Keefektivan Beauveria Bassiana (Bals.) Vuill. Isolat Indigenous Pagaralam Sumatera Selatan Pada Media Beras Terhadap Larva Plutella Xylostella Linn. (Lepidoptera: Yponomeutidae)

The objective of study was to investigate the effectiveness of Beauveria bassiana isolate cultured in half-ripe rice media against third-instar larvae of Plutella xylostella. The research used 10 isolates consisted of 4 isolates that were originnally collected from Pagaralam i.e. PD1 (isolated from P. xylostella cadaver), PD2, PD8, PD9B (from Crysodeixis chalcites cadaver), and 6 isolates from other areas as comparison, i.e. CCW3 (from Crysodeixis chalcites cadaver), BBL (from Hypothenemus hampei cadaver), CH (from Conomorpha cramerella cadaver), CPJW (from H. hampei cadavi), WC (from Nilaparvata lugens cadaver), and WSJT (from Leptocorixa acuta cadaver). The parameters that were measured were mortality of larvae, time of death and behaviour of larvae after application. Result of the test showed that B. bassiana isolated from L. acuta (WSJT isolate) caused the highest mortality i.e. 73.34 %, with the highest spore density 5.6x107 spore ml-1 (in half-rice media) and 3.0x107 spore ml-1 (GYA media). The lowest LT50 was 19.27 hours, and was obtained from the application of PD9B. After application of B. bassiana, the behaviour of larvae was slightly change from a healthy one to less in consuming of food and then die

Kelimpahan Arthropoda Karnivora di Pertanaman Padi Ratun di Sawah Lebak yang Diaplikasikan Bioinsektisida Bacillus Thuringiensis

Kelimpahan Arthropoda karnivora di pertanaman padi ratun di sawah lebak yang diaplikasikan bioinsektisida Bacillus thuringiensis telah dilakukan di sawah lebak Pemulutan, Ogan Ilir Sumatera Selatan selama Agustus-Oktober 2013. Penelitian bertujuan untuk mengetahui kelimpahan Arthropoda karnivora padi ratun yang diberi aplikasi Bacillus thurngiensis dan tanpa diberi aplikasi bioinsektisida. Pengambilan sampel spesies Arthropoda dilakukan dengan menggunakan jaring serangga pada tajuk tanaman padi dan pitfall trap untuk serangga tanah. Keanekaragaman Arthropoda dihitung menggunakan Indeks Keanekaragaman Shannon, Indeks Dominasi Berger-Parker dan Indeks Kemerataan. Hasil penelitian menunjukkan bahwa kelimpahan populasi Arthropoda karnivora didominasi famili Tetragnatidae, Coccinalidae, Lycosidae dan Carabidae

Perbandingan Efek Pemberian Bioinsektisida dan Ekstrak Kompos terhadap Produksi Padi Ratun dan Populasi Serangga Hama

The advantages of ratooning rice are to save water, cost production, labor, preparation time for planting and harvesting, but the ratooning productivity is still low. This research aimed to study the effect of the bioinsecticide and compost extract on ratooning rice production and insect populations. The ratooning rice was applied by bioinsecticide, compost extract, and combination of bioinsecticide and compost extract with dose 2 L ha-1 per application, respectively. Data of agronomic variables were statistically analyzed using analysis of variance, whereas insect pest population data were analyzed using Chi Square test. The seedling height of ratoon applied by compost extract was the highest among treatments. The number of productive tillers per clumps and rice production on plot applied by compost extract were higher than the insecticide treatment. At the age of 17 day-ratooning rice, application bioinsecticide reduced the population of insect pests, such as Ciccadulina bipunctata, Recilia dorsalis, Nilaparvata lugens, and Nephotettix nigropictus. Thus, application of compost extract tended to improved the growth and production of the ratooning rice, while the bioinsecticide decreased the insect pest population

Kelimpahan Dan Keanekaragaman Spesies Serangga Predator Dan Parasitoid Aphis Gossypii Di Sumatera Selatan

This study was aimed to analysis abundance and species diversity of predatory insects and parasitoid of Aphis gossypii from lowland and highland areas of South Sumatra. Survey of was conducted in 11 vegetable centers of South Sumatra. The results showed that 20 species of predatory insects and 3 species of parasitoids were found from the survey. The predatory insects consisted of 15 species of coccinellid beetles, two species of syrphids, and one species of chamaemyiid, mantid and staphylinid. Parasitoid found were 2 species of Aphidiidae (Diaretiella rapae and Aphidius sp.) and a species of Aphelinidae (Aphelinus sp.). The highest abundance of the predator was found in Soak (42.61 larvae and adults) and the highest abundance of the parasitoid was found in Talang Buruk (25.99 adults). The highest species diversity of the predator and the parasitoid were found in Soak (15 species and H'= 0.94) and in Talang Buruk (2 species and H' = 0.27), respectively. Abundance and species diversity of the predators and parasitoids were higher in the dry season than those in rainy season. Thus, the abundance and species diversity of the predators and parasiotids were higher in the lowland than highland areas in South Sumatra, while the seasons affected the abundance and species diversity of the predators and parasitoids

Struktur Komunitas Laba-laba Di Ekosistem Padi Ratun: Pengaruh Aplikasi Beauveria Bassiana (Balsamo)

Spiders are the main predators in paddy ecosystem. Application of entomopathogenic fungus, such as Beauveria bassiana (Balsamo) is not expected to have any negative effect on spiders in the paddy field. This research was aimed to compare species composition, abundance, and species richness of spiders in ratoon paddy. The research was done on three hectares of rice fields that were treated with the following treatment, (i) 2 L/ha/application of liquid B. bassiana, (ii) 2 L/ha/application compost extract (without liquid B. bassiana), and (iii) a combination of liquid B. bassiana and compost extract with each using the same 2L/ha/application dose. The result of this research showed that B. bassiana bioinsecticide application did not affect the abundance and species richness of spiders in ratoon paddy. The treatments did not significantly affect species richness and abundance of the canopy-inhabiting spiders. The species richness and abundance of the soil-dwelling spiders on the paddy field applied by the bioinsecticide was not different from those without the bioinsecticide. The treatments did not effect species composition of the canopy-inhabiting and the soil-dwelling spiders. Application of B. bassiana bioinsecticide was not harmful for the spiders in the rice field

Perbandingan Keanekaragaman Spesies dan Kelimpahan Arthropoda Predator Penghuni Tanah di Sawah Lebak yang Diaplikasi dan Tanpa Aplikasi Insektisida

Species Diversity and Abundance Comparison of the Soil-dwelling predatory-arthropods Inhabiting Fields Applied by Insecticide and without Insecticide Application. Studies on soil-dwelling predatory arthropods were carried out in lowland areas of South Sumatra, with objectives to analyze the species diversity and abundance of the predatoryarthropods inhabiting fields applied by synthetic insecticide, bioinsecticide, and without insecticide application. The predatory arthropods were sampled using pitfall traps. Indices of diversity and community similarities were applied to analyze the data. Results indicated that the arthropods inhabiting field without insecticide application had the highest diversity and abundance compared to other treatments. Predatory community similarities between those on the field without insecticide application and applied by bioinsecticide were higher compared to the fields applied by synthetic insecticide. KEY WORDS: diversity, abundance, predatory arthropod

Artropoda Predator Penghuni Ekosistem Persawahan Di Daerah Cianjur, Jawa Barat

Predatory arthropods inhabiting paddy rice ecosystems in Cianjur District, West Java. Predatory arthropods were surveyed in Cianjur District, West Java from July to November 1997, with objectives to observe the species of predatory arthropods inhabiting the ecosystems. Canopy-inhabiting and soil-dwelling arthropods were sampled using D-vac and pitfall traps, respectively. Results indicated that insecta and Arachnida were the most abundant predators in the ecosystem, with the total of 142 species. Predatory insects were dominated by Carabidae (27 species), and Staphylinidae (13 species) and spiders were dominated by Therididae (9 species), and Lycosidae (8 species). Thus, predatory-arthropods inhabiting the sawah ecosystems were very diverse