EFFECT OF BIO-RATIONALS AGAINST THE THRIPS, SCIRTOTHRIPS DORSALIS HOOD AND FRUIT BORER, HELICOVERPA ARMIGERA HUBNER INFESTING CHILLI

A. RAVIKUMAR¹*, C. CHINNIAH², S. MANISEGARAN³, S. IRULANDI⁴, P. PARTHIBAN^5
1Department of Agricultural Entomology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai - 625 104, Tamil Nadu, India
²Department of Agricultural Entomology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai - 625 104, Tamil Nadu, India
³Department of Agricultural Entomology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai - 625 104, Tamil Nadu, India
⁴Krishi Vigyan Kendra, Pechiparai - 629 161, Tamil Nadu, India
⁵Department of Agricultural Entomology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai - 625 104, Tamil Nadu, India
* Corresponding Author : aravitnau@gmail.com

Received : 27-02-2016     Accepted : 06-03-2016     Published : 14-04-2016
Volume : 8     Issue : 12       Pages : 1150 - 1153
Int J Agr Sci 8.12 (2016):1150-1153

Keywords : Bio-rationals, Chilli, Helicoverpa armigera, Scirtothrips dorsalis, Yield
Academic Editor : Alexandra D. Solomou
Conflict of Interest : None declared
Acknowledgements/Funding : None declared
Author Contribution : None declared

Field experiment was carried out to test the effectiveness of bio-rationals against thrips, Scirtothrips dorsalis Hood and Helicoverpa armigera Hubner on chilli with nine treatments including an untreated check. Thrips population was the lowest in spinosad 45 SC @ 0.4ml l-1 (0.60 / leaf) which was on par with emamectin benzoate 5 SG @ 0.4g l-1 (0.65 / leaf) and found to be superior to the standard check (dimethoate 30 EC @ 2ml l-1). Similarly, spinosad 45 SC @ 0.4ml l-1 and emamectin benzoate 5 SG @ 0.4g l-1 recorded the lowest larval population of H. armigera of 0.51 and 0.55 / plant. The next effective treatments were Beauveria bassiana @ 1 x 108 spores ml-1 and neem oil 3 % which recorded thrips population of 1.06 and 1.18 / leaf. With regard to fruit borer, Bacillus thuringiensis var. kurstaki @ 1 kg/ha (0.85 larvae / plant) ranked next to spinosad 45 SC and emamectin benzoate 5 SG. Similar trend was noticed with regard to leaf curl damage by thrips and per cent fruit damage by H. armigera. The highest yield of dry chilli fruits 1480 kg ha-1 was registered in spinosad 45 SC @ 0.4ml l-1, which was on par with emamectin benzoate 5 SG @ 0.4g l-1 (1420 kg ha-1) with respective additional income of Rs. 28,200 and Rs. 24,600. The highest cost benefit ratio (1:4.09) could be obtained in spinosad 45 SC @ 0.4ml l-1 followed by 1:3.97 in case of emamectin 5 SG @ 0.4g l-1.