scholarly journals Host Diversity of Beauveria bassiana (Balsamo) Vuillemin in Rice Field in Bolaang Mongondow Regency

Akta Agrosia ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 63-69
Author(s):  
Parluhutan Siahaan ◽  
Saroyo Saroyo ◽  
Marnix L.D. Langoy ◽  
Arie J. Saimima

Beauveria bassiana can attack a variety of hosts and their virulence can vary at each host and location. Exploration of the diversity of hosts B. bassiana from local isolates needs to be done as initial information that can explain the ability of B. bassiana in infecting insects. Sampling locations were selected in three district, each district selected three stations and each station consisted of 10 plots. The location of sampling is determined by the purposive random sampling method. Each station was made a plot measuring 1m x 1m and distributed randomly. Every insect infected with B. bassiana was taken and taken to a laboratory for identification. The results showed that there were five insects that hosted B. bassiana, namely Nilaparvata lugens, Scotinophara coarctata, Leptocorisa oratorius, Nezara viridula and Paraeucosmetus pallicornis. The highest host diversity index was found in North Dumoga with a value of 1.47. The highest abundance index was found in N. lugens host in East Dumoga with a value of 43%. The highest density was found in the host N. lugens in Central Dumoga with a value of 1.93 ind / m2. There were indications of differences in virulence of the  B. bassiana local isolates that were influenced by the spesies of host and location Keywords: Beauveria bassiana, diversity,  Bolaang Mogondow Regency, diversity and abundance indices

Author(s):  
Riskawati Nento ◽  
Hasim Hasim ◽  
Ramli Ramli

Ponelo Islands is an important area to be developed with the economic potential of fisheries and marine resources. This research was conducted in May-September 2019 aimed to find out Ecological Parameters as the Basis of Bivalvia Management in Seagrass Ecosystems. The sampling method is done by using the method used in determining the observation point is the linear quadratic transect method with sampling bivalves determined intentionally with a systematic perpendicular direction using a transect measuring 1x1 m. All bivalves contained in transects / quadrants are counted and identified. The sampling locations were divided into 4 (four) stations, namely Station I (Otiola Village), Station II (Ponelo Village), Station III (Malambe Village), and Station IV (Tihengo Village). Observations at the study site found several types of seagrass ecosystems including Enhalus acoroides, Halodule pinifolia, Thalassia hemprichii, and Cymodocea raotundata. Furthermore, 8 (eight) types of bivalves were found which were divided into 4 (four) stations in Ponelo Islands, namely Isognomon isognomum, Pinna muricata, Semele crenulata, Tellina virgata, Trachycardium subrugosum, Spondylus tenellus, Tapes sulcarius, Anadara pilula. The highest abundance index value is Tellina virgata found in Otiola Village with a value of 77.78%. The dominance index value for the highest is in Ponelo Village with a value of 0.88 in the high category. diversity index (D') with a value of 0.63 found in the medium category Malambe village. Keywords: Bivalvia, Seagrass, Abundance, Dominance, Diversity


2020 ◽  
Vol 4 (1) ◽  
pp. 76-85
Author(s):  
Fri Maulina ◽  
Novri Nelly ◽  
Hidrayani Hidrayani ◽  
Hasmiandy Hamid

The species of egg parasitoid in rice bug is necessary to know to be used as biological agent in the field. The research aimed to determine spesies of parasitoid, diversity index, parasitization level and parasitoid mortality which found in rice bug eggs in rice fields in West Sumatra. Purposive random sampling was used in this research for determining the sampling locations. Collecting eggs sampling was conducted for 1 km along transect line in sampling location. The collected eggs of 12 sampling locations then observed and identified in Laboratory of Insect Bioecology, Faculty of Agriculture, Andalas University. The result showed that the kind of egg parasitoid  found in the field were Hadronotus leptocorisae  and  Ooencyrtus malayensis with each parasitization level were 22.3 ± 11.1 %  and 4.2 ± 5.3 %, each the mortality were 57.8 ± 26.4% and 30.6 ± 37%, the diversity of egg parasitoid was low with the index 0.3858 Based on Shannon-Wienner.


2013 ◽  
Vol 14 (3) ◽  
pp. 176 ◽  
Author(s):  
Trizelia Trizelia ◽  
Teguh Santoso ◽  
Soemartono Sosromarsono ◽  
Aunu Rauf ◽  
Lisdar I Sudirman

The objectives of the research were to study the genetic variability of various Beauveria bassiana (Bals.) Vuill. isolates andvirulence to Crocidolomia pavonana. Thirteen isolates of B. bassiana were isolated from Nilaparvata lugens (Stål),Leptocorisa oratorius (F.), Thrips sp., Hypothenemus hampei (Ferr.), Crocidolomia pavonana (F.), Spodoptera litura (F.),Chrysodeixis chalcites (Esp.), and Riptortus linearis (L.) pests from different geographical locations in Indonesia. Fourteendifferent random primers were used to amplify DNA. Clustering of isolates were obtained using Unweight Pair GroupMethod Avarage (UPGMA). The results showed that only OPA08 primer generated more polymorphic DNA fragments.Result of clustering analysis showed that B. bassiana isolates forms two groups having genetic similarity equal to 55%.Clustering of isolates does not correlate to host type nor geographic origin. Mortality of second instar C. pavonana larvaewas dependent on the fungal isolates. At a concentration of 108 conidia/ml, isolate Bb-La2 had the highest virulence whichcaused 65% mortality of 2nd instar larvae. Isolates of B. bassiana is virulent against C. pavonana larvae present in the samegenotype group.


2020 ◽  
Vol 21 (2) ◽  
pp. 131-138
Author(s):  
Fatma Suryani Harahap ◽  
Adi Syaputra

The presence of heavy metals in waters can be sourced from mining, household, agricultural waste and industrial wastes. Some heavy metals are toxic such as Cu, Hg, and Pb can accumulate in aquatic sediments. Sediments that are contaminated with heavy metals will endanger the organisms that live in them. This research aims to identify the concentrations of heavy metals Cu, Hg, and Pb in sediments in the Batang Ayumi River. This research uses a descriptive exploratory method by conducting a survey in advance. Determination of sampling locations using purposive sampling method at four determined stations. This research uses an Atomic Absorption Spectrophotometer. Data analysis was performed by comparing the test result data with the quality standards issued by the IADC / CEDA. The test results show that the concentration of Cu, Hg and Pb in the sediment has a value smaller than the target level value, so the substance in the sediment is not too dangerous for the environment.


2020 ◽  
Vol 7 (1) ◽  
pp. 9-18
Author(s):  
Aminudin Afandhi ◽  
Yayan Atma Kunjana ◽  
Fery Abdul Choliq ◽  
Amin Setyo Leksono

The objectives of this study were to evaluate the efficacy of MIPC to control the brown planthopper Nilaparvata lugens, one of the most damaging pests of rice in the field and determine the effect of various of its doses on the growth of the fungus B. bassiana. The research was carried out in a rice field and in the Biological Agents Development Laboratory, Department of Pests and Plant Diseases, Faculty of Agriculture, Brawijaya University, Indonesia. The field efficacy test of the MIPC insecticide was conducted by applying 0.5-, 1.0-, 1.5-, and 2.0-kg/ha doses. The insecticidal compatibility test of MIPC with B. bassiana was conducted in 0.5-, 1.0-, 1.5-, and 2.0-g/L doses of MIPC. Application of MIPC insecticide at 0.5-, 1.0-, 1.5-, and 2.0-kg/ha doses had no significant difference in reducing N. lugens population in the vegetative phase (28 to 70 days after planting). The MIPC doses of 1.0, 1.5, and 2.0 g/L were highly toxic or incompatible with the growth of B. bassiana. Meanwhile, a sublethal concentration of MIPC insecticide of 0.5 g/L was non-toxic to B. bassiana. Therefore, this study recommends the use of 0.5 g/L MIPC combined with B. bassiana fungi.


2018 ◽  
Vol 7 (1) ◽  
pp. 37
Author(s):  
Rodhiyah Patmawati ◽  
Hadi Endrawati ◽  
Adi Santoso

Perairan Pulau Panjang dan Teluk Awur merupakan lokasi wisata dan dimanfaatkan masyarakat sebagai sumber mata pencaharian. Zooplankton berperan sebagai konsumen tingkat satu yang menghubungkan fitoplankton dengan organisme tingkat tinggi. Tujuan dari penelitian ini adalah  untuk mengetahui komposisi, kelimpahan, indeks keanekaragaman, indeks keseragaman, indeks dominansi zooplankton di perairan Pulau Panjang dan teluk Awur. Metode yang digunakan dalam penelitian ini adalah deskriptif eksploratif dan penentuan lokasi menggunakan metode purposif sampling. Penelitian ini terbagi atas 5 stasiun dengan 3 sub-stasiun di setiap stasiun. Pengambilan sampel zooplankton dengan cara aktif dengan menarik planktonet secara horizontal. Pengambilan sampel dilakukan pada bulan Januari 2017. Hasil penelitian diperoleh 31 genera zooplankton dari 8 fila di perairan Pulau Panjang dan 20 genera zooplankton dari 3 fila di perairan Teluk Awur. Kelimpahan rata-rata zooplankton berkisar antara 378 Ind/L – 892 Ind/L di perairan Pulau Panjang dan 341 Ind/L – 446 Ind/L di perairan Teluk Awur. Indeks Keanekaragaman zooplankton menunjukkan nilai  2,36 – 2,68 di perairan Pulau Panjang dan 2,29 – 2,62 di perairan Teluk Awur yang termasuk dalam kategori sedang. Indeks keseragaman zooplankton menunjukkan nilai 0,75 – 0,88 di perairan Pulau Panjang dan 0,89 – 0,94 di perairan Teluk Awur yang termasuk dalam kategori Tinggi. Indeks dominansi di kedua lokasi menunjukkan tidak ada genus tertentu yang mendominasi dengan nilai 0,12 – 0,25 di perairan Pulau panjang dan 0,07 – 0,11 di perairan Teluk Awur.  Panjang Island and Teluk Awur waters are a marine tourism places and both the waters are also utilized as a source of community livelihood. Zooplankton role is as the first-level consumer that connects phytoplankton with the high-level organisms. The purpose of this research was to know the compotition, abundance, diversity index, evennes index and dominance index of zooplankton in the waters of Panjang Island and Teluk Awur of Jepara Regency. This research used deskriptive eksplorative method and determination location used purposive sampling method. This study was divided into 5 stations and with 3 sub-stations at each station. Zooplankton sampling was horizontally active by pulling the plankton-net. Sampling was done in january 2017. The results found 31 zooplankton genera of 8 phyla in Panjang Island waters and 20 zooplankton genera of 3 phyla in Teluk Awur waters. The average abundance ranged from 378-892 ind/L in Panjang Island waters and 341-446 ind/L in Teluk Awur waters. The zooplankton Diversity Index indicated the values of 2.36 - 2.68 in Panjang Island waters and 2.29-2.62 in Teluk Awur waters  which were in the medium category. The zooplankton evenness index indicated a value of 0.75-0.88 in Panjang Island waters and 0.89-0.94 in Teluk Awur waters belonging to the High category. The dominance index at both sites indicated that no particular genus dominating with the values of 0.12 - 0.25 in Panjang Island waters and 0.07-0.11 in Teluk Awur waters.


2016 ◽  
Vol 1 (3) ◽  
Author(s):  
Nirwana Fajri Harahap

The aim of this research is to find out the diversity, abundance, and dominance of leafaud planthopper (Auchenorrhyncha: Hemiptera) along with the types of weeds grow in rice field ecosystem in South Rantau of Labuhan Batu regency. This research was conducted by using purposive random sampling by using insect net. The collection of hopper was done by swinging the insect net for 50 times that took place in north, south, middle, east and south so that the amount of the sampling was 250 swings. The result of this research showed that there were 6 types of rice pests in vegetation period until stublade field in south Rantau of Labuhan Batu regency. They were : Nilaparvata lugens, Nephotettix sp, Cofana spectra, Recilia dorsalis, Thaia sp, Cicadulina bipunctata. The highest abundance was found in Nilaparvata lugens with 407 individuals, Nephotettix sp with 32 individuals, Cofana spectra with 38 individuals, Recilia dorsalis with 26 individuals, Thaia sp with 19 individuals,  and Cicadulina bipunctata with only 1 individual, with low diversity index, it was 0,1075. While the weeds found in south Rantau of Labuhan Batu regency were 5 types, they were Cyperus iria ,Cyperus rotundus,Papalum distichum, Alternanthera philoxeroides, Cyperus pilosus. The highest density was found in Cyperus iria weed, with total 25%, whilw the lowest density was found in Papalum distichum with total only 10%. The highest presence frequency was found in Cyperus iria, Cyperus rotundus, Papalum distichum,  Alternanthera philoxeroides with total 20%, while the lowest presence frequency was found in Cyperus pilosus with total 16%. The highest dominance was found in Cyperus rotundus with total 23.34%, while the lowest dominance was found in Cyperus pilosus with total 15.83%, and the highest important value index was found in Cyperus rotundus with total 64.24%, while the lowest important value index was found in Papalum distichum with total 52.69%. Keywords : Diversity, abundance, dominance, leafaud planthopper


2019 ◽  
Vol 8 (2) ◽  
pp. 197-203
Author(s):  
Cinthya Ruhanto Putri ◽  
Ali Djunaedi ◽  
Subagyo Subagyo

Perairan Morosari yang terletak di Kecamatan Sayung, Kabupaten Demak merupakan tempat terjadinya percampuran antara air darat dan air laut. Disekitar perairan Morosari terdapat pemukiman penduduk, industri wisata dan aktifitas nelayan. Aktivitas masyarakat dan wisatawan tersebut akan menimbulkan perubahan yang mengarah pada peningkatan pencemaran yang berimbas kepada keberadaan fitoplankton. Tujuan dari penelitian ini adalah untuk mengetahui komposisi, kelimpahan, distribusi, struktur komunitas dan indeks saprobitas fitoplankton di perairan Morosari. Metode yang digunakan dalam penelitian ini adalah deskriptif eksploratif dan penentuan lokasi menggunakan metode purposive sampling. Penelitian ini terbagi atas 3 sub-area di 3 area yang berbeda. Pengambilan sampel zooplankton dengan cara aktif dengan menarik planktonet secara horizontal. Hasil penelitian diperoleh 24 genera fitoplankton dari 3 kelas di perairan Morosari. Kelimpahan fitoplankton bervariasi antara 12.556 – 19.108 individu/m3. Distribusi fitoplankton tidak merata dan cenderung mengikuti arah arus. Indeks keanekaragaman menunjukkan nilai 1,70–2,25 yang termasuk dalam kategori sedang. Indeks keseragaman fitoplankton menunjukkan nilai 0,71–0,81 yang termasuk dalam kategori Tinggi. Indeks dominansi di perairan Morosari berkisar antara 0,18–0,29 dan termasuk ke dalam kriteria tidak ada jenis yang mendominasi. Indeks Saprobik menunjukkan nilai 0,6–1,3 yang termasuk dalam kategori β–Mesosaprobik. Morosari waters located in District Sayung, Demak Regency is waters area there is a mixture of land and sea water. Surrounding the Morosari waters there are residential, tourist industry and fishing activities. These activities will be affected changes that lead to increased pollution that affects the presence of phytoplankton. The purpose of this research was to know the composition, abundance, distribution, community structure and saprobity index of phytoplankton in Morosari waters, Sayung Subdistrict, Demak District. This research used deskriptive eksplorative method and determination location used purposive sampling method. The results obtained 24 genera phytoplankton of 3 classes. The abundance of phytoplankton ranges from 12.556-19.108 individu/m3. The distribution of phytoplankton is uneven and tends to follow the current direction. The phytoplankton Diversity Index indicated the values of 1,70–2,25 which were in the medium category. The phytoplankton evenness index indicated a value of 0,71 to 0,81 belonged to the High category. The dominance index in Morosari waters indicated no particular genus dominating with the values of 0,18-0,29. The Saprobik Index indicated the values of 0,6–1,3 which were into the category β –Mesosaprobic.


2020 ◽  
Vol 9 (1) ◽  
pp. 81-86
Author(s):  
Siti Aminah ◽  
Ria Azizah Tri Nuraini ◽  
Ali Djunaedi

ABSTRAK : Fitoplankton merupakan dasar dari rantai makanan (primary producer) di perairan. Fitoplankton juga memiliki fungsi lain yaitu sebagai  bioindikator untuk mengevaluasi kualitas dan tingkat kesuburan perairan. Keberadaan fitoplankton sangat penting karena mendukung seluruh kehidupan biota laut lainya. Tujuan penelitian ini adalah untuk mengetahui struktur komunitas fitoplankton dan kualitas perairan di sekitar ekowisata “Dewi Mangrove sari” berdasarkan kelimpahan dan keanekargaman fitoplankton. Penelitian ini di laksanakan pada tanggal 26 Juni 2018 dan 7 November 2018. Penelitian ini dilakukan di  sekitar ekowisata mangrove “Dewi Mangrove Sari” Pandansari, Desa Kaliwlingi, Kabupaten Brebes, Jawa Tengah,  dengan 3 stasiun dan 3 pengulangan pengambilan sampel.Metode yang digunakan dalam penelitian ini adalah metode deskriptif, sedangkan dalam penentuan titik lokasi pengambilan sampel fitoplankton menggunakan metode purposive sampling. Hasil dari penelitian ini ditemukan 4 dari 22 genus yaitu,  Bacillariophycea dengan 15 genus,  Dynophyceae dengan 5 genus, Cyanophyceae dengan1 genus dan Crysophyceae ditemukan 1 genus. kelimpahan fitoplankton sebesar 42.555,67 Ind/L pada Bulan Juni 2018 dan 44.072,17 Ind/L untuk bulan November termasuk dalam kondisi kesuburan tinggi (Eutrofik). Indeks keanekaragaman (H’) berkisar antara 1,91 - 2,57, indeks keseragaman (e) berkisar antara 0,65-0,84, indeks dominasi (C) berkisar antara 0,13 – 0,18. Dapat disimpulkan  bahwa indeks keanekaragaman di perairan sekitar ekowisata “Dewi Mangrove Sari” Pandansari, Desa kaliwlingi, Kabupaten Brebes, Jawa tengah termasuk dalam kategori tinggi dan tidak ada dominasi. Perairan sekitar ekowisata “Dewi Mangrove Sari” cukup stabil dan persebaran individu pada setiap genus cukup merata dan tidak ada jenis yang mendominasi. ABSTRACT: Phytoplankton are the basis of the food chain (primary producer) in water. Phytoplankton also has another function, namely as a bio-indicator to evaluate the quality and level of water fertility. The existence of phytoplankton is very important because it supports all other marine life. The purpose of this study was to determine the structure of the phytoplankton community and the quality of the waters around the ecotourism "Dewi Mangrove sari" based on the abundance and diversity of phytoplankton. This research was carried out on 26 June 2018 and 7 November 2018. The research was conducted around the Pandansari "Dewi Mangrove Sari" mangrove ecotourism, Kaliwlingi Village, Brebes Regency, Central Java, with 3 stations and 3 sampling repeats. The method used in this research is descriptive, while in determining the location of phytoplankton sampling locations using a purposive sampling method. The results of this study found 4 out of 22 genera namely, Bacillariophycea with 15 genera, Dynophyceae with 5 genera, Cyanophyceae with 1 genus and Crysophyceae found 1 genus. Phytoplankton abundance of 42,555.67 Ind / L in June 2018 and 44,072.17 Ind / L for November included in conditions of high fertility (Eutrophic). Diversity index (H ') ranged from 1.91 to 2.57, uniformity index (e) ranged from 0.65 to 0.84, dominance index (C) ranged from 0.13 to 0.18. It can be concluded that the diversity index in the waters around Pandansari's "Dewi Mangrove Sari" ecotourism, Kaliwlingi Village, Brebes Regency, Central Java is included in the high category and there is no dominance. The waters around the ecotourism "Dewi Mangrove Sari" are quite stable and the distribution of individuals in each genus is quite evenly distributed and no species dominates. 


2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Dwi Agustin Hening Widowati

Abstract:  Orchid is one of the plants that have different characteristics in each species and its habitat. Orchids (Orchidaceae) or nation is a group that is protected by Government Regulations  Number. 7 Th.1999. It is necessary to look at the type of data collections and save it, and look at the characteristics of tropical forests in the Resort Way Kanan. This research aims to inventory orchid the found in Forest Resort of Way Kanan. This research was conducted in December 2014 until January 2015, using purposive sampling method and using techniques Line transeck, cut the line following the path of the Post traking Right Way to the SRS (Sumatran Rhino Sanctuary), in this research using 4 stations between stations within 2km. The results of this study were obtained 23 species of orchids with 9 genera and 14 species include: the genus Dendrobium, Dendrobium creatceum, Dendrobium crumenatum, genus Grammatophyllum, Grammatophyllum scriptum BL, Agrostophyllum genus, the genus Cymbidium, Cymbidium chloranthum, Cymbidium hartinahianum, Calanthe genus, the genus Bulbophyllum, Arachnis sp, Angraecum didieri, Ascocentrum miniatum, Ascocentrum aureum, Coelogyne foerstermanni, golden shower Oncidium, Phalaenopsis amabilis, Spathoglottis sp. Having analyzed the data obtained it has a value equal to 46% of species density and relative density of 88.36% with a diversity index value of 1.3, based on the criteria of the Shannon-Wienner in Fachrul abundant species diversity can be expressed with the criteria being. The results of this study compiled into resources in conserving germplasm in the form of books and banner summary information, because there are some orchids are found in Forest Resort Way Kanan Balai Way Kambas National Park in Government Regulations  Number. 7 Th.1999 is a protected species of orchids. Orchid is a protected plant species, therefore it is necessary for us to maintain and preserve it.


Sign in / Sign up

Export Citation Format

Share Document