author(s)
Naresh Dhakar, MS Ansari, Manish Singh and Vivekanand Sharma

abstract
An experiment was conducted during rabi season of 2014, department of plant protection, Aligarh Muslim University, Aligarh, Uttar Pradesh, India to study the compression between different sampling techniques of thrips (Thrips tabaci) of onion the crop varieties (Onion white and Nasik red) was sown in randomized complete block design with plant spacing of 30cm between rows and 15 cm within plants in 16 plots. Results revealed thatMaximum demonstrated of T. tabaci, damage, eggs and other insect pests were in March and April. The infestation, population and laying eggs of T. tabaci are started from inner bases of leaves then gradual spreading on leaves. The most common predators found were spiders and coccinellidae species. Therefore, more investigations on natural enemies; spiders and coccinellidae predators and their potential for control T. tabaci are desired for more than 3 years constantly. The BST were consistently captured and detected adult thrips earlier than other sampling methods, and could be used instead of other samplings early in the season to monitor activity of thrips. The major influence abiotic factors either reduction or increasing population, damage and eggs of T. tabaci were the temperature (positive relationship) and relative humidity (negative relationship).