Field life table of white grub/Scarabaeidaes on groundnut (Arachis hypogaea L.)

Abstract

The field life table of white grub/scarabaeidaes on groundnut was constructed to understand the factors responsible for mortality of different developmental stages of white grub/scarabaeidae in groundnut at Anandpar village of Vanthali Taluka in Junagadh district during kharif, 2018. The sampling was done from previously selected white grub infested groundnut field from the fifteen quadrates and 15 cm deep from the soil in each selected field thrice, at 30 days interval. The results revealed that mortality in younger group, older group and pupal stage were mainly due to fungal infection i.e. Beauveria bassiana Bals (3.76, 4.99 and 3.82%), Metarhizium anisopliae Metschn (2.54, 5.11 and 3.09%) and parasitic mite i.e. Rhizoglyphus sp. (8.23, 9.04 and 4.85%), respectively. Among the different life stages of the white grub/scarabaeidaes, the maximum population declined in older grub group as the “k” value for this group was to the tune of 0.1386. It was seen that, in all the groups parasitoids caused more mortality than fungal diseases.