Abstract
A survey was carried out in the 1996/97 and 1997/98 growing seasons on a field planted in three replicates with five clones of cassava at the International Institute of Tropical Agriculture, Ibadan, located in a transition forest, to determine the effects of cassava genotype and climate on the development of African cassava mosaic geminivirus (ACMV) and changes in the Bemisiatabaci population. Cassava genotype, climate and their interactions have significant (P<0.01) effects on the population of B. tabaci and the development of ACMV. The incidence of ACMV was significantly (P<0.01) higher in clones 81/01635 and 92/0520 than in TMS 30572 and 94/0239, while 91/02327 showed the greatest resistance. A positive correlation between the incidence and severity of ACMV was observed, but this did not correlate with the whitefly population density.
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