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This study was conducted to investigate ‘Seasonal diversity and abundance of predatory arthropods (Insect pests and Spiders) in Bt and non-Bt cotton fields of Nalgonda district, Telangana state, India’ at farmers fields of Palem village, Nakrekal mandal, Nalgonda district, Telangana state, India. Sweep net and hand-picking methods were used for the collection of predatory arthropods (Predatory insects and spiders) on Bt and non-Bt cotton plants. Predatory arthropod species were identified with the help of the Guide on Cotton Pests and Predators by RARS, PJTSAU Warangal and Literature. During the study period, 09 predatory insects and 02 spiders on Bt cotton and 11 predatory insects and 03 spiders on non-Bt cotton were observed, which belonged to 12 different insect families and 03 spider families in 07 different orders. The seasonal abundance was lower in both Bt and non-Bt crops in the month of July 2019; gradually increased from July 2019 to November 2019 and then decreased from December 2019 to January 2020 on both Bt cotton and non-Bt cotton fields We noticed small differences in diversity and abundance of predatory arthropods between non-Bt and Bt during the 2019-2020 cotton season. We found 2 species of predatory arthropods in July, 6 species in August, 9 species in September, 10 species in October, 11 species in November, 7 species in December and 9 species in January on Bt cotton and 2 species in July, 5 species in August, 10 species in September, 12 species in October, 12 species in November, 9 species in December and 9 species in January on non-Bt cotton fields during the 2019-2020 cotton cropping year. We found a lower number of species in Bt cotton in comparison to non-Bt cotton fields. Ecological indexes were calculated for analysis of community structure of predatory arthropods.

Seasonal diversity, sweep net, hand-picking, predatory arthropods, Bt cotton, non-Bt cotton

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James C. Global status of commercialized Biotech/ GM crops: 2011. ISAAA Brief no. 43. ISAAA, Ithaca, NY; 2011.

Mayee CD, Rao MRK. Current cotton production and protection scenario including GM cotton, Crop report Cotton Agro look. 2002;14-16.

Annual report 50th-CCI. The cotton corporation of India Ltd. A Mini Ratna Company, Govt. of India Undertaking, Ministry of Textile; 2020.

Agriculture statistics at a Glance. Directorate of economics and statistics. Ministry of Agriculture. Government of India. 2018;2017-18.

Wilson AGL, Basinki JJ, Thompson NJ. Crop damage and control practices with irrigated cotton in a tropical environment. Cotton Grow. Rev. 1972; 49:272-282.

Lohar MK. Applied entomology. Second Edition. Published by Kashif publications, Hyderabad. 2001;34-38.

Mellet MA, Schoeman AS, Broodryk SW, Hofs JL. Bollworm (Helicoverpa armigera (Hubner)Lepidoptera: Noctuidae) occurrences in Bt and Non Bt-cotton fields. Marble Hall, Mpumalanga, South Africa. African Entomology. 2004; 12:107-115.

Bale JS, Van Lenteren JC, Bigler F. Biological control and sustainable food production. Phil. Trans. R. Soc. B. 2008; 363:761-776.

Sathe TV, Bhosle YA. Insect pest predators. Daya publishing house. 2001;1-69.

Sattar M, Abro GH. Mass rearing of chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae) adults for integrated pest management programmes. Pakistan J.Zool. 2011;43:483-487.

Wells ML, Mcpherson RM, Ruberson JR and Herzog GA. Coccinellids in cotton: Population respons to pesticide application and feeding response to cotton aphid (Homoptera: Aphididae). Environ. Ent. 2001; 30:785- 793.

Naikwadi Bhausaheb, Dadmal SM, Javalage Samadhan. Diversity study of predaceous insect fauna in major kharif crop agro-ecosystem in Akola Maharashtra (India). The Bioscan. 2015;10(4):1521-1524.

Turnbull AL. Ecology of the true spiders (Araneomorphae). Annual review of Entomolgy. 1973; 18:305-348.

Riechert SE, Lockley T. Spiders as biological control agents. Annual review of Entomolgy. 1984c; 29:299-320.

Garcia A, Gonzalez D, Leigh TF. Three methods for sampling arthropod numbers on California cotton. Environ. Ent. 1982; 11:565-572.

Van den Berg AM, Dippenaar-Schoeman AS, Schoonbee HJ. The effect of two pesticides on spiders in south African cotton fields. Phytophylactica. 1990; 22:435-441.

Dileep Kumar B, Malathi S, Har Prasad Rao N. Guide on cotton pests, regional agricultural research station (ANGRAU), Warangal; 2008.

Sisterson MS,d Tabashnik BE. Arthropod abundance and diversity in Bt and Non-Bt cotton fields. Environ. Ent. 2004; 33:921-929.

Wilson FD, Hollis M, Flint, Randy W, Deaton, David A, et al. Resistance of cotton lines containing a Bacillus thuringiensis toxin to pink bollworm (Lepidoptera: Gelechiidae) and other insects. J. Econ.Entomol. 1992; 85:1516-1521.

Flint HM, Henneberry TJ, Wilsons FD, Hoguin E, Parks N, Buehler RE. The effects of transgenic cotton, Gossypium hirsutum L., containing Bacillus thuringiensis toxin genes for the control of the pink bollworm, Pectinophora gossypiella (Saunders) and other arthropods. Southwest, Entomol. 1985; 20:281-292.

Dhillon MK, Sharma HC. Comparative studies on the effects of Bt-transgenic and nontrans genic cotton on arthropod diversity, seed-cotton yield and bollworms control. J. environ. Biol. 2013; 34:67- 73.

Pilcher CD, Rice ME, Obrycki JJ. Impact of transgenic Bacillus thuringiensis corn and crop technology on five non-target arthropods. Environ. Ent. 2005; 34:1302-1316.

Men XY, Ge F, Liu XH, Yardim EN. Diversity of arthropod communities in transgenic Bt cotton and non-transgenic cotton agro ecosystems. Environ. Ent. 2003; 32:270-275.

Aggarwal N, Brar DS and Buttar GS. Evaluation of Bt and non-Bt version of two cotton hybrids under different spacing against sucking insect pests and natural enemies. J. Cotton Res. Dev. 2007; 21:106-110.

Naranjo SE. Long-term assessment of the effects of transgenic Bt Cotton on the abudance of Non target arthropod natural enemies Environment Entomology. 2005; 34:1193-1210.

Brien RE. Seasonal abudance of arthropod predators in uncultivated Plants communities adjacent to cotton in the Lockyer valley, Southeast Queensland. University of Queensland. I.PM U Research paper. 1978;78(1).

Silberbauer L. Sources of beneficial insects colonizing cotton fields CRC Final report, cotton CRC Project Number. 2001;2(2):16.

Ge-Feng, Ding-Yang Qin F Ge, Ding YQ. The population energy Dynamics of predacius natural enemies and their pest control activity in Different cotton agro-ecosystem. Acta Entomologica sinica. 1996;39(3):266- 273.

Kengegowda N. Studies on the population dynamics and screening of Bt cotton hybrids against insect pests. M.Sc. (Agri.) Thesis, University of Agricultural Sciences. 2003;49-82.

Rajanikantha R. Performance of Bt Cotton against major insect Pests and their natural enemies under irrigated ecosystem, M. Sc. (Agri.) Thesis, Unvi. Agric. Sci., Dharwad, Karnataka, India; 2004.

Hegde M, Nidagundi JM, Biradar DP, Khadi BM, Udikeri SS. Reaction of few cotton hybrids against bollworm incidence under irrigated Conditions. In: International symposium on “Strategies for Sustainable Cotton Production-A Global Vision” 3. Crop protection, 23-25November 2004, USA, Dharwad, and Karnataka (INDIA). 2004a;129-131.

Wadhwa S, Gill R, S. Effect of Bt-cotton on biodiversity of Natural enemies. J. Biol. Control. 2007;21(1):9-16.

Hagerty AM, Kilpatrick AL, Turnipseed SG, Sullivan MJ, Bridges WC. Predaceous arthropods and lepidopteran pest of conventional Bollgard and Bollgard II cotton under untreated and disrupted conditions. J. Econ.Entomol. 2005;34(1):105-114.

Sun CG, Zhang QW, Xu J, Wang YX, Liu JL. Effect of Transgenic Bt cotton pests and transgenic Bt-CpTI cotton on the Population dynamics of main cotton pests and their natural enemies; 2003.

Head G, Moar W, Eubanks M, Freeman B, Ruberson J, Hagerty A, Turnipseed S. A multi-year,large-scale comparison of arthropod Populations on commercially managed Bt and Non-Bt cotton fields. Environmental Entomology. 2005;34:1257-1266.