Judul: Kisaran inang dan tingkat kerusakan akibat serangan kutukebul Aleurodicus dugesii Cockerell (Hemiptera: Aleyrodidae) pada tanaman hortikultura di Kecamatan Cisarua (Bogor) dan Kecamatan Cipanas (Cianjur)
Abstrak: Aleurodicus dugesii Cockerell (Hemiptera: Aleyrodidae) is a polyphagous whitefly which attacks more than 43 plant genera in 35 families (Lasalle et al. 1997). The whitefly sucks on plant sap, extracting important nutrients that lead to defoliation, stunting and plant death. Information about host range, population density, level of damage and yield loss is necessary to control this pest. Study of the host range, population density, level of damage to horticultural crops and yield loss were done in two Sub-districts Cisarua (Bogor) and Cipanas (Cianjur). The research method consisted of gathering information from relevant agencies and field observations. Results of the study revealed that the number of horticultural crops attacked by A. dugesii in two sub-districts were 36 species consists of 23 families. A dominant host plant species were family of Fabaceae, Solanaceae and Euphorbiaceae. The highest population of whitefly on horticultural plants were 1 986 per leaf on tamarillo in Sub-districts Cipanas (Cianjur). The level of damage in the range of 1 – 80%. Economic losses due to A. dugesii on avocado plants in the village of Citeko was Rp. 40 290 000,- per year.
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Judul: Keanekaragaman spesies dan kunci identifikasi kutukebul (Hemiptera: Aleyrodidae) pada tanaman pertanian di Jawa Barat
Abstrak: Whiteflies are one of the most important insect group of pests in agricultural crops which can cause direct and indirect damages to plants, i.e. disturb photosynthesis and plant aesthetics, and transmit plant viruses. Whiteflies have been reported in Indonesia since 1900’s. There are 37 whiteflies species that have been recorded in Indonesia, but it is believed that many more are unidentified. The aims of this research was to identify the whiteflies species in agricultural crops and study their diversity at different altitudes. Whiteflies were collected at five areas in West Java: Bogor, Cianjur, Sukabumi, Bandung, and Garut. The identification of whiteflies were using fourth instar nymph or known as pupa. Slide preparation followed Watson’s protocol that has been modified. Morphological characters for such species were recorded for identification. Identification key was constructed in the dichotomous and digital forms using Lucid Phoenix Key program. Diversity of whiteflies was analysed using Shannons’s (H’), Simpson’s (D) and Sorenson’s (C) diversity index. Whitefly natural enemies that were found in the field or parasitized whiteflies were identified. There were 38 whiteflies species found and 10 were still unidentified. About 89.5% whiteflies found were the member of subfamily Aleyrodinae. Whiteflies were more commonly found in the plants with complex architecture (fruit trees) than the plants with simple architecture (vegetables, ornamental plants, etc). Plant with complex architecture can provide more space and food for organism to live. Aleurodicus dispersus and Aleurodicus dugesii are cosmopolitan species that can be found in various types of plants and altitudes. Bemisia tabaci was commonly found in lower altitude, whereas Trialeurodes vaporariorum was mainly found in higher altitude. Both species are become important pests in vegetable crops and transmit plant diseases. The highest whitefly species richness and diversity was found in lowland (0-500 m above sea level (asl)) (H’=2.14; 1- D=5.53). Similarity analysis (C) showed that number of whitefly species found at lowland was 64% similar to midland (501-1000 m asl). The natural enemies that commonly found were coccinellid beetle, aphelinid, and encyrtid wasp.
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Judul: Formulasi Hamiltonian untuk Menggambarkan Gerak Gelombang Soliter Dimensi Tiga di Permukaan Laut
Abstrak: Gelombang permukaan adalah gelombang yang terjadi perbedaan rapat massa antara air dan udara. Salah satu gelombang permukaan yang ditinjau adalah gelombang soliter. Formulasi gelombang soliter dilakukan dengan menggunakan formulasi Hamiltonian.
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