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Agricultural Journal
Year: 2007  |  Volume: 2  |  Issue: 2  |  Page No.: 337 - 342

Relationships Between Stem Borer Resistance Traits and Grain Yield Reduction in Maize: Correlations, Path Analysis and Correlated Response to Selection

A.C. Odiyi    

Abstract: Information on the relationship between grain yield loss and stem borer damage is important in developing an efficient improvement programme for resistance to the borers. The relative contribution of damage parameters of Sesamia calamistis (Hampson) and Eldana saccharina (Walker) to grain yield loss in maize and interrelationships among them were studied in trials in the early and late seasons of 2002. Moderate to high correlations were observed among most pairs of resistance traits. Grain yield loss had moderate correlations with leaf feeding damage, number of broken stalks and stem tunnelling. Genetic correlations between resistance parameters and other agronomic traits were predominantly negative. In the path analysis, stem tunnelling and leaf feeding damage exerted the highest positive and direct effects on grain yield loss. Other resistance traits showed negative direct effects. Indirect effects of dead heart count and number of broken stalks were high through stem tunnelling whereas cob damage count showed high indirect effect through leaf feeding damage. Correlated responses to selection show that selection for improved grain yield would positively influence reduction in stem tunnelling.

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