| Summary: | The ability of populations of adult apterous Aphis craccivora. A, gossypii and A, citricola to
transmit the cowpea aphid-borne virus (CAMV) and cucumber mosaic virus (CMV) to cowpea was
investigated. CMV was more readily transmitted than CAMV by all three aphid species, but was most
readily transmitted hy A. craccivora andyl. citricola, with transmissions ranging from 64—71 %. With
CAMV, the infection level with A. gossypii was higher than with A. craccivora and both were more
efficient than A. citricola, although the differences were not significant. With mixed infections of
CAMV and CMV, there was a higher level of CAMV transmission using yl. craccivora from sequential
feeding when CMV-infected plants were fed on first followed by CAMV-infected plants, suggesting
that cowpea plants were more prone to infection by CAMV when already infected by CMV.
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