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All Journal HAYATI Journal of Biosciences AGRITROPICA : Journal of Agricultural Sciences
SEMPURNA GINTING
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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Effect of Leaf Litters and Soils on Viability of Entomopathogenic Fungi Beauveria bassiana (Bals.) Vuill LISDAR IDWAN SUDIRMAN; YUSMANI PRAYOGO; YUNIMAR YUNIMAR; SEMPURNA GINTING
HAYATI Journal of Biosciences Vol. 15 No. 3 (2008): September 2008
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (59.005 KB) | DOI: 10.4308/hjb.15.3.93

Abstract

Viability of Beauveria bassiana is extremely low due to toxic compounds in soils. This research was aimed to study the effect of four groups of media on viability of B. bassiana Bb-Pb2. The first group was leaf litters of onion, flowering white cabbage, cabbage, and chinese mustard, respectively; the second group was the soils containing decomposed residues of each plant of the first group; the third group was the mixtures of each media of both groups above (1:1), and the fourth group was natural top soil as a control. Each plastic bag filled with one kg of each medium was inoculated with ten ml of B. bassiana conidia (106/ml of concentration) and incubated in open area for 8 weeks. The results showed that all leaf litters of those plants and their compost soils affected the fungal viability. The highest decreasing number of colony was found on onion’s leaf litters, soil containing of decomposed onion, and the mixtures of both media. The treated B. bassiana showed significant reducing abilities of growth, conidia production and conidia germination on PDA media, except the one of control. It is suggested that the Bb-Pb2 isolate might not be effective as bioinsecticide in the soils containing either those leaf litters or composts. Key words: Beauveria bassiana, viability, leaf litters, soils
First Report of Banana Bunchy Top Disease on Banana in Bengkulu. Mimi Sutrawati; Sempurna Ginting
AGRITROPICA : Journal of Agricultural Sciences Vol 3, No 2 (2020)
Publisher : Badan Penerbitan Fakultas Pertanian (BPFP)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agritropica.3.2.82-87

Abstract

Banana is a horticulture crop that has economic value and is widely cultivated in tropical countries. Banana production in Bengkulu province reached 259,748 quintals, then durian (110,387 quintals), tangerines (94,396 quintals) (BPS 2015). Banana bunchy top disease caused by Banana bunchy top virus (BBTV) infection is considered the most crucial virus disease affecting yield losses of a banana plantation in Asia, Africa, and the South Pacific. However, the incidence and molecular characters of BBTV has never been reported in Bengkulu. This research aims to characterize symptom variations, disease incidence, and disease severity of BBTV infection in Bengkulu and virus detection using molecular methods by polymerase chain reaction (PCR). Disease incidence of BBTV was measured based on field symptoms. The disease survey was conducted in Bengkulu city, Bengkulu Utara district, and Rejang Lebong district. The study showed that the incidence of BBTV in Bengkulu City, Bengkulu Utara, and Rejang Lebong ranged from 0% to 100%. The most common symptoms observed in the field involved vein clearing, upturned leaf, chlorotic, and ragged margins, reducing petiole length, distance, lamina width, and stunting. Banana crops that are infected with BBTV in the vegetative phase will not produce fruit. In contrast, viral infection in the generative phase causes the formation of stunted fruit that is not suitable for harvesting. Thus, the potential loss of yield due to stunted disease can reach 100%. This study's results are the first reports of BBTV infection in banana crops in Bengkulu. Disease diagnosis will form the basis of disease control strategies in banana crops.
Co-Authors LISDAR I. SUDIRMAN Mimi Sutrawati YUNIMAR YUNIMAR Yusmani Prayogo