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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Nov 2015, 36 (6)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Toxicity and bioefficacy of individual and combination of diversified insecticides against jute hairy caterpillar, Spilarctia obliqua

 

K. Selvaraj*, V. Ramesh Babu., B.S. Gotyal and S. Satpathy

ICAR-Central Research Institute for Jute and Allied Fibres (CRIJAF), Kolkata-700 120, India

*Corresponding Author?s E-mail : selvaentomo@gmail.com

 

 

Publication Data

Paper received:

17 April 2014

 

Revised received:

09 December 2014

 

Accepted:

20 March 2015

 

Abstract

Toxicity of conventional (profenofos 50 EC and λ-cyhalothrin 5 EC) and non-conventional (flubendiamide 480 SC, chlorantraniliprole 18.5 SC, emamectin benzoate 5 SG) insecticides was determined on the basis of median lethal concentration (LC50) values on third instar larvae of jute hairy caterpillar, Spilarctia obliqua? under laboratory conditions. Further, the promising binary insecticides combinations with lesser LC50 values and adequate synergistic activity were evaluated under field conditions. The LC50 values calculated for insecticides viz., chlorantraniliprole, flubendiamide emamectin benzoate, λ-cyhalothrin and profenophos were 0.212, 0.232,? 0.511,? 0.985 and? 3.263 ppm, respectively. Likewise, the LC50 values for flubendiamide with λ-cyhalothrin in 3:1 proportion was most toxic (0.103 ppm) amongst all the other binary combinations with λ-cyhalothrin.? Chlorantraniliprole in combination with λ-cyhalothrin at 1:1 proportion (0.209 ppm) was most toxic followed by 3:1 proportion (0.345 ppm). Similarly, emamectin benzoate in combination with λ-cyhalothrin at 1:1 proportion was more toxic (0.271 ppm) than 3:1 ratio (0.333 ppm). Toxicity index of flubendiamide + λ-cyhalothrin (3:1 ratio) was highest (970.87). Bioefficacy of synergistic binary combinations along with individual insecticides established the superiority of profenophos + λ-cyhalothrin (3:1) with 89.12% reduction in infestation and recorded maximum fibre yield 38.67qha-1 under field condition. Moreover, combination of diverse insecticides group might sustain toxicity against the target insect for longer period with least probability of resistance development. ?????  

 

 

 Key words

Bio-efficacy, Insecticides, Median lethal concentration, Spilarctia obliqua,? Toxicity index 

 

 

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