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Eddy Mahrub
Fakultas Pertanian Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry

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Struktur Komunitas Artropoda pada Ekosistem Padi Tanpa Perlakuan Pestisida Eddy Mahrub
Jurnal Perlindungan Tanaman Indonesia Vol 4, No 1 (1998)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.9836

Abstract

Generally, rice ecosystem was les stable because the structure of natural community often change, and it may cause decrease in the natural biodiversity. The research has been done in the lowland ricefield during wet and dry season without pesticides application. Observation was started when the plant (IR64) was 7 days old after transplanting with interval of 8 days until one week before harvest, to collect the arthropods from each samples. The objectives were to study the structure of community of arthropods during wet and dry season and to study food web chain in natural ecosystem and its implementation in the Integrated Pest Management Program. The results showed that in rice ecosystem four arthropod groups or guilds, was found i.e. Pests, Predators, Parasites and Neutral Arthropods. The diversity and species abundance of arthropods were high but the highest abundance of arthropods was found on the member of certain order and family only. The population of pest was lower than predator. The relative abundance of pests were 5.75% in wet season and 8.57% in dry season, while predators were 27.96% in wet season and 33.88% in dry season. The population density of spider predators especially Lycosa sp. during wet and dry season were very high. It was supported by the abundant of neutral arthropods as alternate prey when the pest population was very low. This condition may support negative feed back interaction and increase the potential of natural control in the absence of pesticide application.
Kajian Keanekaragaman Artropoda pada Lahan Padi Sawah Tanpa Pestisida dan Manfaatnya dalam Pengendalian Hama Terpadu Eddy Mahrub
Jurnal Perlindungan Tanaman Indonesia Vol 5, No 1 (1999)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.9963

Abstract

The objectives of the research are to study the diversity and abundance of arthropods, and to study the foodweb chain composition in the ricefield ecosystem without application of chemical pesticide. This research has been done in the ricefield at Klaten district, with IR64 rice cultivar. The observation was started when the plant was 7 days old after transplanting, with an interval of 8 days until one week before harvesting, to collect the arthropods samples. Three plots and 50 hills per plot were sampled weekly. Arthropods from each hill were collected by using insect sucking apparatus. The data was analyzed following Cheng method to study the arthropod index diversity and its abundance. The results showed that in the rice ecosystem there were four groups o arthropod consisted of pest (21.19%); predator (26.09%); parasitoid (0.42%), and neutral insect (52.30%). Data of the pest population was very low in free from chemical pesticide application, plot while population of neutral insect was very high. The high population of neutral insect was very useful and functionary as alternate prey for predator and parasitoid when the pest population was very low. The diversity index (H’) of arthropods during the rice growing period in the first to the fourth week increased from 1.38 to 2.37, but during the fifth to the eleventh week the diversity was about constantly low. The diversity index decreased linearly with the rice growth stage, but as the plant got older the population of arthropods decreased because the habitat became unfavourable. It might cause the diversity index and the abundance decreased. Some of the arthropods moved to new area to find the most suitable habitat. There was a foodweb chain in the rice ecosystem consisted of arthropods complex including the natural enemies and which were neutral insects. It indicated a good balanced condition between pest and natural enemies more profitable when no chemical pesticide intervention was applied in the ecosystem.
Pengaruh Jenis Mangsa dan Suhu pada Perkembangan Menochilus sexmaculatus Fabricius (Coleoptera: Coccinellidae) dan Peranannya dalam Pengendalian Diaphorina citri Kuwayama (Hemiptera: Psyllidae) Tris Haris Ramadhan; Y. Andi Trisyono; Eddy Mahrub; Arman Wijonarko; Siti Subandiyah; George Andrew Charles Beattie
Jurnal Perlindungan Tanaman Indonesia Vol 14, No 1 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (111.486 KB) | DOI: 10.22146/jpti.11874

Abstract

Diaphorina citri Kuwayama (Hemiptera: Psyllidae) is the vector of citrus greening (Huanglongbing) bacterium and the most serious impediment to citrus culture. Classical biological control of this psyllid vector should contribute to suppress their population. This research was conducted to determine the performance of Menochilus sexmaculatus Fabricius (Coleoptera: Coccinellidae) when they were fed with D. citri. The larval performance index of M. sexmaculatus on D. citri compared with Aphis craccivora Koch (Hemiptera: Aphididae) diet was 1.3.M. sexmaculatus fed with D. citri had lower fitness than those fed with A. craccivora as shown by longer larval stadium, lower adult dry weight, less number of egg produced and lower percentage of egg hatched. M. sexmaculatus grew best at the temperature of 27oC. Employing the exclusion procedure under field condition,M. sexmaculatus could reduce the population of D. citri up to 90%. These findings showed that theM. sexmaculatus could be a potential predator in reducing D. citri, particularly when the more preferred prey A. craccivora was not present.
Evaluasi Potensi Parasitoid Penggerek Pucuk Tebu, di Kabupaten Bantul Eddy Mahrub; Sri Ambarwati Amini; Nugrahaning Rahayu
Jurnal Perlindungan Tanaman Indonesia Vol 6, No 1 (2000)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12403

Abstract

The objective of the research is to evaluate the potency of sugar cane top borer parasitoids whether the parasitoids are available from the released individuals produced previously in the laboratory or other species naturally exist in the field. The result showed that Trichogramma sp. which have been released did not attack sugar cane top borer eggs. Tetrastichus schoenobii and Telenomus rowani observed in the field were seemingly replacing the role of Trichogramma sp. parasitoid previously released in the area. Both the T. schoenobii and T. rowani attacked the sugar cane top borer eggs with parasitism of 34.59% and 24.07% respectively. Larval parasitoids were Elasmus zehntneri, Rhaconotus scirpophagae, Stenobracon nicevillei and Allorhogas sp. while pupal parasitoid was Isotima javensis. Larval parasitism was 0-41.00% averagely. The most dominant parasitoid was R. scirpophagae with parasitism of 18.75% followed by E. zehntneri with parasitism of 17.25% respectively. Total parasitism by all species were 37.59% in young plant and 23.90% in old plant respectively. Pupal parasitism on young and old plants were 13.66% and 8.26% respectively. Those parasitoids were available in the field naturally and performed important potentiality in the natural control of sugar cane top borer. Those above mentioned parasitoids need to be conserved by preventing the ecosystem suffering from any hazardous changes, which may afflict negative effects to the natural enemies.
Specific Effects of Carbofuran on Rice Agrosystem in Yogyakarta Plant Growth and Rice Stem Borer Populations Eddy Mahrub; A. Pollet
Jurnal Perlindungan Tanaman Indonesia Vol 2, No 2 (1996)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpti.12883

Abstract

The effectiveness of carbofuran in controlling lowland rice stem borers in traditional farming systems was studied by looking at its impact on the whole rice agroecosystem. Levels of infestation, rice yield, damage to the plant, parasitism rates, and distribution of damage were compared after medium, high, and no (control) dosages were applied to lowland rice fields near Yogyakarta, Indonesia. Although larvae were found to be more numerous in control plots, the damage attributable to them was not significantly different. Their spatial distribution, however, differed radically. The authors concluded that carbofuran might affect pest populations at two different levels: by discouraging or preventing rice stem borers from laying their eggs on rice, and by delaying or eliminating natural enemies attacks on rice stem borers. Both levels were determined by comparing the distribution of damage in treated fields with untreated fields. In the treated fields, distributions of larvae seemed to reflect initial grouping of eggs, producing a random distribution of groups, while in the control fields larvae were found in random distribution of individuals.
Co-Authors A. Pollet Arman Wijonarko George Andrew Charles Beattie Nugrahaning Rahayu Sri Ambarwati Amini Subandi Tris Haris Ramadhan Y. Andi Trisyono