Date of this Version
JOURNAL OF THE KANSAS ENTOMOLOGICAL SOCIETY 58(2), 1985, pp. 369-371
We evaluated five annual Medicago species (M. disciformis DC., M. rigidula (L.) All., M. ciliaris (L.) Kroeker, M. rugosa Des., and M. rotata Boiss.) as potential hosts of the alfalfa seed chalcid, Bruchophagus roddi (Gussakovsky), in growth chambers. A perennial, M. sativa L., was used as a susceptible control. The five annual species represented the four sections (Leptospirae, Pachyspirae, Intertextae, Rotatae) of the subgenus Spirocarpus.
In no-choice tests, all annual species were highly resistant to the chalcid. Ovipositor marks and larvae were found in some M. rigidula. The other annuals were uninfested. In a second test, we were unsuccessful in rearing adults from infested M. rigidula.