Journal and Journal Articles: Recent submissions

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    • Quality requirements in natural enemies used for inoculative release: Practical experience from a successful biological control programme 

      Neuenschwander, P.; Haug, T.; Ajounu, O.; Davis, H.; Akinwumi, B.; Madojemu, E. (1989)
      During the past six years, the South-American encyrtid wasp Epidinocarsis lopezi (De Santis) was released from the ground and from the air in about 100 areas in Africa for the biological control of the cassava mealybug (CM) Phenacoccus manihoti Mat.-Ferr. It was established in all release sites and, in 1988, occurred in 18 African countries over 1.5 mio. km2. Its efficiency in permanently reducing CM populations has been documented. E. lopezi was reared on its original host plant, cassava, and on ...

    • Chemical and sensory properties of analogue rice produced from maize grits and high quality cassava flour blends 

      Karim, O.R.; Olapade, G.; Awoyale, W.; Maziya-Dixon, B.; Oyeyinka, S.; Olawuyi, I. (2017)
      In order to reduce the large quantity of rice imported into Nigeria on a yearly basis, there is the need to get an alternative food that resembles rice to meet domestic requirement and food diversification. This work was therefore designed to determine the chemical, functional and sensory properties of analogue rice (ARC) produced from five blends of maize grits and high quality cassava flour (HQCF) using standard methods. The sensory qualities and consumer acceptability of the ARC were compared ...

    • Using a participatory theory driven evaluation approach to identify causal mechanisms in innovation processes 

      Blundo‐Canto, G.; Devaux‐Spatarakis, A.; Mathé, S.; Faure, G.; Cerdan, C. (2020-10)
      Applied agricultural research institutes play different roles in complex agricultural innovation processes, contributing to them with other actors. To foster learning and usable knowledge on how research actions influence such lasting innovation processes, there is a need to identify the causal mechanisms linking these actions and the effects of the changes they enable. A participatory, theory‐driven, ex‐post evaluation method, ImpresS, was developed by the French Agricultural Research Center for ...

    • Physiological response of soybean [Glycine max L. Merril] genotypes to drought-induced stress: preliminary screening for drought under south sudan agro-ecological (Ironstone/Mountains) conditions 

      Gama, P.B.S.; Vuga, A.J.; Chigeza, G. (2020-03)
      Drought stress is a major environmental factor that adversely limits the growth and the production of crops. In order to screen 18 soybean genotypes, an experiment was conducted in University of Juba, (CNRES), Department of Agricultural Sciences Experimental Unit with an objective of screening 18 soybean accessions/genotypes for drought tolerance at two separate experiments (non-drought stress and drought stress sites) based on randomized complete block design (RCBD) with three replications. The ...

    • Quantification of the aflatoxin biocontrol strain Aspergillus flavus AF36 in soil, and nuts and leaves of pistachio by real-time PCR 

      Garcia-Lopez, M.T.; Luo, Y.; Ortega-Beltran, A.; Jaime, R.; Moral, J.; Michailides, T. (2020-10)
      The species Aspergillus flavus and A. parasiticus are commonly found in the soils of nut-growing areas in California. Several isolates can produce aflatoxins that occasionally contaminate nut kernels conditioning their sale. The strain AF36 of A. flavus, which does not produce aflatoxins, is registered as a biocontrol agent for use in almond, pistachio, and fig crops in California. After application in the orchards, AF36 displaces aflatoxin-producing Aspergillus spp. and thus reduces aflatoxin ...

    • Variability of provitamin A carotenoids in plantain: influence of cultivar, bunch type, maturation stage, and location 

      Udomkun, P.; Masso, C.; Swennen, R.; Assfaw Wossen, T.; Amah, D.; Fotso Kaute, A.; Lienou, J.; Adesokan, M.; Njukwe, E.; Vanlauwe, B. (2020)
      In this study, the effect of ripening stage (R), cultivar (C), bunch type (T), and location (L) on the variability of provitamin A carotenoids (pVACs) in 16 plantain cultivars grown in Cameroon and Gabon was investigated. For the sixteen plantain cultivars, fruits were collected at stages 1 (unripe), 5 (ripe), and 7 (overripe) from three different bunch types (French, False Horn, and True Horn) across 13 locations in Cameroon and Gabon. For all cultivars, the highest concentration of carotenoids ...

    • Identification of early and extra-early maturing tropical maize inbred lines resistant to Exserohilum turcicum in sub-Saharan Africa 

      Badu-Apraku, B.; Bankole, F.A.; Ajayo, B.S.; Fakorede, M.A.B.; Akinwale, R.O.; Talabi, A.O.; Bandyopadhyay, R.; Ortega-Beltran, A. (2021-01)
      Northern corn leaf blight (NCLB) incited by the fungus Exserohilum turcicum is a foliar disease that significantly limits maize production and productivity in West and Central Africa (WCA), particularly in the mid-altitudes but during the last decade it has become a menace in lowland agro-ecologies. The most economical and environmentally friendly disease management strategy is the cultivation of maize varieties resistant or tolerant to NCLB. However, no early maturing (EM) and extra-early maturing ...

    • Living income benchmarking of rural households in low-income countries 

      van de Ven, G.W.; de Valença, A.; Marinus, W.; de Jager, I.; Descheemaeker, K.K.; Hekman, W.; Mellisse, B.T.; Baijukya, F.; Omari, M.; Giller, K. (2020)
      The extreme poverty line is the most commonly used benchmark for poverty, set at US$ 1.90 by the World Bank. Another benchmark, based on the Anker living wage methodology, is the remuneration received for a standard work week necessary for a worker to meet his/her family’s basic needs in a particular place. The living wage concept has been used extensively to address incomes of plantation workers producing agricultural commodities for international markets. More recently intense discussion has ...

    • Variability of provitamin A carotenoids in plantain: influence of cultivar, bunch type, maturation stage, and location 

      Udomkun, P.; Masso, C.; Swennen, R.; Wossen, T.; Amah, D.; Fotso, A.; Lienou, J.; Adesokan, M.; Njukwe, E.; Vanlauwe, B. (2020-12)
      In this study, the effect of ripening stage (R), cultivar (C), bunch type (T), and location (L) on the variability of provitamin A carotenoids (pVACs) in 16 plantain cultivars grown in Cameroon and Gabon was investigated. For the sixteen plantain cultivars, fruits were collected at stages 1 (unripe), 5 (ripe), and 7 (overripe) from three different bunch types (French, False Horn, and True Horn) across 13 locations in Cameroon and Gabon. For all cultivars, the highest concentration of carotenoids ...

    • Tectonics, climate and the diversification of the tropical African terrestrial flora and fauna 

      Couvreur, T.L.P.; Dauby, G.; Blach-Overgaard, A.; Deblauwe, V.; Dessein, S.; Droissart, V.; Hardy, O.J.; Harris, D.J.; Janssens, S.B.; Ley, A.C.; Mackinder, B.A.; Sonké, B.; Sosef, M.S.M.; Stévart, T.; Svenning, J.C.; Wieringa, J.J.; Faye, A.; Missoup, A.D.; Tolley, K.A.; Nicolas, V.; Ntie, S.; Fluteau, F.; Robin, C.; Guillocheau, F.; Barboni, D.; Sepulchre, P. (2020)
      Tropical Africa is home to an astonishing biodiversity occurring in a variety of ecosystems. Past climatic change and geological events have impacted the evolution and diversification of this biodiversity. During the last two decades, around 90 dated molecular phylogenies of different clades across animals and plants have been published leading to an increased understanding of the diversification and speciation processes generating tropical African biodiversity. In parallel, extended geological ...

    • Investigating manual sprout removal in stored yam: effect of tuber sizes on some physicochemical properties 

      Etudaiye, H.A.; Uvere, P.O.; Rees, D.; Abayomi, L.; Westby, A.; Maroya, N.G.; Ukpabi, U.J. (2020)
      The study focused on manual sprout removal and effect of tuber sizes on some physicochemical properties of the stored yams. Yam variety, Ameh (Dioscorea rotundata) with different tuber sizes ≤ 0.5 Kg, 0.6-0.9 Kg and ≥ 1.0 Kg for small (SS), medium (MS) and big(BS) sizes, respectively, were used. The primary nodal complex (PNC) was removed using three methods: hand picking, half cutting and full cutting. Tubers were stored on shelves for 16 weeks in a yam storage laboratory at National Root Crops ...

    • Validation of a roadmap for mainstreaming nutrition-sensitive interventions at state level in Nigeria 

      Ezekannagha, O.; Drimie, S.; Von Fintel, D.; Maziya-Dixon, B.; Mbhenyane, X. (2020)
      Background National programs are often developed with little consideration to the sub-national local factors that might affect program success. These factors include political support, capacity for implementation of program and variation in malnutrition indices being tackled. State context factors are evident in the distribution of malnutrition (e.g. high prevalence or gap among Local Government Areas), in the implementation of nutrition-sensitive interventions (e.g. access to early childhood ...

    • Antagonistic effects of biocontrol agents against Phytophthora infestans and growth stimulation in tomatoes 

      Kariuki, W.G.; Mungai, N.W.; Otaye, D.O.; Thuita, M.; Muema, E.; Korir, H.; Masso, C. (2020)
      Late blight disease is a major cause of economic losses in tomato (Lycopersicon esculentum L.) production in eastern Africa. The objective of this study was to evaluate the efficacy of Trichoderma species in controlling late blight disease and their role on the growth of tomato. Trichoderma asperellum and T. harzianum were isolated from two commercial products containing the antagonistic species. Culture-based and molecular approaches, genomic DNA isolation and amplification, using ITS1 and ITS4 ...

    • Nitrogen fertilizer equivalence of black soldier fly frass fertilizer and synchrony of nitrogen mineralization for maize production 

      Beesigamukama, D.; Mochoge, B.; Korir, N.; Musyoka, M.W.; Fiaboe, K.; Nakimbugwe, D.; Khamis, F.M.; Subramanian, S.; Dubois, T.; Ekesi, S.; Tanga, C.M. (2020)
      The use of black soldier fly frass fertilizer (BSFFF) is being promoted globally. However, information on nitrogen (N) fertilizer equivalence (NFE) value and synchrony of N mineralization for crop production remains largely unknown. Comparative studies between BSFFF and commercial organic fertilizer (SAFI) were undertaken under field conditions to determine synchrony of N release for maize uptake. The BSFFF, SAFI, and urea fertilizers were applied at the rates of 0, 30, 60, and 100 kg N ha−1. The ...

    • Introgression breeding in cowpea [Vigna unguiculata (L.) walp.] 

      Boukar, O.; Abberton, M.; Oyatomi, O.; Togola, A.; Tripathi, L.; Fatokun, C. (2020)
      The narrow base of genetic diversity characteristic of cowpea can be attributed to it being self-pollinating, evolving from narrow wild germplasm and exhibiting very limited gene flow between wild and cultivated types. Backcrossing to introduce simply inherited desirable traits and utilization of improved breeding lines and varieties as parents in crossing programs further narrowed the genetic base of cowpea varieties. In most cowpea breeding programs, genes for resistance and market traits were ...

    • Genotyping-by-sequencing to unlock genetic diversity and population structure in white yam (dioscorea rotundata poir.) 

      Bhattacharjee, R.; Agre, A.P.; Bauchet, G.; De Koeyer, D.; Lopez-Montes, A.; Kumar, P.L.; Abberton, M.; Adebola, P.O.; Asfaw, A.; Asiedu, R. (2020)
      White yam (Dioscorearotundata Poir.) is one of the most important tuber crops in West Africa, where it is indigenous and represents the largest repository of biodiversity through several years of domestication, production, consumption, and trade. In this study, the genotyping-by-sequencing (GBS) approach was used to sequence 814 genotypes consisting of genebank landraces, breeding lines, and market varieties to understand the level of genetic diversity and pattern of the population structure among ...

    • Nutritional, texture, and sensory properties of composite biscuits produced from breadfruit and wheat flours enriched with edible fish meal 

      Bakare, A.H.; Adeola, A.A.; Otesile, I.; Obadina, A.O.; Afolabi, W.A.; Adegunwa, M.O.; Akerele, R.A.; Bamgbose, O.O.; Alamu, E.O. (2020)
      This study aimed to develop biscuits with improved nutritional contents using edible fish meal from catfish as the source of macro‐ and micronutrient enrichment while trying to reduce the input of wheat flour in biscuit‐making process. The biscuit was produced using edible fish meal (EFM: 0%–40%) from catfish, improved quality breadfruit (IQBF: 0%–60%), and wheat flours (WF: 0%–40%). Macro (crude protein, fat, fiber, ash, and carbohydrate)‐ and micro (calcium, magnesium, potassium, phosphorus, ...

    • Near-infrared spectroscopy applications for high-throughput phenotyping for cassava and yam: a review 

      Alamu, E.O.; Nuwamanya, E.; Cornet, D.; Meghar, K.; Adesokan, M.; Tran, T.; Belalcazar, J.; Desfontaines, L.; Davrieux, F. (2020)
      The review aimed to identify the different high‐throughput phenotyping (HTP) techniques that used for quality evaluation in cassava and yam breeding programmes, and this has provided insights towards the development of metrics and their application in cassava and yam improvements. A systematic review of the published research articles involved the use of NIRS in analysing the quality traits of cassava and yam was carried out, and Scopus, Science Direct, Web of Sciences and Google Scholar were ...

    • In-situ chlorophyll fluorescence and related growth of white Guinea yam at different ages 

      Aighewi, B.A.; Ekanayake, I.J. (2004)
      Leaf chlorophyll photochemical attributes and growth of two cultivars of white Guinea yam (Dioscorea rotundata) were examined. The photochemical efficiency (Fv/Fm ratio) of cv. Pepa was significantly higher than that of cv. Abi at 10, 14 and 22 weeks after transplanting (WAT). The peak photosynthetic efficiency period for both cultivars was at 18 WAT. Leaf area indices and crop growth rate were greater for Pepa than Abi, as was the leaf transpiration rate. During peak growth periods Pepa was less ...

    • End-user preferences for plantain food products in Nigeria and implications for genetic improvement 

      Amah, D.; Stuart, E.; Mignouna, D.; Swennen, R.; Teeken, B. (2020)
      Plantain is an important food security crop for farming households in Nigeria. This study investigates the relative importance of plantain food products and their quality descriptors from the perspective of farmers in Southern‐Nigeria, to inform end‐user oriented and socially inclusive breeding strategies that drive hybrid adoption. Surveys were conducted in twelve rural communities in three states in the plantain belt of Nigeria, consisting of key informant interviews, sex‐disaggregated focused ...