author(s)
J Manjunath, K Manjula, RP Vasanthi, KSS Naik, KV Hariprasad, T Muralikrishna, TNVKV Prasad and B Ravindra Reddy

abstract
The present studies on damage and infestation by Caryedon serratus over 52 genotypes/varieties and were classified or categorized (grouping) into least susceptible, moderately susceptible and highly susceptible based on physical parameters at Regional Agricultural Research station, Nandyal during 2015-16. The physical parameters of groundnut pods were shown to influence infestation by C.serratus. Pod reticulation seems to have played a negative role in oviposition preference by the bruchid. Other physical parameters like shell thickness also influences the infestation. The Vemana variety recorded less thickness (0.73mm) and recorded more per cent weight loss (28.24% )whereas shell thickness was comparatively more in the varieties K 2075 (2.01mm) and K7 (1.74mm) which recorded less per cent weight loss from 1.97 and 3.60. Least susceptible varieties i.e. K2075, K1677 and Dharani possess 2.22 to 2.82 kg m^-2 shell hardness. Least susceptible and moderately susceptible lines consists of good shell thickness, hardness, low inter granular space and prominent reticulation.