Judul: Pengaruh Deterjen dalam Peluruhan Lilin dan Mortalitas Kutu Putih, Paracoccus marginatus (Hemiptera: Pseudococcidae)
Abstrak: Papaya mealybug, Paracoccus marginatus (Hemiptera: Pseudococcidae) is one of important pests that can decrease papaya production. An effective control effort to reduce the population of this insect pest is by using insecticides but the excessive and improper uses cause undesirable effect to human and environments. Moreover, detergents can be also used as control agents to this insect pest. The objective of this research was to study the role of detergent in controling the papaya mealybug. Detergents used in this experiment were powder detergent (a.i: sodium dodecyl benzene sulfonate), liquid detergent (a.i: sodium alkyl benzene sulfonate) and cream detergent (a.i: sodium alkylbenzene sulfonate). Each test detergent was sprayed to third instar nymph of P. marginatus with the detergent concentrations of 0.05%, 0.1%, 0.2% and control. Observation of decreasing wax layer was carried out at 1, 2, 3, 4 and 5 days after treatment. Two syntetic insecticides were used in this experiment; profenofos and deltamethrin. The same method was used in testing the syntetic insecticides, both single and the combination treatment of insecticide and liquid detergent. Insect mortality was assessed at 1, 2, 3, 4 and 5 days after treatment. Liquid detergent treatment showed higher activity in causing shed of wax layer than powder and cream detergents with the percentage for each treatment of 64%, 58%, and 48%, respectively.The average of insect mortalities on the treatments of combination of deltamethrin and detergent were higher than the treatment of combination of profenofos and detergents.
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Judul: Biologi perkembangan dan neraca hayati kutu putih pepaya, Paracoccus marginatus (Williams and Granara de Willink) (Hemiptera: Pseudococcidae) pada tiga jenis tumbuhan inang
Abstrak: The papaya mealybug, Paracoccus marginatus Williams & Granara de Willink (Hemiptera: Pseudococcidae), has been considered as a new invasive pest causing heavy damage on papaya in Indonesia since 2008. The pest is polyphagous with more than 55 host plant species. Study was conducted in laboratory with the objectives to determine developmental biology and life table parameters of the mealybug feeding on papaya, physic nut, and cassava leaves. Host plant species affected papaya mealybug performances. Egg stage lasted 7,25, 8,09, and 9,86 d on papaya, physic nut, and cassava, respectively. The shortest female nymphal developmental time was on papaya (18,91 d) and the longest on cassava (32,45 d). Longevity of adult males ranged from 1,09-2,85 d while females 12,29-14,93 d, respectively. When the mealybugs were reared on a seedling, the fecundity was higher on papaya (324,6) than those of physic nut (186,6) and cassava (157,5). No egg production occurred in virgin females. The sex ratio of P. marginatus favoured females, which comprised about 90% of population on papaya and cassava. The intrinsic rate of increase (rm) was significantly different among hosts, with the highest rate (0,117 female offspring/female/d) occured on papaya, followed by physic nut (0,079) and cassava (0,057). The maximum values of rm along with net reproductive rate (Ro) and finite rate of increase (λ), and the shortest mean generation time (T) and doubling time (DT) on papaya, indicating that papaya was the most favorable host plant for P. marginatus.
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Judul: Konstruksi Identitas Khalayak Melalui Simbol Signifikan Gerakan Sosial Baru (Studi Kasus Musik Rock Underground Tengkorak Band).
Abstrak: Bidang komunikasi pembangunan mengalami titik kritis terkait dengan perubahan struktur sosial, ekonomi, dan politik dalam skala global. Oleh karena itu, bidang ini harus mengalihkan perhatian, terutama dengan menggambarkan penemuan ilmu pengetahuan gerakan sosial baru dan mengkombinasikannya dengan area-area yang relevan dari komunikasi partisipatori untuk riset pembangunan. Musik rock underground, sebagai musik subkultur oposisi, merupakan manisfestasi dari gerakan sosial baru ketika simbolsimbol signifikan di dalamnya mampu memobilisasi hati dan pikiran audiensnya. Tujuan penelitian ini adalah untuk memahami sejauhmana kekuatan musik rock underground dalam membentuk identitas audiensnya serta memahami kondisi seperti apa yang mendukung lahirnya gerakan sosial baru ini.
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