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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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Index Copernicus ICV 2017: 100.00
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Int.J.Curr.Microbiol.App.Sci.2017.6(11): 1963-1972
DOI: https://doi.org/10.20546/ijcmas.2017.611.233


Ecological Engineering of Intercropping in Blackgram Promotes Services of Coccinellids and Suppress Aphis gossypii (Glover)
S. Lokesh1*, N. Muthukrishnan1, N. Ganapathy1, J.R. Kannan Bapu2 and E. Somasundaram3
1Department of Agricultural Entomology, TNAU, Coimbatore 641 003, Tamil Nadu, India
2Sethu Bhaskara Agricultural College and Research Foundation,Karaikudi Taluk, 630 306, Tamil Nadu, India
3Department of Sustainable organic agriculture, TNAU, Coimbatore 641 003, Tamil Nadu, India
*Corresponding author
Abstract:

We conducted a 2-year experiment in south India examining the effects of non-pulse intercrops (sunflower, sesame, sorghum, maize, marigold and okra) on the biocontrol services of predatory coccinellids on Aphis gossypii (Glover) in blackgram (cv. VBN 3). Blackgram + maize intercropping system significantly influenced maximum coccinellids on blackgram (4.67 adults/ plant) along with highest pest defender ratio (PDR) of 1: 2.31, occurrence ratio (OR) of coccinellids (1.43), minimum A. gossypii (5.48 nymphs and adults / terminal shoot), preference ratio (PR) of A. gossypii (1.10) and maximum BC ratio (1: 4.84). Blackgram with sunflower, marigold, sorghum, sesame and okra intercropping systems also effected for higher population of coccinellids; higher PDR and OR of coccinellids; and minimum A. gossypii and PR; and moderate BC ratios than blackgram alone (1.87 coccinellids/plant; 1: 0.37 PDR; 7.2 A. gossypii/terminal shoot; and BC ratio of 1: 2.11). Maximum coccinellids was also observed on maize with highest PDR followed by sunflower and marigold. Sorghum, sesame and okra had higher coccinellids. Olfactometer studies revealed the order of preference of coccinellids towards leaves and flowers as maize, sunflower, marigold, sorghum, sesame and okra.


Keywords: Ecological engineering, Blackgram, Intercrops, Coccinellids, Aphis gossypii.
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How to cite this article:

Lokesh, S., N. Muthukrishnan, N. Ganapathy, J.R. Kannan Bapu and Somasundaram, E. 2017. Ecological Engineering of Intercropping in Blackgram Promotes Services of Coccinellids and Suppress Aphis gossypii (Glover).Int.J.Curr.Microbiol.App.Sci. 6(11): 1963-1972. doi: https://doi.org/10.20546/ijcmas.2017.611.233