Screening of groundnut genotypes against caryedon serratus (Olivier)

Evaluation of 36 genotypes (released and pre-released) for resistance to Caryedon serratus (Olivier) has been done in this study. The biological (oviposition, survival, mean development period and weight loss) and physical parameters (pod length, width, shell thickness and weight) were observed. The genotypes were grouped into resistant (ALR 1 and ALR 2), moderately resistant (32 Nos.) and moderately susceptible (2 Nos.) based on the Susceptibility Index (SI). The physical and biological parameters have been correlated with SI. Oviposition was less in TMV 7 and more in VG 17016 genotypes. ALR 1 and TMV 14 registered the least and maximum % survival, respectively. Mean development period was the least in VRI 4 and maximum in ALR 1. Maximum weight loss was found in VRI 5 and minimum in ALR 1. Egg count exhibited positive relationship with all physical parameters but no relationship with SI Survival had significant negative correlation with pod length and shell thickness; whereas it showed positive correlation with SI. Mean developmental period witnessed no relationship with physical parameters and negative relationship with SI, while weight loss showed strong correlation with pod width and SI.