Judul: Dinamika Populasi Ulat Jengkal (Hypiosidra talaca) pada Tanaman Teh di PTP .Nusantara VIII Gunung Mas Bogor, Jawa Barat.
Abstrak: This study was conducted to determine the abundance of the population of Hyposidra talaca at PTP Nusantara VIII Gunung Mas. Hyposidra talaca is an important pest in tea plantations, because it could decrease the production of tea. Hyposidra talaca generally attacks young leaves and shoots, severe investation of this pest can cause heavy defoliation of leaves and shoots of the plant. The method used was direct observation in the field by observing the population Hyposidra talaca. Prior to this study a survey was conducted to ditermine the sites. The difference in Hyposidra talaca populutaion dynamics between two sites was studied. The population dynamics of these pests were recorded 8 times on each site. Nucleopolyhedrosis virus infected Hyposidra talaca were collected in the plastic cup. Infected larvae usually become soft and prior to death they climb to the top and hang on the tea leaves in an inverted V shape position. Dead larvae caused by other factors usually found in dry condition. The presence of other insects were observed and recorded and was collected using insect nets.
Keyword: Nucleopolyhedrosis virus (NPV), Hyposidra talaca, tea

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: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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