Judul: Siklus hidup dan statistik demografi penggerek padi kuning (Scirpophaga incertulas) Walker (Lepidoptera: Pyralidae)
Abstrak: Penelitian bertujuan untuk mengetahui siklus hidup dan statistik demografi penggerek padi kuning Scirpophaga incertulas di rumah kaca. Penelitian dilaksanakan di rumah kaca, Jurusan. Hama dan. Penyakit Tumbuhan, Fakultas Pertanian, Institut Pertanian Bogor dan dimulai pada awal bulan Agustus sampai akhir Oktober 1989. Penelitian dilakukan dengan mengamati 20 kelompok telur yang masing-masing diletakkan dalam tabung plastik. Pengamatan stadium larva hingga imago dilakukan dengan menginfestasi 4 larva yang baru menetas ke tanaman padi yang berumur 3 minggu setelah tanam. Tanaman padi yang digunakan sebanyak 20 pot dan pengamatan dilakukan setiap hari hingga semua imago mati. Hasil pengamatan menunjukkan rata-rata lama stadium telur, larva, prapupa dan pupa, imago jantan dan betina masing-masing 7.00 hari, 22.19 hari, 13.98 hari, 5.74 ha- ri dan 5.50 hari. Laju reproduksi bersih (Ro) 24.9064, lama generasi (T) 44.2553 hari, laju pertumbuhan intrinsik (r) 0.0726, potensi berbiak (入) 1.0753, rata-rata laju kelahiran (B) 0.0946, laju kelahiran sesaat (b) 0.0913 dan kematian sesaat (d) adalah 0.0186.
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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: Modifikasi zeolit melalui interaksi dengan Fe(OH)3 untuk meningkatkan kapasitas tukar anion
Abstrak: Zeolite structure, that bears negative charge caused by replacement of Si with Al in the process of its formation, makes the zeolite has a function as cation exchanger and some anion exchange. To improve its anion exchange properties, zeolite can be modified by addition of Fe(OH)3. Fe3+ ions will enter empty cavities of the zeolite and bind the anions (ligands) to form complexes. Based on the esperiment, the modified zeolite with Fe(OH)3 can be made from both natural and active zeolites, increasing the anion exchange capacity of the zeolite. The anion exchange capacity of the modified zeolite was higher that of the zeolite before modification,i.e. 5.064 and 17.449 meq/100 g, respectively. Modification of zeolite with Fe(OH)3 inhibited adsorption of methylene blue, due to structural changes in the nature of the zeolite after modification. Zeolite adsorption capacity from methylene blue were the largest on the unmodified active zeolite, which was 0.7199 mg/g.
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