VALIDITY OF PREDICION METHODS UNDER POPULATION STRESS IN COMPOSITE AND VARIETAL HYBRIDS IN MAIZE (ZEA MAYS L.)

Abstract

Prelerential oviposition and antibiosis are the two factors considered vital components ofhost plant resistance [1]. Beck [2] suggested that recognition and orientation ofthe host plant followed by selection of specific site, the deposition of eggs and insect feeding in a crop are governed by the inherent physical and chemical factors. Dosger and Hanson [3] reported significant differences among lucerne varieties against the weevil, Hypera postica, and these were attributed to differential tolerance behaviour of the varieties.