Research Article | Volume: 4, Issue: 1, Jan-Feb, 2016

Evaluation of liquid formulations of Bt against gram pod borer, Helicoverpa armigera (Hubner) and spotted pod borer, Maruca vitrata (Geyer) in pigeonpea

G. V. Suneel Kumara,  L. Vijaya Bhaskarb,  Y. Satishc ,  S. J. Rehamand   
G. V. Suneel Kumara, L. Vijaya Bhaskarb, Y. Satishc , S. J. Rehamand

aAgricultural Research Station, Darsi, Prakasam Dt. – 523 247, A. P., India.

bAgricultural College, Mahanandi, Kurnool Dt. – 522 034, A. P., India.

cRegional Agricultural Research Station, Lam, Guntur Dt. – 522 034, A. P., India.

dAICRP Biocontrol, ARI Campus, PJTSAU, Rajendranagar, Hyderabad. -500 030, India.

Open Access   

Published:  Feb 19, 2016

DOI: 10.7324/JABB.2016.40107
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Abstract

A field experiment was conducted during 2012-13, 2013-14 and 2014-15 at Agricultural Research Station, Darsi, Prakasam district, Andhra Pradesh to evaluate Bt liquid formulations and other biopesticides against gram pod borer, Helicoverpa armigera and spotted pod borer, Maruca vitrata in pigeonpea. There were 10 treatments (2 strains of Bt liquid formulation each at two doses, powdered Bt formulation, two doses of Beauvera bassiana, neem formulation, chemical check) including untreated control. Pooled analysis of three years data revealed that two sprays of chlorpyriphos 0.25% at fortnightly interval was significantly superior over other treatments in suppressing the larval population of H. armigera (av. 0.81 larvae/plant) and M. vitrata (av. 0.80 larvae/ inflorescence) on pigeon pea and recorded minimum pod (5.07%) and seed (3.24 %) damage with maximum 16.9 q/ha yield. It was however, at par with the Bt strain NBAII-BtG4 @ 2% in respect of pod damage (5.30%), seed damage (3.91%) and yield (15.3 q/ha). The Bt strain NBAII-BtG4 @ 2% ranked next best to the insecticidal spray in recording surviving larval population of H. armigera (av. 1.01 larvae / plant) and M. vitrata (av. 1.10 larvae / inflorescence). Moreover, the treatment PDBC-BT1 @ 2% was also found to be equally effective to superior ones. It is therefore biopesticides should be encouraged as eco-friendly insecticides.


Keyword:     Bt liquid formulations Biopesticides Eco-friendly management Helicoverpa armigera Maruca vitrata Pigeonpea.

Citation:

Suneel Kumar GV, Bhaskar LV, Satish Y and Rehaman SJ. Evaluation of liquid formulations of Bt against gram pod borer, Helicoverpa armigera (Hubner) and spotted pod borer, Maruca vitrata (Geyer) in pigeonpea. J App Biol Biotech. 2016; 4 (01): 039-042. DOI: 10.7324/JABB.2016.40107

Copyright: Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license.
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Reference

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