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Characterization of Pathotypes of Cereal Cyst Nematodes, Heterodera Spp., in Sweden

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Pathotype tests were carried out with a total of 97 populations of Heterodera avenae, the Gotland strain of H. avenae, H. hordecalis and H. bifenestra. The populations were grouped by their virulence on five barley differentials (resistance genes): Varde (Rha), Emir (Rha"E"), Ortolan (Rha1), KVL 191 (Rha2) and Morocco C.I. 3902 (Rha3). Ten reaction patterns could be distinguished. With the populations grouped according to morphological/taxonomic considerations, several groups could be further subdivided by reactions on additional differentials. Some of the tested populations did not reproduce on the oat differentials. None of the differentials showed complete resistance to all nematode populations. Virulence frequencies on Rha"E", Rha1, Rha2 and Rha3 were calculated for populations of Heterodera avenae and the Gotland strain. In spite of the complexity due to the occurrence of more than one species and the reactions of additional differentials there was considerable agreement with the results of earlier surveys. Pathotypes Ha11 and Ha 12 were dominant, followed by the main pathotypes G(West) and G(East) of the Gotland strain.

Affiliations: 1: Department of Plant Protection Sciences, Swedish University of Agricultural Sciences, Box 44, S-230 53 Alnarp, Sweden


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