Management of Helicoverpa armigera (Hubner) in Chickpea through Insecticides and Bio-pesticides
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Date
2016
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MPUAT, Udaipur
Abstract
An investigation on “Management of Helicoverpa armigera (Hubner) in chickpea through insecticides and bio-pesticides” was carried out at the Instructional Farm, Rajasthan College of Agriculture, Udaipur for two consecutive years i.e, rabi, 2013-14 and 2014-15.The gram pod borer, H. armigera was observed at all growth stages of the crop. The incidence of pod borer began in the first week of December with the population reaching the peak in the second (6thSMW) week of February, 2013-14 and third (7th SMW) week of February, 2014-15. The larval population of the borer exhibited a significant positive correlation with the mean atmospheric temperature during rabi, 2013-14 and 2014-15, the r value being 0.60 and 0.65, respectively. The loss estimation due to insect pests on chickpea showed that mean plant height under treated condition was 1.10 and 1.11 times more than when unprotected; likewise, the mean number of pods was 1.25 and1.32 times more when the crop was protected. Mean number of damaged pods was 5.44 and 5.12 times more and the mean percent pod damage was 6.76 and 6.86 times more under unprotected condition. Similarly,the mean seed per pod was 1.68 and 1.70 times more in protected plot than when left unprotected. Mean yield /plant (g) and mean yield/plot (g) were 2.09 and 2.19 and 1.43 and 1.45 times more when the crop was kept protected. On the basis of yield, an avoidable loss of 29.93 and 31.28 per cent was recorded due to H. armigera infestation in chickpea variety GNG 1581. Among the recommended chickpea varieties Vijay recorded lowest percent pod damage followed by RSG 888, while varieties Samrat and Kabuli recorded maximum percent pod damage. On the basis of pest susceptibility rating (PSR) varieties Vijay and RSG 888 were least susceptible and varieties GNG 1581, Dahod yellow, Samrat, BGM 547, RSG 963, RSG 564 and Kabuli were moderately susceptible. Maximum yield was recorded for Vijay followed by RSG 888 while minimum yield was recorded for Samrat and Kabuli varieties during both the years. Evaluation of efficacy of insecticides and biopesticides against gram pod borer, H. armigera showed that the treatment T1 (Flubendiamide 480 SC @ 200 ml/ha) was most effective, which caused highest mean percent reduction in population of gram pod borer larvae. The biopesticide treatment of T6 (HaNPV 200 LE @ 250 ml/ha) and T7 (Bt.k 8 L @ 1lit/ha) were least effective against gram pod borer.The highest seed yield of 22.78 and 24.53 q ha-1 was obtained from T1 (Flubendiamide 480 SC @200 ml/ha) and minimum yield 16.00 and 15.20 q ha-1 was recorded in T9 (HaNPV- Bt.K- Bt.K @ 250LE-1Lit-1Lit/ha), during rabi 2013-14 and 2014-15. The highest benefit: cost ratio of 1.26 and 1.42 was recorded in T1 (Flubendiamide 480 SC @200 ml/ha) and minimum benefit cost ratio 1.03 and 1.04 was recorded in T9 (HaNPV- Bt.K- Bt.K @ 250LE-1Lit-1Lit/ha, during rabi 2013-14 and 2014-15.
Description
Management of Helicoverpa armigera (Hubner) in Chickpea through Insecticides and Bio-pesticides
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Citation
Kachhawa and Rana, 2016