Resumen de Transmission efficiency of Tunisian "Potato leafroll virus" isolates by Tunisian clones of the "Myzus persicae" complex (Hemiptera: Aphididae)
J. Rouzé Jouan, J. Djilani Khouadja, M. Bouhache, J.P. Gauthier, M. Marrakchi
Potato leafroll virus (PLRV) is naturally transmitted by aphids, especially by the Myzus persicae complex (Hemiptera: Aphididae), in a persistent manner. The transmission efficiency of Tunisian PLRV isolates by Tunisian clones of M. persicae is unknown. Thus, six Tunisian and two French control clones (MP3 and LCSA) of M. persicae complex were used to assess the aphid transmission of nine PLRV isolates collected from three different Tunisian field regions. The transmission values were compared to the transmission efficiency of two PLRV isolates characterized as highly (CU87) and poorly (14.2) aphidtransmissible. Experiments conducted under controlled conditions showed that the transmission rates obtained were in general high. All tested PLRV isolates were good transmitted (40-100%) except for the PLRV14.2 isolate characterized as poorly transmissible which was not transmitted by all Tunisian M. persicae clones. The relation between the transmission rate and the mean value of antigen titre was also reported.
