 2:1. The membranes were analyzed by Fourier transform infrared spectrophotometer (FTIR) and scanning electron microscope, and for the specific gravity. Membrane performances were tested with methanol uptake, methanol permeability, conductivity, and potential difference in the DMFC system. The FTIR spectrum showed no formation of new functional groups inducating that the composite membrane was a result of physical mixing. Morphological analysis showed that the membrane was nonporous. Chitosan-zeolite 1:3 composite membrane had the highest specific gravity and methanol uptake, 1.4226 g/mL and 41.44%, respectively. The highest proton conductivity was showed by the 1:2 chitosanzeolite composite membrane, namely 7.2946× 10-7 S/cm. Based on this research results, chitosan-zeolite composite membrane can be applied in DMFC system.
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