Indian Journal of Ecology
Year : 2020, Volume : 47, Issue : 4
First page : ( 1107) Last page : ( 1110)
Print ISSN : 0304-5250.

Studies on safety evaluation of carbosulfan on the predator, chrysoperla zastrowi sillemi Esben-Peterson

Kamala I. Merlin*

Pesticide Toxicology Laboratory Department of Agricultural Entomology Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Tamil Nadu-641 003, India

*merlinento@gmail.com

Online published on 9 March, 2021.

Abstract

The toxicity of carbosulfan to the chrysopids, Chrysoperla zastrowi sillemi Esben-Peterson is assessed in laboratory as well as field conditions. Lesser ovicidal action was observed at the effective field dose at Carbosulfan @ 250 g a.i. ha^-1 recording 80.5 and 89.5 per cent mortality after 24 and 48 Hours of treatment. All the tested concentrations caused significant grub mortality when subjected to oral feeding and dry film methods. The recommended dose showed 58.0, 78.0 and 90.0 per cent in oral feeding method and 64.0, 86.0 and 98.0 per cent mortality in dry film method at 12, 24 and 48 HAT. Carbosulfan was not safe to adult green lace wings when assessed through contamination method with an adult longevity of 6.60 days and fecundity rate per five females being 90.60. eggs. In the field, the adults recorded a reduction in population from 6.0 before treatment to 4.0 on the first day after treatment, but rebounded to almost the original population @ 5.0 on third day after treatment at the recommended dose at carbosulfan @250 g a.i. ha^-1. The study suggested the toxicity of carbosulfan 25 EC to chrysopids, but the recommended dose can be used in case of severe infestation of pest owing to its capability to manage brinjal pests efficiently.

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Keywords

Carbosulfan, Brinjal, Toxicity, Green lace wing, Chrysoperla zastrowi sillemi.

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