Progress in studies of phoma blight of common bean in Eastern Africa.
1990
Sengooba T. | Male Kayiwa B.S.
Progress is reported in the breeding and pathology of Phoma blight (PB) (Phoma exigua var. diversispora) of bean, initiated in 1987. Extensive screening has been conducted at Kachwekano in south-western Uganda. Disease pressure varied across seasons. Resistance was very rare among bush bean genotypes but was fairly stable in G 4603, AND 556 and G 17098. More resistants were found among climbers, the best being G 12582, G 10747 and VRA 81051. A number of P. coccineus lines exhibited very good resistance. Crosses were started in 1989 to improve local genotypes and for inheritance studies. A regional nursery has been established. PB tended to be more severe in beans in association with maize than in pure stand, especially when maize was between rows of beans, but the differences were not always significant. Genotype X cropping system interactions were not significant. Fungicidal application significantly reduced PB infection. Roguing also tended to do so but the differences were not significant. Cleaning infected bean seeds by sowing in a disease free area proved promising.
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