Journal and Journal Articles: Recent submissions

Now showing items 1421-1440 of 5157

    • Field distribution of banana weevil (Cosmopolites sordidus (Germar) adults in cooking banana stands in Uganda 

      Gold, C.S.; Night, G.; Ragama, P.E.; Kagezi, G.H.; Tinzaara, W.; Abera, A.M. (2004)
      The banana weevil, Cosmopolites sordidus (Germar), is a nocturnal insect that is not readily observed in banana fields. Knowledge on its distribution is essential for the design of management strategies that target the adult stage. Marked weevils were released into seven-year-old banana plots. Ten days later the plots were systematically sampled for adult weevils by first removing the banana leaf mulch and residues, searching subsections of the soil to depths of 3 and 25 cm and, finally, removal ...

    • Recolonization by nematodes of hot water treated cooking banana planting material in Uganda 

      Elsen, A.; Goossens, B.; Belpaire, B.; Neyens, A.; Speijer, P.; De Waele, D. (2004)
      In East Africa, the cooking bananas (Musa spp., AAA group, subgroup Matoke) are the major food crop. Yields are decreasing due to increasing damage caused by a complex of pests and diseases, including plant-parasitic nematodes. Planting of infected material is the principle means of dispersal for these nematodes. An option to control the nematodes in planting material is hot water treatment but the benefits depend on the rate of recolonisation. Therefore, on-farm trials were carried out at five ...

    • Effects of droughtscreening methodology on genetic variances and covariances in Pool 16 DT maize population 

      Badu-Apraku, B.; Fakorede, M.A.; Menkir, A.; Kamara, A.; Adam, A. (2004)
      North Carolina Design I (NCD I) progenies derived from Pool 16 DT, a white, dent, early maturing, drought-tolerant and streak resistant tropical maize (Zea mays L.) population, were evaluated in the 1995/96 and 1997/98 dry seasons, using two sites each season in Côte d'Ivoire. In all sites, the crop was irrigated from planting to about 2 weeks before anthesis; irrigation was discontinued thereafter for the rest of the season in one site (Soumis) in 1995 and both sites (Ferkessédougou and Sinematialli) ...

    • Status of cassava mosaic virus diseases and cassava begomoviruses in subSaharan Africa 

      Atiri, G.I.; Ogbe, F.O.; Dixon, Alfred G.O.; Winter, S.; Ariyo, O. (2004)
      The current status of cassava Begomoviruses, the most serious constraint to the production of cassava, a major staple food crop in sub-Saharan Africa, is reviewed in relation to their distribution, effects, etiology, and epidemiology. It is concluded that control of the diseases would continue to depend on integrated management involving cultural practices and use of resistant cultivars. Current trends in diagnosis and control, including the production of transgenic plants, selection for resistance ...

    • Comparative effects of explant source and genotype on in vitro tuberization in Dioscorea alata and D. rotundata 

      Balogun, M.O.; Ng, S.Y.; Shiwachi, H.; Ng, N.Q.; Fawole, I. (2004)
      Single node cuttings of two genotypes each of Dioscorea alata and D. rotundata from both plants grown in screen houses and in vitro plantlets were cultured in a tuberization medium. The screen house explants had significantly higher plantlet tuberization and primary nodal complex formation, and more tubers and primary nodal complexes per plantlet than in vitro explants, whereas in vitro explants performed better only in nodes per plantlet. It appears that in vitro tuberization is explant‐, species‐ ...

    • Sclerotinia stem rot caused by Sclerotinia Sclerotiorum on soybeans in Nigeria 

      Akem, C.N.; Dashiell, Kenton E. (1992)
      In Aug. 1990, S. sclerotiorum was isolated from soyabean cultivars TGx 1440-1E and TGx 1627-3F at Bukuru, Plateau, Nigeria. Disease symptoms are described. This is the first report of Sclerotinia stem rot of soyabean in Nigeria and West Africa.

    • Library networks and resouces sharing in Nigeria 

      Ubogu, F.N.; Okoh, M.I.; Alimole, A.L.; Eyitayo, O.T. (1992)

    • Merging biotechnology with biological control: banana Musa tissue culture plants enhanced by endophytic fungi 

      Paparu, P.; Dubois, T.; Athman, S.; Kapindu, S.; Coyne, D.; Gold, C.; Adipala, E.; Mukwaba, E. (2004)
      Among the major constriats to highland cooking banana (Musa spp. AAA-EA) production in Uganda is the high pests infestation levels. Most important are the banana weevil cosmopolites sordidus and a complex of plant parasitic root nematodes of which Radopholus similis is the most important. Clean planting material, such as tissue culture derived plants, is now being promoted in Uganda for establishments for new fields, although pest re-infestation remains a vital concern. Fungal endophytes are ...

    • Leasing loss of calcium, magnessium potassium and nitrate derived from soil, and fertilizers as influence by urea applied to undisturbed lysemeters southeast Nigeria 

      Wong, M.T.F.; Van der Kruijs, A.C.M.B.; Juo, A.S.R. (1992)

    • Yield losses due to stalkeyed fly (SEF) in Nigeria 

      Joshi, R.C.; Angela, C.J.; Ukwungwu, M.N. (1992)

    • Largescale library automation: an African success story 

      Lawani, S.M.; Azubuike, A.A.; Ibekwe, G.O. (1992)

    • Outbreak of red leaf blotch caused by Dactuliochaeta glycines, on soybeans in Nigeria 

      Akem, C.N.; Akueshi, C.O.; Uwala, O.A.; Dashiell, Kenton E. (1992)
      Red leaf blotch, caused by Dactuliochaeta glycines (R.B. Stewart) Hartman & Sinclair (2) (= Pyrenochaeta glycines R.B. Stewart), was observed on soybeans (Glycine max (L.) Merr.) at Bukuru, near Jos in the state of Plateau, Nigeria, in 1990. Over 80% of the plants in the 4¬ha nonirrigated, sandy loam field nursery showed symptoms. Dark red to brown lesions on primary leaf veins eventually enlarged and coalesced to form irregular blotches 5¬10 mm in diameter. Most blotches had ash¬gray centers with ...

    • Pyrenochaeta glycines, a threat to soybean cultivation in Nigeria 

      Akem, C.N.; Akueshi, C.O.; Agina, S.M.; Dashiell, Kenton E. (1992)

    • Stalkeyed fly (SEF) damage to lowland irrigated rices in Nigeria 

      Joshi, R.C.; Ukwungwu, M. (1992)

    • Macrophomina phaseolina on the tropical cover crops Mucuna pruriens var. utilis 

      Berner, D.K.; Killani, A.S.; Aigbokhan, E.; Couper, D.C. (1992)
      During the rainy season of 1991, severely reduced plant stands and severely stunted plants were observed in several fields of the cover crop Mucuna pruriens (L.) DC. var. utilis (Wallich ex Wight) Baker ex Burck at the International Institute of Tropical Agriculture in Ibadan, Nigeria. Initial outbreak of symptoms followed a brief dry period, and subsequently more than 75% of the crop was lost. When the sites were replanted, the mucuna was again severely affected, although there was no dry period. ...

    • Evaluation of soybean cultivars for field resistance to frogeye leaf spot and bacterial pustule in Nigeria 

      Akem, C.N.; Dashiell, Kenton E. (1992)

    • Occurance of the larger grain borer, Prostephanus truncatus, in Burkina Faso 

      Bosque-Perez, N.A.; Traore, S.; Markham, R.H.; Fajemisin, J.M. (1992)

    • Spatial distribution of Rastrococcus invadens Williams (Hom., Pseudococcidae) in mango trees 

      Boavida, C.; Neuenschwander, P.; Schulthess, F. (1992)
      The spatial dispersion pattern and the intracanopy distribution of the mango mealybug, Rastrococcus invadens Williams, were assessed during one year in a small mango plantation, in order to develop sampling plans and facilitate sampling in mango trees. Mean number of mango mealybugs per leaf differed significantly between trees for most sampling dates, between old and young leaves, and between geographical quadrants. A second one‐time assessment of the intracanopy distribution of the mango mealybugs ...

    • Some studies on cowpea aphidborne mosaic and pea seedborne mosaic potyviruses in Nepal 

      Dahal, G.; Albrechtsen, S.E. (1996)
      Various virus‐like symptoms were recorded on field‐grown cowpea(Vigna unguiculataL. Walp) and pea(Pisum sativumL.) during 1989–1990 at the experimental farm of the Institute of Agriculture and Animal Sciences (IAAS), Rampur, Chitwan valley, in the central terai plains of Nepal. The causal agent(s) causing narrow and/or curled leaves, and stunting of pea, and prominent mosaic and vein banding of cowpea were transmitted by both aphids and sap inoculations. Electron microscopic examination of leaf ...

    • Development in cowpea (Vigna unguiculata); l: the influence of temperature on seed germination and emergence 

      Craufurd, P.Q.; Ellis, R.H.; Summerfield, R.J.; Menin, L. (1996)
      The base (Tb), optimum (To) and ceiling (Tce) temperature for 50% seed germination and seedling emergence, and the thermal time at sub-optimal temperatures (θ1), were examined in experiments with a range of cowpea genotypes from different habitats and latitudes. There was substantial genotypic variation in seed germination for Tb and To, but not for Tce. There was no evidence that genotypes from semi-arid habitats had higher values of To or Tce, but estimates of Tb for seed germination were related ...