Effects of fungicides on the fungi associated with cassava tubers (Manihot esculenta Crantz) from Ilorin Metropolis, Nigeria.
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Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Science, Technology, Mathematics and Education
Abstract
This study investigated in vitro effects of different concentrations of Team fungicide and Z-Force fungicides on the mycelial growth of fungi associated with cassava tuber rot. Team fungicide contained 12% Carbendazim and 63% Mancozeb and only 80% mancozeb was present as Active Ingredient (A.I) of Z-Force fungicide. Aspergillus flavus, Aspergillus niger and Rhizopus stolonifer were isolated from infected tubers after incubation at 27±2o C for one week. Different concentrations of each fungicide (100 mgL-1 , 200mgL-1 , 400 mgL-1 and 500mgL-1 ) were prepared and their effects on mycelia growths were observed. R. stolonifer was the most pathogenic causing rot symptoms with mean diameter value of 29.10mm while A. niger and A. flavus induced rot with mean diameter of 22.70mm and 17.30mm, respectively. The Team fungicide, at 100mg/L retarded the mycelial growth of A. niger and the inhibitory zone covered 34.00mm which was significantly different from the value recorded for A. flavus (57.57mm) but it had no effect on the mycelial growth of R. stolonifer. The same concentration of Z-Force fungicide was less inhibitory to the growth of the two Aspergillus spp. than Team fungicide. A. niger was observed to have higher inhibitory zone at 200mgL-1 out of the two fungicides tested in this study but concentration had no effect on the growth of R. stolonifer. At the highest concentration, the mycelial growth of A. niger and A. flavus was completely arrested. No inhibition was observed in the control experiment. The synergy between carbendazim and mancozeb in Team fungicide was noted. This study aim at comparing the inhibitory effects of Team fungicide and Z-Force fungicide against fungi associated with cassava tubers.
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Keywords
Cassava, Mancozeb, Carbendazim, Fungicides, Mycelial growth
Citation
2. Garuba, T., Ebitimi, L.K., AbdulRahaman, A.A. & Amadi, J.E. (2013): Effects of fungicides on the fungi associated with cassava tubers (Manihot esculenta Crantz) from Ilorin Metropolis, Nigeria. Journal of Science, Technology, Mathematics and Education, 10(1); 56-62