Abstract
Ten improved varieties of cassava Manihot esculenta (Crantz) obtained from the International Institute of Tropical Agriculture (IITA) Ibadan and a local variety (Efuwa) which served as a local check were evaluated for resistance to Cassava Bacterial Blight (CCB) at the Rivers State Agricultural Development Programme (ADP) Research Farm Degema, Rivers State, Nigeria. The varieties were laid out in a randomized complete block design and replicated three times. Field observation showed that seven varieties were resistant to CBB infection with proportional increase in tuber yield except 91/02324, 97/3200 and 98/2101. Two categories of varieties were observed in the study. The first category consists 97/0162, 96/1642, 96/1632, 99/6012 and 94/0026 which had high resistance to CBB and good tuber yield (26.8�� ℎ�� −1 − 35.32�� ℎ�� −1 ) thus having potential in reducing foliar diseases as well as increasing tuber yield. The second category: TMS 30572, 96/1642, 99/6012 and 94/0026 produced relatively high biomass (10.68�� ℎ�� −1 − 23.32�� ℎ�� −1 ) and good tuber Yield (27.71�� ℎ�� −1 − 35.04�� ℎ�� −1 ). This group cantherefore be cultivatedfor good foliage and tuber yield. The
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