Antixenosis resistance in okra and their hybrid derivatives against shoot and fruit borer Earias vittella (Fab.)

Abstract

The present study was undertaken to analyse the antixenosis mechanisms of resistance in okra accessions and their hybrid derivatives against Shoot and Fruit borer E. vittella. With regard to the free choice feeding preference, the accessions Salem Local, Hy1 and Hy2 were not preferred by any larvae even up to 8 hrs. In confined condition, the accession Hy2 recorded lowest length of fruit damage by the larvae in 8 hrs. The accession Arka Anamika fruit was bored up to a length 7.8 cm by the larvae in 8 hrs. On studying the preference of E. vittella moths for oviposition, the accession Hy2 and Hy4 were least preferred by E. vittella adult moths. In the fruit of the okra accessions, the accession Hy2 had the maximum number, high length and breadth of trichomes. It was observed that the fruit length of Arka Anamika was greater than other accessions. Regarding fruit width of Salem Local was greater than other accessions. Fruit angle to stem of accession Hy4 was higher than other accessions.