LABORATORY EVALUATION OF DIFFERENT HERBAL OILS AS ANTIFEEDANT AND FOR PYRETHROID RESISTANCE MANAGEMENT AGAINST Spodoptera litura (Fab.)
Loading...
Date
2018-07-17
Journal Title
Journal ISSN
Volume Title
Publisher
Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The present investigation entitled ‘Laboratory evaluation of different herbal oils as antifeedant and for pyrethroid resistance management against Spodoptera litura (Fab.)’ was conducted during 2017-2018 in Insect Toxicology Laboratory of Department of Agricultural Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. The study was undertaken to know the level of insecticide resistance in S. litura to selected pyrethroid insecticides and study the antifeedant activity of different herbal oils in S. litura. It also helped to know the role of herbal oils in mixture with pyrethroid insecticides against S. litura. Three pyrethroid insecticides and three herbal oils viz., Lamda Cyhalothrin 5 EC, Cypermethrin 10 EC, Fenvalerate 20 EC and Karanj oil, Neem oil, Sesame oil were used against third instar larvae of Spodoptera litura (Fab.).
The results on relative toxicity of pyrethroids against S. litura revealed that Lambda cyhalothrin 5 EC was the most toxic compound against 3rd instar (F1) larvae of S. litura followed by Cypermethrin 10 EC and Fenvalerate 20 EC at lethal concentrations. Lambda cyhalothrin 5 EC was found relatively more toxic (i.e. 2.34 times) to the 3rd instar larvae of S. litura than other insecticides tested. Based on relative toxicity of pyrethroid and herbal oil mixtures against S. litura, Lambda cyhalothrin 5 EC + Karanj Oil @ 2% was found the most toxic mixture against 3rd instar (F1) larvae of S. litura than other pyrethroid-herbal oil mixtures tested.
The F1 population of S. litura larvae were found more resistant (2.70 fold) to Fenvalerate 20 EC followed by Cypermethrin 10 EC (2.28 fold) and Lambda cyhalothrin 5 EC (1.46 fold) over laboratory reared susceptible (F7) population of S. litura. Pyrethroid-herbal oil mixtures developed comparatively lower degree of resistance in F1 populations of S. litura when compared to relative resistance recorded for insecticides alone.
The lowest relative resistance at LC50 level (i.e. 0.90 fold) was observed in case of Lamda cyhalothrin 5 EC + Karanj Oil @ 2% mixture while highest (i.e. 2.50 fold) was in case of Fenvalerate 20 EC + Sesame Oil @ 2%. Karanj oil used in mixture with pyrethroids was most effective on supression of resistance in S. litura followed by neem oil and sesame oil. Among the treatments, maximum supression of resistance (i.e. 46.67%) was observed in Fenvalerate 20 EC + Karanj Oil @ 2% and minimum (i.e. 6.58%) in Cypermethrin 10 EC + Sesame Oil @ 2%.
The maximum antifeedant activity (i.e. 61.51%) in 3rd instar larvae of S. litura was exerted by Karanj oil@ 2% followed by Neem oil @ 2% (49.5%) and sesame oil @ 2% (18.38%). The maximum feeding inhibition (i.e. 44.86%) in 3rd instar larvae of S. litura was observed in Karanj oil @ 2% followed by Neem oil @ 2% (32.74%) and sesame oil @ 2% (10.45%).
From the present investigation, we inferenced that karanj oil was most effective in supressing the pyrethroid resistance to some extent and improves the efficacy of pyrethroid insecticides.
Description
In the present study serious efforts are made to know the level of pyrethroids resistance developed in Spodoptera litura (Fab.) and check antiffedant activity of different herbal oils in S. litura. The role of herbal oils in pyrethroid resistance management also determined by researcher. Topical spray method of bioassay using hand sprayer were followed to determine the lethal concentrations of different insecticides alone and in combination with herbal oils against S. litura. Based on LC50 values, relative toxicity and relative resistance of pyrethroids alone and pyrethroids-herbal oil mixtures was calculated to evaluate the suppression of resistance in 3rd instar larvae of S. litura.
Keywords
Plant protection, Pest, Spodoptera litura, Crops, Tobacco, Nicotiana tabacum, Soybeans, Glycine max, Green gram, Vigna radiata, Vigna mungo, Pest Control, Pesticides, Insecticides, Pesticide Resistance, Topical Application, Toxicity, Toxicology, Emulsifiable Concentrates, Antifeedants, Neem Extract. Laboratory evaluation, Herbal oils, Karanj Oil, Neem Oil, Sesame oil, Pyrethroid Insecticides, Lambda Cyhalothrin 5EC, Cypermethrin 10EC, Fenvalerate 20 EC, Pyrethroid Resistance, Pyrethroid Resistance Management, Spodoptera litura (Fab.), Pyrethoid-Herbal Oil Mixture, Relative Toxicity, Relative Resistance, Antifeedant Activity, Feeding Inhibition, Resistance Supression,
Citation
WANKHEDE, MAYUR SHARAD. (2018)Laboratory Evaluation Of Different Herbal Oils As Antifeedant And For Pyrethroid Resistance Management Against Spodoptera litura (Fab.). Department of Agricultural Entomology Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2018. Print. xiii, 69p. (Unpublished).