Relative Influence of Insecticides on Colony Forming Units (CFUs) of Bacteria and Fungi in Rice (Oryza sativa L.) Soil

Author: Tarra Hemanth, Ratna Kumari B.*, Madhumathi T. and Prasanna Kumari V.

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Abstract

A laboratory study was conducted at Department of Entomology, Agricultural College, Bapatla to investigate the influence of five insecticides viz., imidacloprid 17.8 SL, chlorantraniliprole 18.5 SC, dinotefuran 20 SG, pymetrozine 50 WG, cartap hydrochloride 4 G at recommended dose (RD) and double the recommended dose (DRD) on the colony forming units (CFUs) of bacteria and fungi in black clay and sandy clay loam soils collected from fallow rice fields of Guntur district. The results indicated that the application of imidacloprid 17.8 SL at both RD and DRD resulted in significant decline in bacterial and fungal population in both the soils with a mean value of 146.50 × 10-6 bacterial CFUs/g soil and 19.83 × 10-4 fungal CFUs/g soil at DRD. Chlorantraniliprole 18.5 SC at both RD and DRD had no significant inhibitory effect on bacterial population in both the soils. In fact, the fungal population declined slightly in both the soils (28.33 × 10-4 CFUs/g in sandy clay loam and 36.33 × 10

Keywords

Rice (Oryza sativa L.), Soil, Insecticides, Bacteria, Fungi, Colony forming units.

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