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Jurnal Fitopatologi Indonesia
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  This is an Open Access Journal Open Access journal
ISSN (Print) 0215-7950 - ISSN (Online) 2339-2479
Published by Bogor Agricultural University Homepage  [24 journals]
  • Cover Jurnal Fitopatologi Vol. 13 No. 5, Septerber 2017

    • Authors: Editor Jurnal Fitopatologi Indonesia
      Abstract: Editor Jurnal Fitopatologi Indonesia
      PubDate: 2018-01-26
      Issue No: Vol. 13, No. 5 (2018)
       
  • Kemampuan Mikrob Endofit dan Rizosfer Tanaman Karet dalam Mengendalikan
           Rigidoporus lignosus

    • Authors: Siti Hardiyanti, Bonny Poernomo Wahyu Soekarno, Titiek Siti Yuliani
      First page: 153
      Abstract: Rigidoporus lignosus is the most important pathogen of rubber tree which causes white root rot disease. The use of antagonistic microbe is recommended to control this pathogen. This research was conducted to isolate endophytic and rhizospheric microbes, and to study their ability to inhibit growth of R. lignosus. Research consisted of isolation of endophytic and rhizospheric microbes, pathogenicity test, in vitro and in vivo assays, growth promotion assays, and identification. There were 99 isolates of bacteria and 18 isolates of fungi isolated from the root and rhizosphere of rubber trees. In vitro and in vivo assay showed that 2 bacterial isolates, i.e.  endophytic bacteria ME8, and rhizospheric bacteria MR3; and 3 fungal isolates, i.e. endophytic fungi CB8, CB6, and CL3 were able to inhibit the growth of R. lignosus.  Endophytic bacteria ME8 showed the ability of solibilizing phosphate and fixing nitrogen. Rhizospheric bacteria MR3 showed the ability of solubilizing phosphate. The isolates CB6 and CL3 were very similar with Chaetomium sp. and Penicillium sp., respectively based on morphological characters; while CB8 was identified as mycelial sterile.  Based on 16S rRNA sequences, endophytic bacterium ME8 and rhizospheric bacteria ME3 were identified as Bacillus siamensis B268 and B. amylolyquefaciens BCRh10, respectively. Endophytic and rhizospheric microbes isolated from rubber trees has the potency as biocontrol agents of R. lignosus.
      PubDate: 2018-01-26
      Issue No: Vol. 13, No. 5 (2018)
       
  • Potensi Cendawan Endofit sebagai Pengendali Hayati Penyakit Busuk Pangkal
           Batang (Phytophthora capsici) pada Bibit Cabai

    • Authors: Evan Purnama Ramdan, Efi Toding Tondok, Suryo Wiyono, Sri Hendrastuti Hidayat, Widodo Widodo
      First page: 161
      Abstract: Stem rot disease caused by Phytophthora capsici is an important disease on chilli. Eight endophytic fungi that had been isolated and screened based on pathogenecity test were further tested for their potential as the biological control agent of the stem rot disease of chilli. The endophytic fungi suspension was applied twice during the trial. The first application was on 100 seed lot, by soaking them in 100 mL of suspension. The second application was on the 3 weeks-old chili seedlings by drenching them with 10 mL suspension per plant. The concentration of endophytic fungi  in the suspension was 2.8 × 106 cfu mL-1. The disease intensity and AUDPC value were measured for 4 weeks after the pathogen inoculation. The growth inhibition test of P. capsici  was performed in vitro and the colonization abilities of endophytic fungi were observed at 4 weeks-old chilli seedlings. Eight endophytic fungi  inhibited the growth of the P. capsici, and two of those isolates namely Penicillium strain MAG1 and Penicillium strain PAB2 showed antibiosis mechanism. Endophytic fungi has the ability more to colonize at the root (26–60%) than in the stem (20–40%). Fusarium strain MAGR1 has the highest level of endophytic colonization i.e. 60% compared to others.  Based on in vivo assay, six endophytic fungi isolates, i.e. Fusarium strain MAGR1, Penicillium strain MAG1, Penicillium strain PAB2, sterile hyphae HAJ1, sterile hyphae HAJ2, and  sterile hyphae PBG7, showed the potency to control stem rot disease with inhibition level of 25.5–35.5%
      PubDate: 2018-01-26
      Issue No: Vol. 13, No. 5 (2018)
       
  • Evaluasi Resistensi Progeni Anggrek Phalaenopsis terhadap Penyakit Busuk
           Lunak (Pseudomonas viridiflava)

    • Authors: Hanudin Hanudin, Indijarto Budi Rahardjo, Kurniawan Budiarto
      First page: 168
      Abstract: A bacterial soft rot disease caused by P. viridiflava was one of problems in orchid nursery, especially Phalaenopsis.  An evaluation on progenies derived from three crossing combinations were conducted to find out the symptom characteristic, development of infections of the disease and resistance response of the progenies against artificial infection of P. viridiflava. The research was conducted under a standard glass house conditions for Phalaenopsis involving 31 individuals from 3 progeny populations, namely P.157, E.2153 and E.2189. The results showed that symptoms were characterized by the lesion of the leaf tissues. On most accessions, the lesion enlarged and foul odor was detected as an indication of the successful establishment of bacterial infection. Based on the disease severity, three accessions (P.157-12, P.157-45, and P.157-71) had the lowest infections and were classified into resistant genotypes. One accession, i.e. P.157-32 was classified as susceptible and the rest 27 accessions were grouped into very susceptible class.
      PubDate: 2018-01-26
      Issue No: Vol. 13, No. 5 (2018)
       
  • Identifikasi Colletotrichum spp. Asal Tanaman Pepaya

    • Authors: Eryna Elfasari Rangkuti, Suryo Wiyono, Widodo Widodo
      First page: 175
      Abstract: Colletotrichum spp. is known as the causal agent of anthracnose and considered as an important limiting factors on papaya production. The objective of this study was to determine the species of Colletotrichum spp. from various plant parts of papaya (Carica papaya) showing anthracnose symptom. Twenty isolates of Colletotrichum spp. was isolated and were grouped into 3 morphological groups based on colony similarity, conidial morphology, and setae formation. A total of 12 isolates of group I and 3 isolates of group II were identified morphologically as C. gloeosporioides sensu lato based on cylindrical conidia with rounded on both ends and colony morphology.  Meanwhile, 1 isolate of group II was molecularly identified as C. magnum. Four isolates of group III with a curved and pointed-end conidia, and produced setae on artificial medium were identified molecularly as C. truncatum. C. gloeosporioides was obtained on stem, leaf petiole, and fruit. C. magnum and C. truncatum were only obtained on leaf petiole and fruit, respectively.  In addition to morphological and molecular characters, differences in colony growth responses to temperature can be used to distinguish the species of Colletotrichum. To our knowledge the existence of anthracnose symptom on the stems and leaf petioles of papaya in the fields and the discovery of C. magnum and C. truncatum isolated from papaya was the first report in Indonesia.
      PubDate: 2018-01-26
      Issue No: Vol. 13, No. 5 (2018)
       
  • Penyakit Layu Bakteri Stewart pada Jagung di Bali

    • Authors: I Gede Rai Maya Temaja, G.N. Alit Susanta Wirya, Ni Made Puspawati, Khairun Nisak Syahdu
      First page: 184
      Abstract: Stewart’s wilt is a serious disease of sweet corn (Zea mays). The typical symptoms of the disease are pale-green to yellow linear streaks parallel to the veins. The symptoms were observed on sweet corn in Denpasar, Tabanan, Gianyar, and Karangasem areas during a survey in 2015. Pathogen detection based on a polymerase chain reaction was carried out using total DNA obtained from symptomatic leaf samples and the pairs of primers, CPSL1/CPSR2c. The expected sized (~1100 bp) amplicon was detected in samples from Denpasar. Sequence analysis confirmed that Stewart’s wilt disease symptoms are caused by Pantoea stewartii subsp. stewartii. Nucleotide sequence and phylogenetic analysis showed that P. stewartii subsp. stewartii from Bali has high homology (98.97-99.08 %) and placed in the same clade with isolates from Canada, USA and Japan. This is the first report of P. stewarti subsp. stewartii on corn in Bali.
      PubDate: 2018-01-26
      Issue No: Vol. 13, No. 5 (2018)
       
 
 
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