A screening technique for resistance to Fusarium root for of common bean
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Resistance to Fusarium root rot (FRR) in common bean is documented as a quantitative trait and as
such is greatly influenced by several environmental factors. A reproducible disease screening
technique that considers the selection environment is therefore important in selecting resistant lines. A
study was conducted to evaluate soil composition and irrigation frequency on the severity of FRR,
using a predominant pathogenic isolate from SW Uganda at the International Centre for Tropical
Agriculture (CIAT) in Uganda. Five soil compositions (i) 80% lake sand:20% forest soil, ii) 50% lake
sand:50% forest soil, iii) 80% swamp soil:20% forest soil, iv) 50% swamp soil:50% forest soil and v)
forest soil alone), and five irrigation frequency levels (once a week, twice a week, three times a week,
four times a week, and daily) were evaluated on six common bean varieties with varying levels of
resistance to FRR. Forest soil and 50% swamp soil: 50% forest soil (soil composition); daily irrigation
and irrigation once a week (irrigation frequency) differentiated test varieties most distinctly, according
to their reaction to FRR. In conclusion, a combination of forest soil and daily watering using a
pathogenic isolate FSP-3 provided adequate FRR disease levels for disease evaluation and
differentiation of bean varieties and was adopted for genetic studies on FRR resistance in beans.
Palabras clave
common bean, fusarium root rot, resistance, irrigation frequency, screening technique, soil composition