The present investigations were conducted at the Experimental Farm of the Agriculture Research Station, Arab-El-Awamer (Abnoub district), Assiut Governorate during 2013 and 2014 soybean growing seasons.The obtained results showed that the populations of T. tabaci and B. tabaci started in a few numbers on all soybean varieties during the first week of July in 2013 and 2014 seasons.The peak populati...