Judul: Population abundance, biology and management of pineapple Mealybug Dysmicoccus brevipes (Cockerell) (Hemiptera: Pseudococcidae) at Jalancagak district, Subang regency
Abstrak: Melybug Dysmicoccus brevipes (Cockrell) is an important pest of pineapple (Ananas comosus (Linn.) Merr.) with its role as vector of pineaplle mealybug wilt associated virus (PMWaV). This research stdy consist of pineapple farming by farmer, population abundance of D. brevipes on several areas, biology of mealybug on two host plants and mealybug management with three cultural practices. The research was conducted from March 2006 until June 2008.
Keyword: Mealybug, Dysmicoccus brevipes biology, Population abundance, Pineapple wilt disease, PMWaV, Cultural practice, Plant protection

Judul: Peranan strain pineapple mealybug wilt associated virusdan kutu putih dalam menginduksi gejala layu pada tanaman nanas
Abstrak: ARTA JUNITA HUTAHAYAN. The Role of Pineapple Mealybug Wiltassociated Virus Strain and Mealybug (Dysmicoccus spp.) in Inducing Wilt Symptom on Pineapple Plants. Dibimbing oleh GEDE SUASTIKA dan SOBIR Indonesia is a tropic country which have potential to produce exotic fruits like pineapple. Pineapple is very important fruit for world trade. Indonesia is the third largest pineapple tin exporter after Philippine and Thailand. The main problem in pineapple cultivation is wilt disease. Mealybug wilt of pineapple (MWP) is currently present in pineapple-growing areas of West Java, Indonesia. MWP is characterized by severe tip dieback, downward curling, reddening, and wilting of the leaves which can lead to total collapse of the plant. Mealybug feeding on the pineapple plant has been associated with MWP symptom. Furthermore, flexuous rod-shaped virus particles, designated Pineapple mealybug wilt-associated virus (PMWaV) have been isolated from both symptomatic and asymptomatic pineapple plants. PMWaV is actually a complex of at least two different viruses, PMWaV-1 and PMWaV-2 that are transmitted by mealybug. The objectives of this research are to study the role of PMWaV isolates infection and mealybug feeding in inducing wilt symptom on pineapple plants, and to study the incidence of MWP in pineapple-growing areas of Indonesia. Survey for MWP were conducted in pineapple production areas of East Java (Blitar), West Java (Subang and Bogor), and North Sumatera (Simalungun). The incidence of the disease in all of the areas surveyed were found to be ranging from 50% to 90%. These results indicated that MWP has already spread widely in pineapple-growing areas of Indonesia. Transmission of PMWaV from infected pineapple plant to the pineapple test plants using mealybugs Dysmicoccus spp. under greenhouse condition were successfully conducted. The symptoms on the test plants were the same as that on naturally infected plants. The plants inoculated with virus and colonized by mealybug produce more severe symptoms than the plants inoculated with virus only. This indicated that PMWaV infection and mealybug feeding play important role in inducing wilt symptom. But, some pineapple plants surveyed on the field showing MWP symptoms without colonized by mealybug. This finding suggested that PMWaV likely to be the most important causal agent of the MWP, and mealybug feeding making the symptom more severe.
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Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4