Studies on the emergence pattern of different white grub species at bawal, haryana, India

The pattern of white grub beetles’ emergence in relation to different abiotic factors on groundnut was studied at Regional Research Station, Bawal (Rewari) of CCS Haryana Agricultural University, Hisar using light trap catches from May to November, 2005. White grub beetles started in May and continued till November. A total of 13 species were trapped and Holotrichia consanguinea Blanchard was the most abundant (1214 adults), followed by H. serrata Fabricus (382 adults), Anomala varicolor (85), A. dorsalis (44) and A. bengalensis (45) and the rest of species were insignificant in numbers (totalling 228). The beetles started emerging during 18th standard week, predominated solely by genus Holotrichia (49 beetles), H. consanguinea being most abundant (44) and this trend continued upto 26th week when highest numbers of H. consanguinea beetles (292 beetles) were trapped. Afterwards, its numbers started declining appreciably and that of other species increased. During June, 336 beetles were trapped and their numbers peaked in July (807) declining from August onwards. During the active white grub season, a total 1998 beetles were trapped, H. consanguinea were the most predominant species (1214) followed by H. serrata (382), A. dorsalis (85), A. bengalensis (44) and A. varicolor (45) and 228 beetles belonging to other species. Sub-family Melolonthinae was most abundant (80.1%) followed by sub-family Rutelinae (8.3%).