Indian Journal of Agricultural Research

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Research Article

Indian Journal of Agricultural Research, volume 54 issue 2 (april 2020) : 181-186

Investigations on the Larvicidal Effect of Red Algal Seaweeds of Rameswaram Coast Against Tobacco Caterpillar Spodoptera Litura (Fab.)

N. Dharanipriya, R. Kannan
1<div style="text-align: justify;">Department of Entomology, Faculty of Agriculture, Annamalai University, Annamalainagar-608 002, Tamilnadu, India.</div>
Cite article:- Dharanipriya N., Kannan R. (2019). Investigations on the Larvicidal Effect of Red Algal Seaweeds of Rameswaram Coast Against Tobacco Caterpillar Spodoptera Litura (Fab.). Indian Journal of Agricultural Research. 54(2): 181-186. doi: 10.18805/IJARe.A-5310.

ABSTRACT

Investigations on the insecticidal activity of Red algal seaweeds viz., Gracilaria corticata J. Agardh, Liagora ceranoides J. V. Lamouroux, and Asparagopsis taxiformis (Delile) collected from Rameswaram coastal ecosystem against Leaf eating caterpillar, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae)  was conducted in the Department of Entomology, Faculty of Agriculture, Annamalai University, India during 2016-2018. Powdered seaweeds at 1, 3, 5, 7, 10 and 20 per cent concentrations were investigated for their toxicity and insect growth regulator activity aganist S.litura under CRD in free choice test with three replications along with control. Observations showed that, larval mortality noticed after 36 hours after treatment in G. corticata treatments and even 100 per cent mortality was achieved at 72 hours of treatment, whereas the other two seaweeds exhibited larval mortality only after 72 hours of treatment and extended further to pupation and adult emergence. Among the concentrations the higher doses (20 and 10%) exhibited the maximum larval mortality (100%) while the maximum doses of other two seaweeds powder treatments did not, exhibited cent per cent larval mortality at any point of time and even pupated and gone for adult emergence also. The results displayed that, all the seaweed had exhibited larval mortality and their inhibiting substance inside needs to be investigated.

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