Widodo .
Institut Pertanian Bogor

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Pengaruh Empat Galur Bakteri Pemacu Pertumbuhan Tanaman dan Waktu Inokulasi Virus terhadap Keparahan Penyakit Daun Keriting Kuning Cabai Hari Priwiratama; Sri Hendrastuti Hidayat; Widodo .
Jurnal Fitopatologi Indonesia Vol. 8 No. 1 (2012)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (308.205 KB) | DOI: 10.14692/jfi.8.1.1

Abstract

Plant growth-promoting rhizobacteria (PGPR) has effectively reduced infection of pathogens. Bacillus polimixa BG25, B. subtilis SB3, Pseudomonas fluorescens PG01, P. fluorescens S32, and their combinations were used as seed treatment. Bemisia tabaci (Hemiptera: Aleyrodidae) was used to inoculate Geminivirus at 3, 5, and 6 weeks after planting. Seeds without any bacteria treatment were used as controlled plant. Treatment of PGPR and time of inoculation were significantly effect disease intensity, but not incubation period. Late infection of Geminivirus reduced disease intensity. Based on measurement of plant height, number of branch, and flowers it was concluded that some bacterial treatments was significantly effect plant growth. Key words: Bemisia tabaci, Geminivirus, PGPR, plant growth promoting rhizobacteria
Penyakit Keriting Daun Pepaya yang Disebabkan oleh Cladosporium cladosporioides Widodo .; Suryo Wiyono
Jurnal Fitopatologi Indonesia Vol. 8 No. 1 (2012)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (367.654 KB) | DOI: 10.14692/jfi.8.1.28

Abstract

Leaf curling and chlorotic spot on young leaves of papaya type California was observed in Bogor, Kebumen, and Bekasi. Conidium of Cladosporium cladosporioides was found associated with diseased tissue based on microscopic examination. To our knowledge, this is the first report of C. cladosporioides causing papaya leaf curling in Indonesia. Key words: chlorotic, leaf curl disease, papaya disease, scab
Laporan Pertama tentang Penyakit Busuk Arang pada Kacang Tanah Suryo Wiyono; Widodo .
Jurnal Fitopatologi Indonesia Vol. 8 No. 2 (2012)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (941.546 KB) | DOI: 10.14692/jfi.8.2.54

Abstract

Peanut charcoal rot disease was first observed in Bogor,West Java in June 2010, and Serang, Banten in January 2012. Infected plants in the field showed root and stem rot, discoloration of stems and/or branches. Severe infection may cause wilting of foliage then plant dried out. Based on microscopic observation Macrophomina phaseolina was constantly associated with diseased plants from those two areas. Hot temperature and low rainfall might favour disease development. This is the first report of charcoal rot disease of peanut in West Java and Banten. Key words: charcoal rot, Macrophomina phaseolina, peanut
Keragaman Fusarium pada Rizosfer Tanaman Kacang Panjang dan Peranannya bagi Pertumbuhan Tanaman Rahmi Sutrisni; Widodo .
Jurnal Fitopatologi Indonesia Vol 8 No 5 (2012)
Publisher : The Indonesian Phytopathological Society (Perhimpunan Fitopatologi Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (422.993 KB) | DOI: 10.14692/jfi.8.5.128

Abstract

Fusarium wilt caused by Fusarium oxysporum f.sp. tracheiphilum is one of the important diseases on yard long bean. Besides of its capability of causing diseases in plants, some species of Fusarium are non pathogenic and able to control Fusarium wilt as naturally occured in disease suppressive soils. The objective of this study was to observe the rhizosphere Fusarium diversity and its role on the plant growth of yard long bean. Out of 56 isolates collected during the study, four species were identified, including F. oxysporum (39.3%), F. semitectum (28.6%), F. longipes (12.5%), F. solani (5.3%), and one unidentified Fusarium sp. (14.3%). The highest diversity index was obtained from the field planted with corn as previous crop. In general, 56 isolates tested could be differentiated into 3 groups based on their effects on plan growth, i.e.: deleterious that caused wilting or growth suppressive without wilting (50.0%), neutral that no significantly difference growth as untreated (41.1%), and growth promoting (8.9%). All three isolated Fusarium causing plant wilting identified as F. oxysporum, while isolates with growth promoting effect were identified as F. oxysporum (4 isolates) and F. solani (1 isolate). These five selected growth promoting Fusarium also suppressed the wilt disease and increased the plant growth when co inoculated with wilt pathogen of yard long bean, F. oxysporum f.sp. tracheiphillum.Key words: diversity, Fusarium, long yard bean, rhizosphere