Main Article Content
Aims: The study aims to identifying the microorganisms associated with post-harvest rot of frafra potatoes in Bongo-soe, Upper east region of Ghana.
Place and Duration of Study: Department of Horticulture and the Pathology laboratory of the Faculty of Agriculture, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana. The Solenostemon rotundifolius tubers were stored at the Horticulture Department laboratory whiles rot identification was carried out at the Pathology laboratory of the Faculty of Agriculture. The Tubers were stored from 2nd November, 2012 to 22nd March 2013.
Methodology: Four hundred (400) tubers of black cultivar and four hundred (400) tubers of a brown cultivar of Solenostemon rotundifolius tubers showing visible signs of rot during the storage were collected. Pieces of diseased tissues from the margin of the necrotic collected and immersed in 10% commercial bleach solution for sterilisation, for one minute. These were then blotted dry and plated on Potato Dextrose Agar PDA. The plates were sealed with a cellotape until growth occurred.
Results: The microorganisms identified to be responsible for causing rot in Solenostemon rotundifolius tubers were six in number. Colletotrichum gloeosporioides was identified to be responsible for 30.76% of rots observed, followed by Aspergillus niger, 23.07%, Curvularia lunata, 19.23%, Aspergillus flavus, 11.54%, Trichoderma sp and Penicillium sp both recorded 7.70% of rots observed. The percentage incidence of Aspergillus niger (15.38%), Curvularia lunata (11.54%) and Aspergillus flavus (7.69%) was higher in the black cultivar as compared with the brown cultivar which had percentage incidence of 7.69%, 7.69% and 3.85% respectively. Also, the percentage incidence of Colletotrichum gloeosporioides (15.38%) and Penicillium sp (3.85%) was the same in both the black and brown cultivars of Solenostemon rotundifolius tubers used in this study.
Conclusion: The activities of the damaging microorganisms can be reduced by controlling mechanical injury during harvesting, transportation and storage of Solenostemon rotundifolius tubers should be prevented or reduced because they pave the way for tuber infection by the rot causing microorganisms.
National Research Council, NRC. Native potatoes. Lost Crops of Africa: Vegetables. National Academies Press. 2006;II:268-285.
Opoku-Agyeman MO, Bennett-Lartey SO, Vodouhe RS, Osei C, Quarcoo E, Boateng SK, Osekere EA. Morphological characteri-zation of frafra potato (Solenostemon rotundifolius) germplasm from the savannah regions of Ghana. Plant genetic resources and food security in West and Central Africa. Regional Conference, Ibadan, Nigeria. 2004;116-123.
Burkill HM. The useful plants of west tropical Africa. J-L. Royal Botanic Gardens, Kew. 1995;3.
Apabol RR. Assessment of the performance of some frafra potato (Coleus dysentericus – Baker) Accessions in Nyankpala area of Ghana. A Dissertation submitted to the Faculty of Agriculture, UDS, in partial fulfilment of the requirements for the award of BSc Agric. Technology; 1997.
Tetteh JP, Guo I. Problems of Frafra potato (Solenostemum rotundifolius Poir.) production in Ghana. Ghana J. Agric. Sci. 1997;30:107-113
Umar AM. Review on the nutritional value, cultivation and utilization potential of some minor and under-utilized indigenous root and tuber crops in Nigeria. International Journal of Advanced Research. 2016;4: 1298-1303.
Tindall Sharma HK. Tropical roots and tubers: Production, Processing and Technology. John Wiley & Sons; 2016.
Vowotor A, Kwame, Mensah-Bonsu, Akwasi, Mutungi, Christopher, Affognon, Hippolyte. Postharvest losses in Africa – Analytical review and synthesis: The case of Ghana; 2012.
Amusa NA. Concentric leaf spot of yam (Dioscrorea sp.) in South-western Nigeria. Mycopathologia. 1999;148:33-36.
Anjorin TS, Nwokocha OV, Sanni AD. Morphological characteristics and incidence of diseases on white yam (Dioscorea rotundata L. Poir) tubers in Abuja, Nigeria. Nat Sci. 2014;12(7):58-65.
Nwankiti AO, Okpala EU. Anthracnose of water yam in Nigeria. In: Proceedings of the 6th Triennial Symposium if the International Society for Tropical Root Crops, Peru; 1983.
Green KR. Studies on the epidemiology of yam anthracnose. PhD Thesis, University of Reading; 1994.
Sikora EJ, James MD. Field and storage diseases of sweet potatoes; 1995.
(Accessed on 04/06/2013)
Mohammed A, Ishaku BC, Basiri B. Identification and control of Fungi associated with the post-harvest rot of Solenostemon rotundifolius (Poir) J.K. Morton in Adamawa State of Nigeria. Journal of Biology, Agriculture and Healthcare. 2013;3(5).
[ISSN 2224-3208 (Paper)]
[ISSN 2225- 093X (Online)].
Marthur SB, Kongsdal O. Common laboratory seed health testing methods for detecting fungi, 2nd Edition. International Seed Testing Association. Switzerland; 2003.
Barnett HL, Hunter BB. Illustrated genera of imperfect fungi. 3rd Edition. Burgess Publishing Company; 1972.
Rees D, van Oirschot Q, Kapinga R. (eds) Sweetpotato post-harvest assessment: experiences from East Africa, Natural Resource Burkill s Institute, Chatham, UK. 2013;548(2):51-66.
ISBN: 0 85954
Messiga AJNA, Mwangi M, Bandyopadhyay R, Nolte C. The status of fungal tuber rots as a constraint to cassava production in the Pouma district of Cameroon. Paper presented at the proceedings of the 9th Triennial Symposium of the International Society for Tropical Root Crops - Africa Branch, held from 31st October – 5th November 2004, at Whitesands Hotel, Mombasa, Kenya; 2004.
Okigbo RN, Agbata CA, Echezona CE. Effects of leaf extracts of Azadirachta indica and Chromolaena Odorata on post-harvest spoilage fungi of yams in storage. Current Research Journal of Biological Sciences. 2010;2(1):9-12.
Nmeka IA, Okigbo RN. Control of yam tuber rot with leaf extracts of Xylopia aethiopica and Zingiber officinale. African Journal of Biotechnology. 2005;4(8):804-807.