Abstract
ABSTRACT. 1. Host plant relations of closely related species and pseudogamous triploid forms of the planthopper genus Ribautodelphax were studied. 2. From field data and experimental results it is concluded that eleven European Ribautodelphax species and undescribed taxa are monophagous or oligophagous on different grass species. Only two Ribautodelphax species are found on the same grass species in the field. 3. Differential host plant relations indicate that four recently discovered taxa are probably true species. 4. Ribautodelphax species show a more restricted host plant range in choice experiments compared with breeding tests. 5. Choice experiments indicate no differences in host plant preference between males and females of two Ribautodelphax species. 6. No differences are found in host plant relations between bisexual species and associated pseudogamous triploid forms.
Published Version
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