International Journal of Environmental Sciences

Volume 3 Issue 3 2012- November 2012    Pages: 1155-1160  <<Previous    Next>>

Study on infestation of cotton insect stainers on BT-cotton and non BT-cotton in Warangal, Andhra Pradesh

Author Information:

Chintha Sammaiah, Laxman. P, Ch.Samatha

Department of Zoology, Environmental Entomology, Kakatiya University, Warangal-506009, Andhra Pradesh, India

ABSTRACT

Cotton insect strainers,   Dysdercus cingulatus Fabricius (Red cotton bug) and Oxycarenus hyalinipennis Costa, (Dusky cotton bug) were recorded as a major pest of Bt-cotton and non Bt-cotton in agricultural fields of Warangal, Andhra Pradesh, India. The percentage of infested plants ranged from 5 to 40% in Bt-cotton and 1 to 31% in non Bt-cotton during October-2011 to March-2012 by red cotton bug. The percentage of infested plants ranged from 2 to 41 in Bt-cotton and 2 to 35 in non Bt-cotton during October-2011 to March-2012 by Dusky cotton bug. Surveys were conducted every week after sowing of seeds for infestation of plants in both crops. D. cingulatus infestation started in 16th week of Bt-cotton crop and 17th week of non Bt-cotton.   The maximum infestation 45.33% was recorded in 28th week of Bt-cotton crop, 37.33% in 27th week of the non Bt-cotton. The infestation of O. hyalinipennis  started in 17th week of Bt  and non Bt-cotton crops and  reached peak infestation 46.33%,in  Bt-cotton and 38%  non Bt-cotton  in 29th week of both crops.

Keywords: Red cotton bug, Dusky cotton bug, Bt -cotton and non Bt-cotton, Warangal.

DOI:10.6088/ijes.2012030133023

© 2012 Copyright by the authors, licensee Integrated Publishing Association.This is an open access article distributed under the Creative Commons Attribution License (3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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