Studies on relative composition of egg parasitoids of rice yellow stem borer, Scirpophaga incertulas (walker) in kharif 2017

Abstract

The experiment was conducted at Research cum Instructional Farm of IGKV, Raipur (C.G.) during Kharif, 2017-18. Biological control may be defined as the use of natural enemies to suppress the pest species.The hymenopteran parasitoids, Telenomus sp., (Scelionidae), Tetrastichus sp. (Eulophidae) and Trichogramma sp. (Trichogrammatidae) were the three important YSB egg parasitoids recorded from this area which played an important role in population regulation of YSB. In stem borer egg parasitization maximum per cent of egg parasitization by Telenomus sp. was observed in the 41 SMW second week of October (50.07%). Parasitization by Trichogramma sp. was maximum with (17.31%) during 39 SMW of September and parasitization by Tetrastichus sp. was shown maximum during 44 SMW with (15.55%).