Both Pepino mosaic virus (PepMV) and Potato virus X (PVX) are in the Potexvirus genus in the Flex-iviridae family. PepMV was first reported in greenhouse tomatoes in Europe in 1999 (van der Vlugt et al. 2000) and has since been found in tomatoes of North and South America (French etal. 2001;

Soler etal. 2002). Pico etal. (2002) reported that S. chilense and S. habrochaites both indicated resistance to PepMV. At this time, there is no published report as to the incorporation of this resistance into cultivated tomato. However, it is anticipated that in the near future there will be tomato lines resistant to this disease. More than one tomato breeding program is working on introgression into tomato of PepMV resistance from relatives of tomato (MR Stevens, pers. comm.).

Very little has been published on tomato resistance to PVX. A probable reason behind the lack of studies is that PVX has limited impact on tomato except in areas where the crop is grown near potato production. This situation has been especially noted in Pakistan and regions surrounding that country where the single published study was conducted (Rashid et al. 1989). Three tomato cultivars with moderate resistance were reported (Rashid et al. 1989).

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