Sorghum Resistance to Rice Weevil, Sitophilus oryzae: Antibiosis and Antixenosis
2013
Subbarayudu, B | Kalaisekar, A | Prasad, G Shyam | Bhagwat, V. R. | Babu, K Srinivas | Patil, J. V.
Twenty sorghum cultivars along with a maintainer line, 296B were screened for susceptibility to Sitophilus oryzae at the Directorate of Sorghum Research (DSR), Rajendranagar, Hyderabad, India. The grain traits such as hardness, fat and protein content imparting resistance to rice weevil were studied and correlated with weevil damage. Considering the adult weevil population, colonization, oviposition and seed damage, the genotypes viz., CSV 15, SPV 1330, SPV 462, SPV 1231, CSV 13, 296 B and Local Yellow were found the least susceptible to S. oryzae. The higher quantities of protein imparting resistance to rice weevil oviposition and its adult colonies with SPV 1330, SPV 462, SPV 1231, SPV 1328, CSV 13, CSV 11, CSH 5, CSH 16, SPH 821 indicating antibiosis for dominant component of resistance among the sorghum genotypes. The higher doses of fat significantly reduced the oviposition and rice weevil adults in SPV 1231, SPV 462, CSV 13, CSV 15 and CSH 9. The studies demonstrate that antixenosis and antibiosis to S. oryzae in the development of varieties, hybrids and in locals to ensure greater non-chemical protection over long term sorghum storage.
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