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Abstract
In Nigeria cassava root rot causes serious yield losses in cassava tuber production every year. However, the influence of root rot incidence on cassava genotype at harvest on consumers’ acceptability of the gari produced from it has not been studied. A sensory evaluation was conducted on gari processed from the tuberous root yield of rot susceptible TME-1 and improved TMS 30572, harvested at 12 months after planting at Sabongidda-Ora (humid forest eco-zone) of Nigeria during the 2003 and 2004 cropping seasons. A 5-point hedonic scale ranging from like extremely, through neither like nor dislike, to dislike extremely was designed to measure the degree of liking for the gari processed from both genotypes. 28 panelists were asked to indicate their degree of preference for the colour, odour and taste of each gari sample by choosing the appropriate category in the hedonic scale. The results were compared with the tuberous root rot incidence and severity of genotypes in the field. All experiments were repeated and the data collected were statistically analysed using the general linear model statistical procedures with the SAS system for windows. Comparisons among treatment means was done with the least significant square, with the Duncan multiple range test (P = 0.05). Variety TME-1 with the highest root rot incidence and severity of 53 and 21% respectively was less preferred for gari colour, texture and odour compared to TMS 30572 which had 15 and 6% rot incidence and severity respectively. In the second year trial where TME-1 still possessed the highest rot incidence and severity, panellists still showed more preference for the colour, taste and odour in TMS 30572 gari than TME-1 gari. All the differences observed and reported above between TMS 30572 and TME-1 were significantly different at probability 0.05%. The results of this experiment clearly show that high root rot incidence of a cassava genotype in the field can reduce consumer’s acceptability of the gari produced from it.
Highlights
Even though, cassava as a major food crop in the developing countries of Africa has the potentials of addressing the increasing food demand of the growing African population, yet, the average production of cassava in Africa is currently below the world average (Phillips et al, 2004; FAO, 2005)
Cassava as a major food crop in the developing countries of Africa has the potentials of addressing the increasing food demand of the growing African population, yet, the average production of cassava in Africa is currently below the world average (Phillips et al, 2004; FAO, 2005). This is due to the activities of disease agents like Botryodiplodia theobromae and Fusarium
The possibility of latent infection on cassava tubers harvested from a field with root rot incidence cannot be ruled out; this may be carried over to the eventual gari product processed from such tubers
Summary
Cassava as a major food crop in the developing countries of Africa has the potentials of addressing the increasing food demand of the growing African population, yet, the average production of cassava in Africa is currently below the world average (Phillips et al, 2004; FAO, 2005). This is to minimize waste in case of tubers harvested from field with root rot incidence. The possibility of latent infection on cassava tubers harvested from a field with root rot incidence cannot be ruled out; this may be carried over to the eventual gari product processed from such tubers.
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