Judul: Eksplorasi Cendawan Entomophthorales dan nematoda pada trips dan kutudaun pada tanaman mawar dan krisan di Balai Penelitian Tanaman Hias Kabupaten Cianjur
Abstrak: Rose and chrysanthemum are two of the ornamental plants that have a high economic value in Indonesia. Thrips and aphid are important pests of these plants. Entomophthoralean fungus and nematode are potential biological control agents of thrips and aphid. There are no many reports of this fungus in Indonesia. The objective of this research was to explore Entomophthoralean fungus and nematode on both thrips and aphids at both roses and chrysanthemums in Indonesian Ornamental Crops Research Institute (Balithi). The research was conducted from March 2012 to June 2012. Thrips and aphids were sampled from three blocks for each plant. Numbers of sampled plants for each block were 10 plants selected randomly. Thrips were sampled at one flower on each plant. Both thrips and aphid samples were put on alcohol 70% for the next experiment. Microscope slide squash mounts in lactophenol cotton blue were made for both thrips and aphids and each sampled insect was examined with a microscope to determine if secondary conidia, hyphal bodies, primary conidia, conidiophores, and resting spores were present. Primary conida, secondary conidia, and hyphal bodies are development stages of fungus were found in thrips. Primary conidia, conidiophores and hyphal bodies were found in aphid. Thrips populations on rose and chrysanthemum were not significantly different. However, fungus infection levels on thrips and aphid showed significant differences. During examination, nematodes were found in thrips on both roses and chrysanthemums. Nematode infection levels in thrips on roses were higher than those on chrysanthemums.
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Judul: Survei Trips dan Cendawan Entomopatogen pada Tanaman Krisan di Perusahaan Bunga Potong Natalia Nursery
Abstrak: Thrips have been considered as one of important pests on high economical valued plants, such as ornamental plants, fruits, and vegetables. One of species thrips that attack chrysanthemum was Trips parvispinus. Thrips cause damage to the affected plants. One of the natural enemies for thrips is entomopathogenic fungi. This study aims was to determine species diversity and population thrips on chrysanthemum plants, as well as the presence of entomopathogenic fungi. Thrips populations on flower were counted by tapping at top part of flowers on the white trays. Sampled thrips were put on 70% alcohol on eppendorf tube. Squash mounted microscope were made to determine entomophthoralean fungi on thrips. Thrips species which found were Frankliniella intonsa and Thrips parvispinus. Fungus infected thrips were founded during observation.
Keyword: identification, flower, Alcohol

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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