Inheritance of Spotted Wilt Resistance in the Tomato I. Identification of Strains of the Virus by the Resistance or Susceptibility of Tomato Species

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Abstract
Strains of the tomato spotted wilt virus were separated from field-infected material and purified with a range of solanaceous spp. These strains were classified into 4 groups, tip blight (TB), necrotic (N), ringspot (R), and mild (M), according to the symptoms developed by susceptible tomato hosts. Strains within these groups were identified by the resistance or susceptibility of the 5 tomato types Lycopersicon peruvianum, L. pimpinellifolium, and L. esculentum vars. Rey de los Tempranos, Pearl Harbour, and Manzana. This gave a total of 10 distinct strains. It is claimed that this method of classifying the strains will facilitate the identification of genes for resistance to spotted wilt, so that their mode of inheritance can be studied. A possible explanation of the variable resistance of the vars. Rey de los Tempranos, Pearl Harbour, and Manzana is given.