author(s)
Vivek Uppar, Ganesha Halikatti and G Suresh

abstract
To study the performance of different sticky colour traps against thrips in Bt cotton, a field experiment was conducted in a factorial randomized bock design (RBD) using RCH-2 Bt genotype at ARS, Dharwad Farm, during Kharif 2012-13 and 2013-14. Performance of colour sticky traps at 15 DAS, white colour trap attracted more number of thrips population (1.55/ 10 cm²) and least in light green colour trap (0.56/ 10 cm²). Irrespective of colours the trap installed at 30 cm height recorded more number of thrips (2.01/ 10 cm²) when plant height was 28.5 cm. Interaction effect showed significant difference as white colour trap at 30 cm trap height attracted more number of thrips (3.40/ 10 cm²) and found to be superior compared to other colour traps and trap heights. However, irrespective of the colours 30 cm, 60 cm and 90 cm trap heights were suitable for recording more number of thrips at 15 – 30 DAS, 45 – 60 DAS and 75 - 90 DAS, respectively.