Field experiment was conducted at the Main Agricultural Research Station, University of Agricultural Sciences, Raichur during 2012-13 to identify and evaluate the suitable refuge strategy systems for pink bollworm resistance management in Bt cotton (Gossypium hirsutum L.) cultivation. The experiment was laid out in randomized complete block design with nine refuge systems : 0 % N-Bt (BIR), 5 % N-Bt (BIR), 10 % N-Bt (BIR), 15 % N-Bt (BIR), 20% N-Bt perimeter refuge, 100% Non Bt, 50% Non Bt, 10% structured refuge and 20% structured refuge as treatments with three replications in replacement series. Significantly lowest incidence (3.55 larvae/plant) and number of bolls with exit holes (11.22) due to pink bollworm was recorded in 0% BIR (41.25 q/ha) followed by 5 % N-Bt (BIR) with yield of 38.74 q/ha and this was on par with 10 % N-Bt (BIR) with yield of 37.79 is next best refuge systems with Bt cotton for higher production and greater economic benefits.
BIR (Built in refuge), Cotton, Larval incidence, Pink bollworm, Structure refuge
Durant, J. A. (1995). Efficacy of selected seed mixes of transgenic Bt and nontransgenic cotton against bollworms and tobacco budworms in South Carolina. pp. 769–771. In Proc. Beltwide cotton conf., San Antonio, TX. 4–7 Jan. 1995. Natl. Cotton Counc. Am, Memphis, TN.
Hardee, D.D., Van Duyn, J.W., Layton, M.B. and Bagwell, R.D. (2001). Bt cotton, continued effectiveness by managing resistance of tobacco budworm and bollworm. USDA-ARS-154. USDA-ARS, Stoneville, MS.
Kranthi, K.R. and Kranthi, N.R. (2004). Modelling adaptability of cotton bollworm, Helicoverpa armigera (Hubner) to Bt-cotton in India. Current Sci., 87(8): 1096-1107.
Kranthi, K. R., Jadhav, D. R., Kranthi, S., Wanjari, R. R., Ali, S. and Russell, D. (2002). Insecticide resistance in five major insect pests of cotton in India. Crop Protection, 21: 449-460.
Mallet, J. and Porter, P. (1992). Preventing insect adaptation to insect-resistant crops: Are seed mixtures or refugia the best strategy? Proc. R. Soc. Lond., 250:165–169.
Manjunath, T. M. (2012). Bt-cotton: refuge in seed-mix – some clarifications on its need and viability. Current Sci., 102 (4): 541-542.
Qiao, F.; Huang, J., Rozelle, S. and Wilen, J. (2010). Natural refuge crops, buildup of resistance, and zero-refuge strategy for Bt cotton in China. Sci. China Life Sci., 53:1227-1238.
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