29 research outputs found

    Key for a profitable and sustainable seed yam business enterprise: business plan and market development with record keeping for seed yam farmers

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    Bill & Melinda Gates FoundationPeer Revie

    Seed yam production from whole tubers versus minisetts

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    Open Access Article; Published online: 22 June 2020Yam (Dioscorea rotundata Poir.) is a major staple and cash crop for millions of households in West Africa, where about 93% of the world crop is produced. The tuber serves as food and seed. Depending on the size, seed tubers are often cut into setts, minisetts, or planted whole. An experiment was conducted to investigate the effects of using whole tubers versus minisetts to produce seed yams. Six treatments constituted combinations of whole tubers and minisetts, and three tuber-size classes, viz., 30–59 g, 60–89 g, and 90–120 g (averaged and referred to as 45 g, 75 g, and 105 g, respectively). The experiment was conducted as a randomized complete block design with three replications. Results showed that plants from whole tubers emerged from the soil faster and yielded 48% more than those from minisetts. The mean yield of 105 g minisetts (18.3 t/ha) was statistically similar to that of 45 g whole seed (17.9 t/ha). Using 45 g whole seed would save about 2 t/ha of the harvested crop for use as food instead of seed. So, planting small whole tubers is more profitable than minisetts and is recommended to yam growers

    Epidemiological analysis of yam mosaic virus (YMV) infection risk factors and its implications for clean seed yam systems

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    Yam mosaic virus (YMV) is a major threat to yam production in West Africa. This study determined factors contributing to the spread of YMV in yam fields, including the role of aphid vectors, seed-borne infections, YMV inoculum in the fields, weather, genetic diversity of the virus, and spatial distance between infected sources. The findings of this study are useful for refining YMV control measures, developing a model for disease risk assessment under different scenarios, and guiding clean seed yam production systems
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