author(s)
K Sunil Kumar, T Murali Krishna, K Sreedevi, G Karuna Sagar, K Manjula, R Sarada Jayalakshmi Devi and B Ravindra Reddy

abstract
Holotrichia reynaudi was the predominant species of root grub collected from the groundnut growing areas of the Rayalaseema region of Andhra Pradesh. Studies on the biology of root grub, H. reynaudi in groundnut was carried out under laboratory conditions from June to December in 2014 and 2015 in the Department of Entomology, Agricultural Research Station, Utukur, Kadapa. The studies revealed that each female laid 18.68 ± 3.77 eggs with 76.95 ± 10.55 per cent hatchability. Incubation period was 11.16 ± 0.43 days. The duration of I, II and III instars were 15.40 ± 0.52, 17.36 ± 0.36 and 33.84 ± 0.55 days, respectively. Total grub period was 66.62 ± 0.48 days. Pupation occurred in earthen cell and pupal period was observed as 17.06 ± 0.46 days. Male and female adult duration were observed as 18.61 ± 1.28 and 21.38 ± 1.05 days, respectively. The total life cycle from egg to adult lasts for 114.81 ± 1.16 days under laboratory conditions. The average mating period was recorded as 48 minutes and the average sex ratio of male to female was 1:1.30.