Judul: Pengelolaan Kebun dan Upaya Pengendalian Hama Ulat Jengkal (Hypiosidra talaca) dengan Aplikasi Hyposidra talaca Nucleopolyhedrovirus pada Tanaman Teh di PT Perkebunan .Nusantara VIII Gunung Mas Bogor, Jawa Barat.
Abstrak: The objectives of this study is to understand the management of plant maintenance of tea plantation at PT Perkebunan Nusantara VIII Gunung Mas and to propose an alternative pest control for tea looper (Hyposidra talaca) utilizing Hyposidra talaca Nucleopolyhedrovirus (HtNPV). The methods used were interviews, observation in the field, and the field efficacy test of HtNPV directly on tea plants. Tea plant maintenance activities include trimming, fertilizing, plucking, weed control, and pests-diseases management. Poor sanitary condition of tea plantation and the low human resources became limiting factors in the field. The most important pest at PT Perkebunan Nusantara VIII Gunung Mas is tea looper (Hyposidra talaca) that feed on tea shoots and may reduce production to more than 40%. Alternative control measure for H. talaca using HtNPV can be carried out by spraying HtNPV suspension. Effective application of HtNPV was applied twice per week and were able to reduce the population of H. talaca to more than 50% within 7 days, and can reduce the population up to 100% within 11 days.
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Judul: Biologi Hyposidra talacaWlk. pada Beberapa Jenis Tanaman di sekitar Perkebunan Teh Gunung Mas PTPN VIII Bogor
Abstrak: Hyposidra talaca is one of the most important pest in tea plantation and can cause significant yield losses. To effectively control the pest we need, the biology of H. talaca needs to be understood. This study aimed to determine the effect of tea, suren, sengon, cinnamon, and sintrong leaves on the biology of H. talaca. The insect were reared on different host plants and were observed for longevity, fecundity, fertility, mortality, and feed consumtion. The longevity of male H. talaca on tea, suren, sengon, cinnamon, and sintrong are 62.13, 63.68, 63.09, 62.23, and 46.46 days respectively and the longevity of females H. talaca on tea, suren, sengon, cinnamon, and sintong are 58.66, 59.21, 58.89, 57.37, and 31.89 days respectively. The fecundity of H. talaca on tea, suren, sengon, cinnamon, and sintrong are 2720.67, 1967.33, 1482.67, 2872.33, and 2009.33 eggs respectively, while the fertility H. talaca on tea, suren, sengon, cinnamon, and sintrong are 84.00, 84.67, 75.00, 90.67, and 86.33 % respectively. The average rate of mortality in the life cycles of H. talaca on tea, suren, sengon, cinnamon, and sintrong are 5.5, 10.56, 13.33, 15.55, and 10.01 % respectively. Average total feed consumption rate of larvae of H. talaca on tea, suren, sengon, cinnamon, and sintrong are 1.97, 0.98, 0.77, 2.29, and 1.32 g respectively.
Keyword: tea pest., alternative host, Hyposidra talaca

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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