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Apparent Resistance to Establishment of Infection by Curly Top Virus in Tomato Breeding Lines. Peter E. Thomas, Plant Pathologist, Crops Research Division, ARS, USDA, Irrigated Agriculture Research and Extension Center, Prosser, Washington 99350; Mark W. Martin, Geneticist, Crops Research Division, ARS, USDA, Irrigated Agriculture Research and Extension Center, Prosser, Washington 99350. Phytopathology 61:550-551. Accepted for publication 14 December 1970. DOI: 10.1094/Phyto-61-550.

The nature of resistance of six tomato cultivars to curly top virus was studied. Our observations suggest that: (i) Their resistance results primarily from characteristics which reduce the chances of being infected; (ii) resistance is effective in both the seedling and adult stages; and (iii) by and large, resistance is effective under both field and greenhouse conditions.