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All Journal AGROEKOTEKNOLOGI AGRIVITA, Journal of Agricultural Science
marheni marheni
university of sumatera utara
Agriculture, Biological Sciences & Forestry

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Indeks Keanekaragaman Arthopoda pada Pertanaman Padi (Oryza sativa L.) di Lapangan Dian Mustika Putri; Marheni Marheni; Fatimah Zahara
Jurnal Agroekoteknologi Vol 6, No 1, Januari (2018)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (686.852 KB) | DOI: 10.32734/jaet.v6i1, Januari.17009

Abstract

Penelitian ini bertujuan untuk mengetahui keanekaragaman arthopoda pada tanaman padi fase vegetatif dan fase generatif, dan untuk mengetahui hama dan musuh alami pada tanaman padi. Penelitian dilaksanakan di Balai Benih Induk Tanjung Morawa dan di Laboratorium Hama Fakultas Pertanian Universitas Sumatera Utara, Medan dari Mei 2015 sampai dengan Agustus 2015. Penelitian ini menggunakan metode purposive sampling. Hasil penelitian menunjukkan serangga yang tertangkap pada perangkap yellow trap pada fase vegetatif adalah 8 ordo yang terdiri dari 27 famili dengan jumlah populasi serangga sebanyak 377, nilai Kerapatan Mutlak (KM) yang tertinggi terdapat pada ordo Coleoptera (Coccinelidae) yaitu sebanyak 27 dengan nilai Kerapatan Relatif (KR) sebesar 7,09%. Sedangkan KM terendah terdapat pada ordo Odonata (Libellulidae) yaitu sebanyak 5 dengan nilai KR 1,31%. Sedangkan fase generatif adalah sebanyak 8 ordo yang terdiri dari 31 famili, dengan jumlah populasi sebanyak 1040. Nilai KM yang tertinggi terdapat pada ordo Coleoptera (Carabidae) yaitu sebanyak 145 dengan nilai KR 13,94 %. Sedangkan KM terendah terdapat pada ordo Coleoptera (Tenebrionidae) yaitu sebanyak 13 dengan nilai KR 1,25%. Nilai indeks keanekaragaman (H’) pada fase vegetatif sebesar 2,640177 dan memiliki biodiversitas sedang. Nilai Indeks Keanekaragaman Generatif (H’) sebesar 3,06409 dan memiliki biodiversitas stabil.Kata kunci: keanekaragaman, generatif, serangga, vegetatif
Exploration of Symbiotic Bacteria of Oryctes rhinoceros (Coleoptera: Scarabaeidae) Larvae from Oil Palm Empty Fruit Bunches Marheni Marheni; Edhi Martono; Octanina Sari Sijabat
AGRIVITA, Journal of Agricultural Science Vol 43, No 1 (2021)
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v43i1.2301

Abstract

Oil palm empty fruit bunches (OPEFB) were utilized as the source of organic fertilizer, but become a medium of Oryctes rhinoceros proliferation in oil palm plantations. O. rhinoceros uses cellulose, hemicellulose and lignin in the OPEFB as energy sources for larvae growth and development. In the process of breaking and combining complex compounds into simple molecules, they are establishing symbiotic relationship with bacteria residing in the digestive tract of O. rhinoceros larvae. Isolation of the symbiotic bacteria of the O. rhinoceros larvae was carried out with the aim of identifying bacteria in the digestive tract of the third instar found in the OPEFB. This research was done by using a descriptive method. Exploration of symbiotic bacteria of O. rhinoceros larvae was conducted through two stages. The first step was attained by isolating, growing and multiplying the bacteria and conducting biochemical testing. The second phase was accomplished by molecular testing for bacterial identification. The results showed that bacterial isolates were found and and after molecularly sequenced based on 6S rDNA, the species were identified as Bacillus stratosphericus, B. siamensis, B. cereus, Haemophilus parainfluenzae, Achromobacter xylosoxidans, and Alcaligenes faecalis. The research also found several species of bacteria originating from the hindgut larvae O. rhinoceros.
Co-Authors Dian Mustika Putri Edhi Martono Fatimah Zahara Octanina Sari Sijabat pebi nurhandani Safni, Irda Setia Sari Girsang