Proceedings of the 6th Triennial Symposium ISTRC-AB Oct 1995, Lilongwe, Malawi

No Title Author Page  
1 Opening/Welcome addresses 17-20
2 keynote address 21-23
3 Cassava:Africa`s cinderella crop N.D.Hahn 24-27  
4 Cassava and sweet potatoes for poverty alleviation in Malawi A.S.Kumwenda 28-30
5 PROAMYL (Promotion des amylaces tropicaux);acquis du CIRAD et de I`ORSTOM D.Griffon et C.Brabet 31-37
6 Transfer of root crop technology for alleviation of poverty;the contribution of Shell,Nigeria P.I.Osagie 38-41
7 Strategies for enhancing the availability of roots crops planting material to smallholder farmers in Malawi J.H.Luhanga 42-43
8 Diseases and nematodes of cassava and sweet potato in Malawi A.T.Daudi 44-46
9 Traning for root and tuber crop research and production in Africa M.T.Ajayi,J.L.Gulley and I.R.Obubo 47-50
10 Multiplication and distribution of cassava and sweet potato planting material.lessons from Malawi and implications for the region J.Mkumbira 51-54
11 ODA`s crop post-harvest research programme in Africa-a revised strategy for sustainable development N.Poulter 55-56
12 The potential role of root crops in Swaziland M.H.Nxumalo 57-61
13 Techniques and methodologies of cassava and sweet potato multiplication I.R.M.Benesi,P.J.Mtambalika and J.Mkumbira 62-64
14 Inter-relationships between yield components and cyanogenic potential and their influence on selection B.W.Khizzah,J.B.A.Whyte and R.Van der Grift 65-68
15 Experience faite par le centre national de technologies alimentaires en conception,adaptation et fabrication de petits equipements alimentaires Z.Irabahaye 69-73
16 Artisinal production of maltose J.E.Cecil 74-75
17 Dry matter production and partitioning in cassava (Manihot esculenta) intercropped with maize or groundnuts D.S.O.Osiru and S.K.Hahn 76
18 The use of needs assessment methodologies to focus technical interventions in root and tuber crop post-harvest systems:a case study to improve the marketing and post-harvest handling of cassava entering Dar-es-Salaam,Tanzania G.T.Ndunguru,F.Modaha,R.D.Bancroft,P.D.Digges,U.Kleih,

A.Westby and F.Mashamba

19 Yam-soya bean intercropping in the guinea savanna zone of north Ghana A.Y.Alhassan 83-84
20 Potentials of root crop residues for livestock feeding in tropical Africa O.O.Tewe 85-87
21 SARRNET:cassava and sweet potato network for mitigation against drought and for food security in SADC region J.M. Teri,I.J.Minde,J.Mkumbira & S.Sam 88-94
22 Cassava and sweet potato processing and utilization in Tanzania A.Kapande,R.Kapinga and E.Rwiza 95-101
23 The role of root crops in poverty alleviation in Africa F.Nweke 102-109
24 Collaborative study of cassava in Africa;some findings in Malawi J.Mkumbira 110-112  
25 Cassava processing as a determinant of commercialization and farmers` varietal requirements in Ghana J.A.Otoo,R.Al-Hassan,A.F.K.Kissiedu and A.Y.Alhassan 113-114  
26 Quelques causes du faible rendement du manioc en racines tubereuses au Zaire D.Lutete,M.Bidiaka et K.Landu 115-117
27 Some determinants of cassava yield in Nigeria O.Ajobo and B.O.Ugwu 118-120  
28 Comparative study of production labor for selected  tropical food crops(cassava,yam,maize and upland rice) M.Tshiunza 121-125
29 The viruses and virus diseases of cassava  in Africa:what is the magnitude of the problem? J.M.Thresh,G.W.Otim-Nape and D.Fargette 126-129  
30 Biological control as an integrated pest management(IPM) strategy to control caassava mealybug(Phenacoccus manihoti)Matile-ferrero(Hemiptera: Pseudococcidae)and cassava green mite(Mono-nychellus tanajoa)(Bondar)(Acari:tetranichidae) in Zambia. M.K.Sakala,J.Chakupurakal,C.Malambo,M.Mebelo and S.Kunda 130-135  
31 Identification and characterization of Fusarium spp.associated with cassava chips W.Msikita,J.S.Yaninek,J.Green,M.Ahounou,R.Fagbemissi and F.Hountondji 136-139  
32 A survey of weeds of cassava(Manihot esculenta Crantz)in Salima district in central Malawi B.C.Munthali 140-142  
33 Description d`une methode d`evaluation du pouvoir pathogene des isolats de Armillaria heimii,agent pathogene du pourridie du manioc C.Makambila et V.U.Loubacky 143-145
34 The pathogenicity of Neozygites cf.Floridana(Zygomycetes:entmophthorales) to the cassava green mite,Mononychellus tanajoa(Acari: tetranychidae) G.I.Oduor,J.S.Yanineke and Moraes 146-149  
35 Effect of soil fertility and planting time on the incidence of cassava green mite (CGM (Mononychellus tanajoa Bondar) M.Gethi and A.S.Aziz 150-152  
36 Outbreak of a new tuberous root mealybug(Stictococcus vaysierier)(Homoptera:Stictococcidae)of cassava(Manihot esculenta Crantz) in Cameroon J.M.Ngeve 153-156  
37 Rate of re-infection and prospects for control of African cassava mosaic disease in Southern Africa. A.Muimba-Kankolongo,J.M.Teri,N.M.Mahungu,M.C.M.Porto,

C.Jerico,J.Mukumbira,A.Zacaria and E.Kanju

38 Characterization of isolates of Colletotrichum gloeosporioidesPenz.f.sp.manihotis from susceptible cassava cultivars in Cameroon D.N.Akonumbo and J.M.Ngeve 163-166  
39 Importance de l`acariose et mécanismes de résistance des différentes variétés de manioc contre l`acarien vert. P.Ndayiragije 167-175
40 The role of amino acids in field resistance of cassava to green spider mite(Mononychellus tanajoa Bondar) E.N.Nukenine,A.T.Hassan and A.G.O.Dixon 176-182  
41 Rhizosphere microorganisms of cassava and their effects on plant health A.F.Sanusi and T.Ikotun 183-189  
42 Mycorrhizal inoculation and mulching applications for continuous cassava production in alley cropping systems O.Osonubi,I.E.Okon,O.Fagbola and I.J.Ekanayake 190-193  
43 Performance in three agroecologies of virus-tested cassava genotypes derived from meristem culture A.Akano,S.Ng R.Asiedu and G.Atiri 194-197  
44 An overview of the present situation of cassava diseases in West Africa K.Wydra and W.Msikita 198-206  
45 Evaluation of newly improved cassava varieties for Nigeria ecologies E.C Nnodu,J.E.Okeke and A.G.O.Dixon 207-215  
46 Genotype x environment interaction and stability analysis of 10 cassava genotypes evaluated in Ghana R.Sagoe,J.E.Otoo,A.F.K.Kissiedu,J.J.Afuakwa,A.A.Asare-Bediako,

E.Okai,O.O.Okoli and A.G.O.Dixon





A linkage map of cassava(Manihot esculenta Crantz):a genetic tool for the enhancement of virus resistance and culinary qualities of cassava M.Fregene,M.Bonierbale,F.Angel,R.Gomez,F.Rodriguez,M.Maya,

J.Tohme,C.Iglesias,W.Roca,A.G.O.Dixon,G.Thottappilly and M.Quin

48 Les ressources phytogenetiques sur le manioc en republique du Benin:collecte,conservation et utilisation A.O.Sanni 228-230
49 Yield evaluation of cassava clones in Ghana using additive main effects and multiplicative interaction effects(AMMI) model E.Okai.A.F.K.Kissiedu,J.A.Otoo,J.J.Afuakwa,A.Asare-Bediako,A.Missah,R.Sagoe,O.O.Okoil and A.G.O.Dixon 231-235  
50 Diversity of cassava germplasm and morphological characterization in Malawi J.C.Ngoma,N.M. Mahungu,J.Mkumbira and K.L.Salipira 236  
51 Genotype stability analysis and its application to cassava regional trials H.Ojulong,A.G.O.Dixon,P.Ntawuruhunga and G.Ssemakula 237-241  
52 Genetic Variability among cassava genotypes and its growth performance over time P.Ntawuruhunga  H.Ojulong and A.G.O.Dixon 242-248  
53 Characterization morphologique des clones de manioc cultivars en Afrique de l`ouest et du centre(Bénin,Ghana,Nigéria et Cameroun) N.G.Maroya,K.Aihou,K.A.Okeleye,E.Dosoo and A.Tumanteh 249-254
54 Genotype x environment interaction,phenotypic  stability of cassava yields,and heritability estimates for production and pestd resistance triats in Nigeria . R.E.C.Mba and A.G.O. Dixon 255-261  
55 Correlation studies among yield and various stability parameters and an enlarged rank-sum method for identifying high stable cassava clones R.E.C.Mba and A.G.O. Dixon 261-265  
56 Amélioration des cultivars africains de manioc J.Mabanza et J.M.Mingui 266-269
57 Les cultivars Africains de manioc J.Mabanza et J.M.Mingui 270
58 Sustainable root yields and cassava breeding in Africa M.O.Akoroda 271-276  
59 Systeme traditionnel de transformation et utilization du manioc en milieu rural au TChad K.L.Mbailao and M.Koumaro 277-278
60 Biochemical studies of cassava root post-harvest physiological deterioration G.M.O`Brien,J.E.Mayer,A.L.Chavez,O.Orozco,C.C.Wheatley and J.E.Wenham 279-282  
61 Processing of cassava and quality of reconstituted miondo,bobolo and mintumba G.Tiky-Mpondo and N.Mvondo 283-286  
62 Quantitative separation of the products of the reaction of cyancide toxicity research P.N.Okoh and H.Rosling 287-289
63 The importance of cassava as sustenance for Ibadan small-scale gari processors M.O.Sanni,A.O.Sobamiwa,H.Rosling and C.M.Eyinla 290-292  
64 The promotion of cassava as a food industry:case study in Nigeria A.O.Onabolu and M.Bokanga 293-295  
65 An improved acid-hydrolysis method for the determination of total cyanogens in cassava A.R.K.Mhone and J.D.K.Saka 296-299  
66 The human health benefits of research to reduce the hydrogen cyanide potential in cassava cultivars in Africa G.Lubulwa 300-312  
67 Reasons for use of “bitter” cassava-a priority in cassava production in Malawi L.Chiwona-Karltun,T.Tylleskar,H.Rosling,J.Ngoma,N.M.Mahungu and J.Saka 313-314  
68 Cassava processing and dietary cyanide exposure in Tanzania N.V.Mlingi 315-318  
69 Economics of biological control of the cassava mealybug Phenacoccusmanihoti(Mat-Ferr.)(Hom.,Pseudococcidae) in Africa R.P.Schaab,P.Neuenschwander,J.Zeddies and H.R.Herren 319-327  
70 Cassava and wheat consumption in Africa: new opportunities for cassava in the 21st century L.H.Ouraga-Djoussou and M.Bokanga 328-332  
71 A socio-economic study of the adoption and sustainability of improved cassava varieties among resource-poor farmers in south-eastern forest zone of Nigeria C.C.Chinaka,D.O.Chikwendu and G.N.Asumugha 333-336  
72 The national cassava develoment project of Zimbabwe (NCDP) D.Kwenda 337-341  
73 Farmers participatory evalution of post harvest aspect of elite clones in Malawi K.L.Salipira,D.R.Kalua and J.Mkumbira 342
74 An update of Cassava Program in Kenya J.W.Kamau,P.J.Ndolo,A.Mambiri,C.M.Githunguri,S.T.Gichuki,B.A.Bugusu,F.Omari and F.Kusewa. 343-346  
75 Yield of cassava varieties in two agro-ecological zones in coastal region of Kenya T.L.Munga and S.T.Gichuki 347-348  
76 Effects of location and age at harvest on yield and culinary qualities of cassava(Manihot esculenta Crantz) J.M.Ngeve 349-352  
77 Relative effectiveness of sweet potato,melon and pumpkin as live-mulch in cassava M.T.Dahniya and A.Jalloh `353-355
78 The effect of time of intercropping cassava with rice on dry matter partitioning in cassava and total productivity of the intercrops M.T.Dahniya and A.Jalloh 356-358  
79 Influence of storage of cassava planting material on subsequent plant growth and vigor: a preliminary analysis P.Bieler,I.J.Ekanayake and I.N.Kasele 359  
80 Early vegetative growth response of four improved cassava(Manihot esculentaCrantz)clones to varying temperature regimes S.O.Akparobi,I.J.Ekanayake and M.O.Akoroda 360-365  
81 Association among leaf area index,crop growth rate and dry matter partitioning of six cassava genotypes in three diverse agro-ecological zones of Nigeria C.M.Githunguri,I.J.Ekanayake,A.G.O.Dixon and J.A.Chweya 366-374  
82 Growth and yield of three cassava cultivars in an inland valley swamp in Sierra Leone J.B.George,M.T.Lahai,M.T.Dahniya and I.J.Ekanayake. 375-381  
83 Growth rates and yield of three cassava clones on the Njala gravelly upland soils in Sierra Leone J.B.George,M.T.Lahai,M.T.Dahniya and I.J.Ekanayake. 382-387  
84 Influence of planting season on  incidence and severity of African cassava mosaic disease in the sub humid zone of Nigeria E.Okogbenin,M.C.M.Porto and A.G.O. Dixon. 388-392  
85 Evaluation of cowpea varieties for intercropping with cassava in southeast Nigeria J.E.G.Ikeorgu,O.N.Eke-Okoro and S.O.Odurukwe 393-394  
86 Effect of selection of planting materials on performance of cassava in the dry savannas E.Okogbenin,  M.C.M.Porto , C.Iglesias and .J.Ekanayake 395-399  
87 Forage value of cassava foliage:effects of spacing and interval of cutting on yields C.Ebong,Y.K.Baguma,P.Lusembo and J.Kigongo 400-401  
88 Dry season dust alters photosynthetic characteristics of field grown cassava during the dry season into two agroecozones of Nigeria I.J.Ekanayake,U.C.Okarter and M.T.V.Adeleke 402  
89 Preliminary investigations on photosynthetic capacity and nutrient uptake of polyploid cassava(Manihot esculenta Crantz) I.N.Kasele, I.J.Ekanayake and A.G.O.Dixon 403  
90 Cassava biotechnology network,uptake to the ISTRC/AB:network activities and scientific progress A.M.Thro 404-408  
91 Potential of seed storage for long-term conservation of yam germplasm I.O.Daniel,N.Q.Ng and T.O.Tayo 409-411  
92 Importance of Rhizoctonia solani as a pathogen of yam(Dioscorea spp.) in Nigeria T.E.Sangoyomi and N.A.Amusa 412-417  
93 La production et l`utilisation de cossettes d`igname(D.cayenensisrotundata)au Benin: situation actuelle et perspectives P.Vernier et R.Dumont et P.Zohouri 418-423
94 Amélioration des systems traditionnels de conservation de l`igname A.M.Kouakou,R.Dumont et P.Zohouri 424-425
95 Sélection au sein du groupe d`ignames Krenglé(Dioscorea cayenensis-rotundata) G.Tokpa et R.Dumont 426-428  
96 Molecular taxonomy of Guinea yams and their wild relatives H.D.Mignouna,R.Asiedu and G.Thottappilly 429  
97 Les determinants agro-ecologiques et socio-economiques de la production et de l`offre en igname en Cote d`Ivoire P.S.Doumbia 430-434
98 Acclimatization of in vitro yam plantlets:transition from tubes to field S.Y.C.Ng and R.Asiedu 435-438  
99 Distribution and severity of foliar diseases of yam (Dioscorea spp.) in Nigeria K.R.Green 439-444  
100 Preliminary studies of seed yam production from minisetts with different thickness of cortex parenchyma in white yam (Dioscorea rotundata) B.A.Aighewi,M.O.Akoroda and R.Asiedu 445-447  
101 Potential use of aerial tubers for water yam germplasm conservation and production N.Q.Ng 448-449  
102 Assessment of the potential for sweet-potato processed product (dough nuts) for diversified utilisation of sweet potatoes in Uganda C.Owori and V.Hagenimana 450-452  
103 Effect of host resistance and application of cow manure on yield of sweetpotato weevil damage M.J.Muhanna and W.W.Collins 453-456  
104 Sweet potato virus in Uganda and Kenya: results of a survey E.E.carey,S.T.Gichuki,R.O.M.Mwanga,S.Kasule,S.Fuentes,C.Macharia and R.Gibson 457-460  
105 Evaluation of sweetpotato seedling progenies in Kenya,Uganda and Tanzania E.E.carey,S.T.Gichuki,R.O.M.Mwanga,R.Kapinga,P.J.Ndolo and J.W.Kamau 461-465  
106 Evaluation of sweetpotato storage roots for storability at room temperature in Kenya A.W.Kihurani .S.T.Gichuki and E.E Carey 466-467  
107 Chingovwa:a sweet potato variety,emerging as a cash crop in North-Western Zambia R.Namposya 468-470  
108 Multilocational testing of sweet potato clones in Kenya E.E.carey,S.T.Gichuki,P.J.Ndolo J.Ngungi,J.W.Irungu D.K.Maina and J.W.Kamau 471-474  
109 The effect of  watering frequencey on sweet potato fresh vine yield in the lowland and upland(Ipomea batatas Lam.) D.C.Chitundu 475-478  
110 Survey on storage pest complex of dried sweet potato chips in Uganda J.Ambrose-Agona 479-482  
111 Sweet potato consumption and utilization in major sweet potato growing districts of Uganda R.O.M.Mwanga,C.O.P`Obwoya,B.Bashaasha and P.T.Ewell 483-489  
112 Consumer acceptance of boiled sweet potato clones in Kenya J.N.Maling`a,P.J.Ndolo,S.T.Gichuki,V.Hagenimana,E.Carey and G.Maisiba 490-493  
113 Processing characteristics of promising sweet potato clones in Kenya J.N.Maling`a,,S.T.Gichuki,V.Hagenimana,E.Carey and M.A.Oyunga 494-497  
114 Oil content in fried sweet potato processed products V.Hagenimana and M.A.Oyuunga 498-501  
115 The performance of sweet potato(Ipomea batatas L.) and common bean (Phaseolusvulgaris)under the traditional intercropping system in the lowland areas of Uganda C.Ocitti-P`Obwoya 502-511  
116 Postharvest losses and the potential of the pit storage of sweet potato(Ipomeabatatas)in Malawi H.F.Mbeza and M.Kwapata 508-511  
117 Women`s role in local sweet potato crisps processing in Nairobi-Kenya R.W.Gatumbi and V.Hagenimana 512-514  
118 Determinants of sweet potato commercialization in south Nyanza,Kenya J.W.Low 515-523  
119 Storability of sweet potatoes (Ipomoea batatas) under traditional Malawian conditions S.C.M.Munthali 524-527  
120 Sweet potato in Tanzanian farming and food systems R.E.Kapinga,S.C.Jeremiah,R.Kileo and P.T.Ewell 528-534  
121 Nutrient disorders of sweet potato and taro:advances in diagnosis and correction in the Pacific J.N.O`Sullivan,C.J.Asher,F.P.C.Blamey,S.Halavatau and L.G.G.Yapa 535-541  
122 Performance in Ghana (West Africa) of sweetpotato varieties bred and selected in East and Southern Africa environments J.A.Otoo,A.Missah,A.F.K.Kissiedu,J.J.Afuakwa,J.Adu-Mensah,A.K.Danso,E.Okai,A.Asare-Bediako and R.Sagoe 542-544  
123 Genetic diversity and germplasm maintenance of cocoyam Xanthosoma sagittifolium(L.)Schott A.Agueguia 545-550  
124 Yield of potato as influenced by crop resistance,sanitation and fungicidal treatments against late blight D.A.Fontem 551-554  
125 Advances in potato research in eastern and central Africa N.B.Lutaladio,P.T.Ewell and H.Kidanemariam 555-560  
126 Performance de trois nouvelles variétés de pomme de terre,Solanum tuberosumL.dans le kivu montagneux,a l`est du Zaire T.Mutombo,P.Phemba,N.Feruzi et N.B.Lutaladio 561-565
127 Transfer of potato production and storage technologies:an experience of the central zones of Ethiopia G.Weldegiorgis,E.Zerfu and B.Lemaga 566-568  
128 Resistance of some promising potato clones to potao leafroll virus(PLRV) and its vectors Myzus persicae Sul.and Macrosiphum euphorbiae Thom. H.K.Were,R.D.Narla,J.H.Nderitu and H.M.Kidanemariam 569-574  
129 Evalution of promising potato clones under seed and ware storage conditions at Tigoni,Kenya A.Walingo,J.N.Kabira,H.M.Kidanemariam and P.T.Ewell 575-578  
130 Seedling tuber yield as affected by density of plants grown from true potato seed(TPS) during two contrasting seasons B.T.Tuku,P.C.Struik and H.Kidanemariam 579-583  
131 The effect of seed tuber sizes derived from TPS on yield of ware potatoes(Solanumtuberosum L.) A.Gebremariam,J.A.Chweya and H.M.Kidanemariam 584-586  
132 Adaptability trial of potato advanced clones in the north rift valley province of Kenya C.M.Lusweti,J.W.Nandasaba and H.M.Kidanemarian 587-591  
133 Breeding for quality and quantity 592-594
134 Closing Speech 595