Fruit flies (Diptera: Tephritidae) are main pests in fruit and vegetable cultivation. There are 4000 species offruit flies in the world and 35% of them are important pests, including commercial fruits that have high economic value.Merawang District is one of the centers of horticultural production, especially fruits and vegetables. One of the threats to theproduction of horticultural commodities is the attack of fruit flies. The purpose of this study was to determine the diversity,distribution, and types of fruit flies in horticultural crops in Merawang Sub-District, Bangka District. The research wasconducted in descriptive method, in this case, the survey method was also used. The sampling was done in purposivesampling method. In total, 1248 specimen of fruit flies were collected by using different attractant traps and identified. Themethyl eugenol (ME) and cue lure (CUE) attractants trapped 1076 and 172 specimens, respectively. The diversity of fruit fliesin Merawang Sub-District was relatively low, in total 9 species fruit flies were observed and identified as Bactrocera dorsalis(Hendel), B. umbrosa (Fabricius),  B. carambolae (Drew & Hancock), B. occipitalis (Bezzi), Zeugodacus cucurbitae (Coquillett),B. albistrigata (de Meijer), Z. caudata (Fabricius), B. limbifera (Bezzi), and Dacus nanggalae (Drew & Hancock). The speciesdominant observed at the study site were B. dorsalis (Hendel), B. carambolae (Drew & Hancock), and B. occipitalis (Bezzi).Air Anyir Village was the highest number of fruit flies species.

Lestari T, Apriyadi R. 2017. Genetic potential of cassava biodiversity in Bangka Island, Indonesia. Cell Biol Dev 2: 41-45. Cassava is potential as a mixture ingredient of flour in the Bangka's food industry. This study aimed to discover the biodiversity of local cassava in Bangka. This research was conducted in experimental field of the Faculty of Agriculture, University of Bangka Belitung, Indonesia from July 2015 to July 2016. The experimental design was randomized block design with 10 local cassavas of Bangka that consisted of upang, sekula, bayel, mentega, kuning, batin, pulut, sutera, rakit, and Selangor. Isozyme analysis performed using starch gel electrophoresis with horizontal models. Analysis for five Bangka local cassava varieties and one National cassava variety used RAPD group OP A and OP B. The results showed that the phenotypic performance was different on the type of plant, the morphology of leaves, stems, and tubers of local cassava of Bangka. Isozyme analysis showed polymorphic banding pattern, while the eight RAPD primers used did not produce polymorphic. This research showed Bangka local cassava morphologically different based on visual observation. Morphological character of Bangka local cassava leaf was divided into three shapes of lobe: ellipse (upang, sekula, bayel, mentega, batin, pulut, rakit, Selangor), linear (kuning) and lanceolate (sutera). This research data showed that the genetic diversity of local cassava in Bangka relatively high. Bangka local cassava has genetic potential as plant propagation material for plant breeding.

is a drought-tolerance plant that have ability to survive on post-tin mining land. One way to increase the optimum growth and production of sorghum on post-tin mining land can be done by ameliorant addition. The objective of the study was to increase the optimum growth and production of sorghum in post-tin mining land. The experiment had been conducted in post-tin mining area located in Dwi Makmur Village, Merawang, Bangka, from November 2017-May 2018. The experiment was conducted using Completely Randomized Design (RAL) with 1 (one) single factor as follows: Control (C0), NPK (C1), 40 gram phosphate solubilizing fungi (C2), SP36 100 kg ha-1 (C3), SP36 200 kg ha-1 (C4). The results showed that the application of 40 grams phosphate solubilizingfungi (C2) had the highest value on the dissolved solid total (° Brix). Complete NPK fertilizer (C1) has the highest root growth when its compared to other treatments. This indicates that full NPK fertilizer (C1) are able to increase the production of seeds/plant and harvest index (%). The addition of ameliorant is able to increase the optimum growth and production of sorghum in post-tin mining land of Bangka.

Abstract. Lestari T, Apriyadi R, Mustikarini ED, Saputra W, Merlin Y. 2020. The application of palm-oil waste as organic materials on three pineapple accessions cultivated on post-tin mining land in Bangka Island, Indonesia. Nusantara Bioscience 12: 40-45. Tin mining activities in Bangka Island have produced a vast extent of critical lands that contain clay and tailings. Bangka local pineapple accessions have a high potential to be cultivated in the post-tin mining area as they are able to adapt to drought. The aim of this research was to investigate the growth performance of three pineapple accessions planted on post-tin mining land in Bangka by utilizing solid waste of oil palm as organic materials. The study was conducted in Dwi Makmur village, Merawang Sub-district, Bangka District from November 2017 to June 2019. The experiment used Factorial Completely Randomized Design (FCRD) with two factors: the first was three pineapple accessions (i.e. Toboali Bikang, Peranak and Bogor) and the second was palm oil solid waste (i.e. palm oil empty bunch (POEB) and palm oil bare ash (POBA)). We measured the parameters of vegetative and generative and the values were compared using Fisher test followed by Duncan Multiple Range Test (α 0.05). We also conducted organoleptic tests and total dissolved solid tests to assess the quality of the fruit. We found that the application of POEB as organic materials affected the vegetative and generative parameters. We also found that the interaction of POEB with Peranak accession resulted in the best fruit productivity. Our results suggest that Peranak accession is potential to be cultivated in post-tin mining land in Bangka with the application of palm oil empty bunch as organic materials.

Lestari T, Mustikarini ED, Apriyadi R, Anwar S. 2019. Early stability test of mutant candidates of Bangka local cassava, Indonesia. Biodiversitas 20: 337-342. Cassava production in Indonesia has decreased due to decreased harvest area. Increasing production can be done by improving genetic diversity through gamma-ray irradiation to create high production mutant. The purpose of this study was to determine the optimum irradiation doses in relation to improve production of local cassava from Bangka Island, as well as morphological changes resulting from the irradiation. The research was conducted at the Experimental Garden, the University of Bangka Belitung, Indonesia in September 2017 until April 2018. This experiment was using Split Plot design, with the main plot consisted of 2 levels and subplot have 3 treatment levels, and 4 replications, in total there were 24 experimental units. The results showed that gamma-ray irradiation had very significant effect on plant height, number of leaves, young leaf color, stem color, and number of lobes. Gamma-ray irradiation on 3 Bulan accession showed an improved tuber production, whereas in Malang varieties gamma-ray irradiation decreased tuber production. Gamma-ray irradiation dose of 30 Gray was able to improve the number of tubers, tuber weight and starch content on 3 Bulan cassava accession.