Classification of Cassava Into Bitter

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Classification of Cassava Into Bitter Cool
in Malawi From Farmers Perception to DNA
CharacterizationJonathan Mkumbira

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Interviews
Agronomy
Culture
Crop/Cultivar
Farmer
Food habits
Consumer
Economy
Environment
Molecular
Chemistry
markers
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(Chiwona-Karltun et al. 1998 2000)
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Aims

• Cultivar single or mixture of genotypes?
• How accurate are farmers in identifying cultivars
  genotypes?
• Are bitter cool cultivars 2 different gene
  pools?

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• Nkhata Bay

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Genotypes found among 232 plants
Cultivars
Total
'Typical'
Prop. ()
HCN eq.
'Cool'
Mbundumali
24
22
92
26
18
Chimphuno
13
72
25
Nyachikundi
20
15
75
32
'Bitter'
Gomani
22
22
100
163
Depwete
26
19
73
111
24
Kolobeki
14
58
123
Nyahalawa
24
13
54
112
Nyankhata
26
15
58
203
Ng'wenyani
24
13
54
177
Nyamakozo
24
21
88
251
Cultivar name one genotype
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Acknowledgement

• Farmers
• Research Extension, Malawi
• University of Malawi, IITA
• Funding from SIDA/SAREC, ISP