Effect of some organic amendments on onion bulb rot |
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Authors: | N Özer N D Köycü M Mirik H Soran D Boyraz |
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Institution: | (1) Dept. of Plant Protection, University of Trakya, 59030 Tekirdağ, Turkey;(2) Dept. of Soil Sciences, Faculty of Agriculture, University of Trakya, 59030 Tekirdağ, Turkey;(3) Dept. of Biology, Faculty of Education, University of Hacettepe, Ankara, Turkey |
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Abstract: | The effect of soil amended with stalks of sunflower (Helianthus annuus L.), alfalfa (Medicago sativa L.) and Hungarian vetch (Vicia pannonica Crantz) on onion bulb rot caused byFusarium oxysporum Schlecht. f.sp.cepae (Hanz.) Snyder Hansen andAspergillus niger v. Tieghem was tested in a soil naturally infested with the pathogens under field conditions. All treatments significantly
reduced bulb rot incidence. The fungal and antibacterial populations varied among all of the amended tested soils. Heterotrophic
fungal populations were more effective than heterotrophic bacterial populations in the suppression of disease. The highest
population of fungal microflora was found in plots amended with sunflower stalks. The carbon-to-nitrogen ratio and available
moisture content of amended soils have an indirect suppressive role on disease, by increasing the heterotrophic fungal population.
http://www.phytoparasitica.org posting June 18, 2002. |
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Keywords: | Onion (Allium cepa) organic amendment bulb rot |
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