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: 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: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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