Resistance of sorghum to Sitophilus oryzae (L) and its association with varietal parameters∗

This paper reports the results of a cooperative program between the Department of Animal Biology/UFV and the National Corn and Sorghum Research Center.

Abstract

Laboratory studies were conducted with 29 sorghum varieties to study the relationship between resistance to Sitophilus oryzae (L.), measured by Dobie's susceptibility index (SI), and grain nutrient content. In a no‐choice test varieties differed significantly with respect to the SI and to grain weight loss, and there were significant positive correlations between these two parameters. Almost 7.5 times more grain weight loss was recorded for the most susceptible variety (AGROMEN 8050) compared with the least susceptible variety (CMSXS 376). Relationships between the SI and nitrogen, carbohydrate content or adult weight were not significant.

Keywords:

• rice weevil
• stored pest
• antibiosis
• sorghum
• Brazil

Notes

This paper reports the results of a cooperative program between the Department of Animal Biology/UFV and the National Corn and Sorghum Research Center.

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