Determination of seedborne fungi in Onion and their transmission to Onion sets

Köycü, Nagehan Desen; Özer, Nuray

doi:10.1007/bf02981476

Cited by 40 publications

(33 citation statements)

References 6 publications

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“…cepae is one of the most devastating diseases of onion and causes serious yield losses in all growing areas of the world. The main source of the disease was determined as contaminated seeds and soil (Köycü & Özer 1997). Fungicide seed treatments and soil fumigation were reported to reduce the disease incidence (Jaworskı et al 1978;Köycü & Özer 1997;Sumner et al 1997;Özer & Köycü 1998;Cramer 2000).…”

Section: Discussionmentioning

confidence: 99%

“…The main source of the disease was determined as contaminated seeds and soil (Köycü & Özer 1997). Fungicide seed treatments and soil fumigation were reported to reduce the disease incidence (Jaworskı et al 1978;Köycü & Özer 1997;Sumner et al 1997;Özer & Köycü 1998;Cramer 2000). However, usage of these chemicals for the control of the disease is not economical and causes the development of fungicide-resistant strains of the pathogen.…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported that seed treatments with fungicides such as benomyl, carbendazim, carboxin, maneb, methoxymehtyl mercury chloride, prochloraz, tebuconazole, and thiram reduced the disease on onions (Köycü & Özer 1997;Özer & Köycü 1998;Cramer 2000). The most effective control of the disease is soil fumigation with fumigants such as methyl bromide and chloropicrin (Jaworskı et al 1978;Köycü & Özer 1997;Sumner et al 1997). However, because of the negative effects of these chemicals on both environment and public health, their usage has been banned in many countries (Fan et al 2008).…”

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confidence: 99%

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Evaluation of antifungal activity of sodium salts against onion basal rot caused by Fusarium oxysporum f.sp. cepae

Türkkan¹,

Erper²

2014

Plant Prot. Sci.

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Türkkan M., Erper I. (2014): Evaluation of antifungal activity of sodium salts against onion basal rot caused by Fusarium oxysporum f.sp. cepae. Plant Protect. Sci., 50: 19-25.The efficacy of twelve sodium salts as possible alternatives to synthetic fungicides for the control of onion basal rot caused by Fusarium oxysporum f.sp. cepae was evaluated. In vitro tests showed that there were significant differences between the inhibitory effects of sodium salts on the mycelial growth (P ≤ 0.05) and 2% (w/v) concentrations of sodium metabisulfite and sodium fluoride completely inhibited mycelial growth of the fungus, while other salts did not. Sodium metabisulfite and sodium phosphate monobasic had lower pH values than the other salts. Unlike sodium metabisulfite, sodium phosphate monobasic could not decrease the mycelial growth. The ED 50 , minimum inhibition concentration (MIC), and minimum fungicidal concentration (MFC) values indicated that sodium metabisulfite was more inhibitory to the fungus compared to sodium fluoride. In soil tests, inhibitory effect of sodium metabisulfite on the fungus was higher than that of sodium fluoride, where sodium metabisulfite completely inhibited mycelial growth at even 0.4% concentration.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Evaluation of antifungal activity of sodium salts against onion basal rot caused by Fusarium oxysporum f.sp. cepae

Türkkan¹,

Erper²

2014

Plant Prot. Sci.

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“…Contaminated seeds and soil appear to constitute the main inoculum source (Kaul 1973;Gupta et al 1984;Hayden et al 1994;Köycü and Özer 1997). The species responsible for black mold rot is usually referred to as Aspergillus niger, a member of Aspergillus section Nigri .…”

Section: Introductionmentioning

confidence: 99%

Black Aspergilli and fumonisin contamination in onions purchased in Hungary

Varga¹,

Kocsubé²,

Szigeti³

et al. 2012

Acta Alimentaria

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Black mold rot caused by black Aspergilli is an important post-harvest disease of onion worldwide. Usually Aspergillus niger is cited as the causative agent based on morphological criteria. In this study, the mycobiota and fumonisin contamination of mouldy onion bulbs purchased in Hungary were examined. All except one of the examined mouldy samples were found to be contaminated with black Aspergilli, which could be isolated both from the outer dry and the inner fleshy scales of onion bulbs. Species assignment of the isolates was carried out using sequence analysis of part of the calmodulin gene. Sequence data revealed that all 35 black Aspergilli isolated from onions belong to the Aspergillus awamori species. The range of fumonisin isomers present in the onion samples was also examined using reversed-phase high-performance liquid chromatography/electrospray ionization -ion trap mass spectrometry.Two of the examined onion samples were found to be contaminated with fumonisins at a rate of about 0.3 mg kg -1 . This is the first report on fumonisin contamination of onion bulbs. The fumonisin isomers observed include fumonisins B 2-4 , 3-epi-FB 4 , iso-FB 1 (FB 6 ) and an iso-FB 2,3 form. The range of fumonisin isomers detected in the onion bulbs indicates that probably A. awamori is responsible both for mold rot and fumonisin contamination of onions in Hungary.

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“…The pathogen is transmitted by contaminated seed or soil, usually starts infection at the germination stage of onion seeds, and may continue until and throughout storage (Hayden and Maude 1992;Hayden et al 1994a;Köycü and Ö zer 1997;Sirois et al 1998). Polygalacturonases produced by this fungus cause rapid and extensive tissue degradation of onion seeds (Ö zer et al 1999a).…”

Section: Introductionmentioning

confidence: 97%