Whiteflies and associated viruses on sweetpotato in Uganda: prevalence, distribution and importance

Pages 580-586

V. Aritua, J. Legg, P. Sseruwagi, N.E.J.M. Smit and R.W. Gibson

ABSTRACT

A diagnostic survey was undertaken to establish the current distribution of whiteflies

and associated viruses on sweetpotato in four major producing areas in Uganda. Whiteflies were

more abundant in south/west and central areas than in north and east. Sweetpotato virus disease

(SPVD) caused hy the co-infection of sweetpotato feathery mottle virus (SFMV) and sweetpotato

chlorotic stunt virus (SPCSV) occurred in 60 of the 80 sweet potato fields sampled. SPVD incidence

was greatest in southern areas around the shores of Lake Victoria and the highest incidence was

recorded in Mpigi district (29%). 154 fresh leaf samples were collected and tested for SPFMV,

SPCSV and sweetpotato mild mottle virus (SPMMV) using ELISA. 100 samples reacted positively

to SPCSV monoclonal antibodies. 72 to SPFMV. SPMMV was detected in 9 samples, and these

were from the central and southern areas only. The two serotypes of SPCSV, Ugandan and Kenyan,

were detected in 6S and 32 samples, respectively. The Ugandan serotype occurred in all districts

except for Tororo and Iganga, although it occurred more frequently in the south and west. The

Kenyan serotype occurred more frequently in the north and east.

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