Effects of Infestation and Transmission of the Common Bean Mosaic Virus (CBMV) By The Black Bean Aphid A. Fabae on the Common Bean P. Vulgaris

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Khaemba, B.M
Latigo, M.W.O
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Damage effects caused to vegetative growth and yield components of Phaseolus vulgaris L. by Aphis fabae Scopoli combined with the transmission of the Common Bean Mosaic Virus (CBMV) were generally significant (P≤O.05) when aphid infestation occured during the early (EVS) and late vegetative stages (LVS) of bean development, and to a lesser extent, during anthesis (ANS). Damage was aggravated when higher (6 aphids/plant) rather than lower (3 aphids / plant) initial infestations of A. fabae were applied and when such aphids used transmissitted CBMV to beans. Regression analyses 'Of bean response to A. fabae infestations showed that significantly (P~O.01) larger proportions of components of response were linear rather than quadratic or cubic. This indicates that the most vulnerable bean developmental stages during which aphid infestation and CBMV infection are most harmful to growth and productivity of P. vulgaris are EVS, L VS and ANS. It was shown by these studies that the magnitude of damage caused to beans was governed by initial aphid intensity, bean infestation by CBMV and, to a greater extent, by the stage of bean development at which the crop was attacked.
East African Agricultural And Forestry Journal, XLVI (1-4), pp. 2-4