
Stephen Kwasi NutsugahCouncil for Scientific and Industrial Research · Directorate
Stephen Kwasi Nutsugah
PhD
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40
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Introduction
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Publications
Publications (40)
Insecticide application is the recommended practice for control of insect pests on cowpea (Vigna unquiculata (L) Walp). However, these have negative effects on humans and the environment, apart from being costly for resource-poor farmers. This study aimed at identifying appropriate combinations of cultivar and insecticide spraying times for the man...
This study evaluated grain yield performance, stability and agronomic nitrogen-use efficiency (AE) of twelve maize populations under three nitrogen (N) rates at two locations in the Guinea and Sudan savannah zones of Ghana in 2014 and 2015. The N rates used were 0, 30, and 90 kg N ha−1. Computations were made for grain yield and AE. Populations × n...
This study was aimed at producing healthy yam tubers as a step towards extending its shelf-life using a participatory research programme. Four pre-planting treatments of yam setts in combination with two post-planting treatments were evaluated. These treatment combinations were evaluated in integration with best agricultural practices such as site...
Though several maize {Zea mays) varieties and hybrids have been developed over the last three decades in Ghana, farmers still face challenges of access to quality seed. This study examined the influence of current seed programme of maize and suggests interventions to ameliorate the constraints of farmers in relation to seed security. The research t...
Frafra potato (Solenostemon rotundifolius Poir.)is one underutilized crop species which is critical to improving food security in the Upper East and Upper West Regions of Ghana. Food dishes of Frafra potato (FP) are a delicacy particularly for children. The tubers have high marketing potential even compared with its counterpart, sweet potato. Howev...
Soil arthropod pests are important constraints to peanut production in Ghana. Surveys of peanut fields were conducted from 2003–2005 to identify and estimate densities of key soil arthropod pests, and also to quantify their damage to peanut in the three regions (Northern, Upper East and Upper West) of northern Ghana. The main soil pests were termit...
Sweet potato is an important crop in the upper-east region of Ghana due to its adaptive ability on poor quality soils. It is a predominant snack and lunch for children during the peak harvest period, around October-February. This study assessed the influence of some sensory descriptors, with emphasis on the emerging influence of colour, on consumer...
A two-year emergency rice (Oryza sativa L.) initiative project was launched in 2009 in response to the global rice crisis in 2008. The objective of this initiative in Ghana was to increase rice productivity in order to improve food security. Project activities included seed fairs, dissemination of information on improved production technologies usi...
A two-year emergency rice (Oryza sativa L.) initiative was launched in 2009 in response to the global rice crises in 2008. The objective of this initiative in Ghana was to increase rice productivity in order to improve food security. Project activities included planning sessions, demonstrations, training courses and community seed production. The p...
In this study, host-specific forms of the blast pathogen Magnaporthe oryzae in sub-Saharan Africa (SSA) were characterised from distinct cropping locations using a combination of molecular and biological assays. Finger millet blast populations in East Africa revealed a continuous genetic variation pattern and lack of clonal lineages, with a wide ra...
To address the poor seed viability problem of pearl millet in Ghana, the influences of time of harvesting, some seed physical characteristic and moisture content relations on viability were evaluated. Harvesting was done on day 1,3, 5, 7 and 14 from the physiological maturity or the hard-dough stage. The seeds were also fractionated into <2, >2 and...
The present study describes the outputs of a collaborative research programme funded by the UK`s Department for International Development-Crop Protection Program to investigate the genetic (lineages) and pathogenic (pathotypes) diversity of the blast fungus populations and characterize the key sites suitable for resistance screening. Seventy-one Ma...
Field survey, screening trials and laboratory investigation were used to determine the prevalence of sorghum diseases in the major sorghum-growing climatic zones (Sudan,
northern and southern Guinea savanna). Farmers\' fields were surveyed in 1997. Ten sorghum entries were evaluated under natural field conditions in 1997 and 1998 at Damongo for the...
Production of a host-specific toxin by Alternaria tenuissima, the cause of pigeon pea leaf spot, was investigated in spore-germination fluids (SGF). The SGF selectively induced necrosis on pigeon pea leaves in a deteched leaf assay. Necrotic lesions were observed when a toxin from SGF was applied onto detached young leaves of the pigeon pea cultiva...
In west and central Africa, sorghum (Sorghum bicolor) and pearl millet (Pennisetum glaucum) are subject to attack by numerous diseases and the witch weed, Striga hermonthica. The most damaging diseases on sorghum are anthracnose (caused by Colletotrichum graminicola) and grain mold caused by a complex of fungi, while on pearl millet, downy mildew (...
Materials and Methods
Results and DiscussionAcknowledgementsReferences
Forty pearl millet germplasms consisting of traditional and improved open pollinated varieties, hybrids, and inbreds were selected to represent diversity for grain yield or quality, fertility restoration for specific cytoplasms, resistance to diseases or pests, variation in height and maturity, and origin. Evaluations were conducted in field trials...
Early leaf spot ( Cercospora arachidicola ) and late leaf spot ( sporidium personatum ) are major limiting factors to groundnut productivity in northern Ghana. Fourteen groundnut entries were evaluated for two seasons (2003 and 2004) at Nyankpala with and without tebuconazole fungicide application. The objective of this study was to determine the y...
Early leaf spot ( Cercospora arachidicola ) and late leaf spot ( Cercosporidium personatum ) of peanut ( Arachis hypogaea ) are a major constraint to peanut production in northern Ghana. To develop suitable disease management options, field trials were conducted from 2003 to 2005 at Nyankpala, Yendi and Damongo to compare the efficacy of the fungic...
Surveys were conducted in farmers' fields, participatory varietal selection (PVS) nurseries and researchers' fields during 2000-2002 cropping seasons to assess the incidence of rice blast (Pyricularia oryzae) in Ghana. Screenhouse artificial inoculation studies and field trials were also carried out on some of the rice varieties to assess their res...
Seed-borne fungi of 152 seed samples of sorghum, pearl millet, rice, maize, groundnut, cowpea, okra, pepper, watermelon, tomato and garden eggs were assessed for fungal infection using the blotter method. Twenty genera and 32 species of fungi were recorded from the seed samples. One hundred and three sorghum samples examined were infected by 24 fun...
Materials and Methods
Results and DiscussionAcknowledgementsReferences
In West Africa, the demand for rice is growing faster than any other major staple food. Rice constitutes a major source of calories for the rural and urban poor and is grown in approximately 4.3 million ha in 17 West African countries — member states of West Africa Rice Development Association (WARDA). Annual production in the region is approximate...
Rice is an important food and cash crop in Ghana. Domestic consumption is rapidly increasing and likely to reach 762,000 mt of paddy equivalent in 2006. The current production barely exceeds 221, 300 mt (PPMED, 1995). Large scale mechanised rice production prevalent during the 1970s collapsed once Government subsidies were withdrawn. However, small...
During a regular survey of diseases in farmers' fields of onion (Allium cepa L.) in the Upper East Region of Ghana in March 1997, bulbs infected with white rot disease were collected for identification. A portion of the white mycelium present on the onion scale was cultured on potato dextrose agar (PDA). After 2 days of incubation, white fluffy myc...
Alternaria tenuissima affecting pigeon pea produces a host-specific toxin in spore germination fluids with selective toxicity to susceptible pigeon pea cultivars/lines. The primary site of action by the toxin in host cells was examined by ultrastructural observation and morphometry. The first toxin-induced change in ultrastructure of susceptible le...