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Methodology for determining susceptibility of rough rice to Rhyzopertha dominica and Sitotroga cerealella
- Franklin H Arthur, Laura Starkus, Michael C Smith, Thomas W Phillips
- Journal of pest science 2013 v.86 no.3 pp. 499-505
- Oryza sativa, Rhyzopertha dominica, Sitotroga cerealella, Southern blotting, adults, crop damage, insect reproduction, larvae, moths, neonates, pest resistance, progeny, rough rice, United States
- Varieties of rough rice, Oryzae sativa (L)., were obtained from different sources in the south-central United States and evaluated for susceptibility to the lesser grain borer, Rhyzopertha dominica (Fab.), and the Angoumois grain moth, Sitotroga cereaella (Oliver), in laboratory studies. Adult R. dominica were fed on the rice varieties for 2 weeks, removed, and assessed for progeny production after an additional 6 weeks. S. cerealla susceptibility was evaluated by exposing two mating pairs of moths on a particular variety until the adults died. R. dominica parental survival, progeny production, and feeding damage by parental and progeny adults were variable, with survival ranging from 19.4% to 95%. R. dominica parental feeding damage, progeny production, and progeny feeding damage were all correlated (r = 0.35 to 0.97, P < 0.001). Parental feeding of R. dominica provided access for neonate larvae to infest the rice hull. All rice varieties supported development of S. cerealla, and the variety Vista, which did not support growth of R. dominica, was one of the most susceptible varieties to S. cerealella. Progeny production of both species was generally correlated, but we observed only two instances of specific correlation for any rice variety.