State of the Art of Yam Production

Wumbei, Abukari; Gautier, Sopkoutie Kengni Nerlus; Kwodaga, Joseph Kwowura; Joseph, Djeugap Fovo; Galani, Yamdeu Joseph Hubert

doi:10.5772/intechopen.106504

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…Another unnoticeable threat to this plant and many other species is the cutting down of saplings, mainly by yam farmers for staking. This has already been reported in some parts of Nigeria (Tsado 2012) and elsewhere (Beckford 2009, Wumbei et al 2022.…”

Section: Common Name: False Locustsupporting

confidence: 71%

Application of IUCN Red List Criteria for Assessment of Some Savanna Trees of Nigeria, West Africa

Nodza,

Tochukwu,

Igbari

et al. 2024

Preprint

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Nigeria is one of the most floristic rich countries on the continent of Africa due to the variation in climate, which favors the growth of several species. Sadly, its biodiversity is one of the most threatened in the world, mainly due to deforestation and various unsustainable land use patterns, which are human activities. However, these anthropogenic activities are more prevalent in Nigeria's northern savanna zone (NSZ). In this study, we present the first regional conservation assessments and red listing of tree species in the northern savanna zone (NSZ) of Nigeria according to the International Union for Conservation of Nature (IUCN) criteria and categories. We recorded 31 tree species as the most utilized in the region. For the assessments, we provided the fundamental taxonomic information of each species, their local names, and their uses. This study provided the extent of occurrence, area of occupancy, population size and trend, description of habitats, and ecological requirements and discussion of the threats affecting each species and their habitats. We further inform conservation actions and research activities needed to ensure the future of the tree species and their sustainable uses. Overall, approximately 97% of the taxa were evaluated as threatened (41% as endangered, 31% as critically endangered, 24% as vulnerable, and 4% as least concerned). Therefore, we recommend the adoption of the risk status of the species to develop sound conservation strategies and measures for the management of flora in this inundated region.

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Section: Common Name: False Locustsupporting

confidence: 71%

Application of IUCN Red List Criteria for Assessment of Some Savanna Trees of Nigeria, West Africa

Nodza,

Tochukwu,

Igbari

et al. 2024

Preprint

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“…Nigeria accounts for 70% of annual production of yams worldwide (Ano 2019). Postharvest rots in yams due to A. flavus amongst other mycotic pathogens are severe in tropical locations ranging between 25%-60% (Adeniji 2019;Ano 2019;Wumbei et al 2022) and constitute a significant impediment to yam production and food security in Nigeria (Ogaraku and Usman 2008;Gwa and Nwankiti 2018). Also, A. flavus is toxigenic and contaminates stored tubers and food products with noxious aflatoxins in many tropical countries where poor traditional storage systems abound (Enyiukwu et al 2014a;Kinyungu et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Antifungal Activity of Leaf Extract of Alchornea cordifolia Against Aspergillus flavus the causal Agent of Yam Tuber Rot

Enyiukwu,

Amadioha,

Bassey

2023

J Fitopatol Indones

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Rots and mycotoxin contamination of agro-produce are prevalent in tropical world. Aspergillus flavus is a major mycotoxigenic rot contaminant of tubers in Abia state, Nigeria. Consumption of mycotoxin contaminated foodstuffs accounts for 25% of medically important human diseases in Nigeria. The objective of this study was to assess antifungal activity of Alchornea cordifolia against A. flavus a mycotoxigenic rot pathogen of stored tuber produce both in vitro and in vivo. Isolates were made from rotted yam tubers and pathogenicity test carried out to confirm A. flavus as pathogen. Five concentrations (100-500 mg mL-1) of methanol leaf extracts of the plant and thiophanate-methyl–a standard fungicide–were evaluated against the growth of the fungus in culture and pathogen-induced rot development and spread in vivo. The experiment was made up of 7 treatments and 3 replicates laid out in CRD. The plant leaf extract demonstrated varying levels of inhibition of A. flavus in vitro and rot development and spread in living tissues of yam. About 56.38%–68.22% and 67.245–80.01% inhibition was recorded by 100 mg mL-1 and 500 mg mL-1 of A. cordifolia extract for spore germination respectively whereas the same concentrations reduced rot development from 60% in the control experiment to 21.80% and 12.10% respectively which compared favorably (P<0.05) with standard fungicide, thiophanate-methyl. The plant demonstrated strong antifungal activity in vitro and minimized A. flavus induced rot advancement in living yam tissues.

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Combined effects of the assassin bug alloeocranum biannulipes mont. And sign. (hemiptera: reduviidae) and botanical powders in the control of the stored yam chips beetle, dinoderus porcellus lesne (coleoptera : bostrichidae)

LOKO,

TOFFA,

DJEGBE

et al. 2024

Open Res Africa

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Background Dinoderus porcellus Lesne (Coleoptera: Bostrichidae) is the main pest of stored dried yam chips that causes significant losses in a few months. The assassin bug, Alloeocranum biannulipes (Montrouzier & Signoret) (Hemiptera: Reduviidae) and the Khaya senegalensis (Desv.) A. Juss. (Meliaceae), Blighia sapida K. Koenig (Sapindaceae) and Bridelia ferruginea Benth. (Euphorbiaceae) leaf powders have proven to be efficient in the control of this pest. Methods This study aims to evaluate the compatibility of the leaf powders of these medicinal plants and the predator A. biannulipes in the integrated management of D. porcellus under laboratory and farm conditions. Various leaf powders were tested at a concentration of 6% (w/w) with or without the predator. Yam chips mixed with leaf powder from each species served as negative and those mixed with a synthetic insecticide as positive controls. Results The results revealed that no combination of leaf powders and predators could induce complete mortality of D. porcellus like the synthetic insecticide. No significant difference in terms of the survival of A. biannulipes exposed to botanical powders was observed compared to the positive control. Under farm conditions, B. ferruginea leaf powder showed a sub-lethal effect on the predator A. biannulipes and no impact on the abundance of D. porcellus. However, the survival of D. porcellus was significantly reduced by the combination of K. senegalensis leaf powder and A. biannulipes, which did not allow the reproduction of the predator. Conclusions We recommend the combination of K. senegalensis leaf powder and A. biannulipes for the short-term conservation of yam chips as part of an augmentative biological control program. For long-term conservation, we suggest the use of a combination of B. sapida leaf powder with the predator A. biannulipes because it presented a reduced population of D. porcellus after 8 weeks of storage and offspring of A. biannulipes.

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State of the Art of Yam Production

Cited by 4 publications

References 41 publications

Application of IUCN Red List Criteria for Assessment of Some Savanna Trees of Nigeria, West Africa

Application of IUCN Red List Criteria for Assessment of Some Savanna Trees of Nigeria, West Africa

Antifungal Activity of Leaf Extract of Alchornea cordifolia Against Aspergillus flavus the causal Agent of Yam Tuber Rot

Combined effects of the assassin bug alloeocranum biannulipes mont. And sign. (hemiptera: reduviidae) and botanical powders in the control of the stored yam chips beetle, dinoderus porcellus lesne (coleoptera : bostrichidae)

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