Abstract
Field study was performed during the agricultural season of 2013/2014 at Al Hamdaniyya district in Nineveh governorate. The study included two approved varieties of barely cultivation; Iba’a 99 and Al Khair. These two varieties were artifically inoculated with Barley yellow dwarf virus (BYDV), the infection was inflicted by resident aphids on two different stages of the crop growth (three leaves stage and tillering stage). The results showed that the loss in the crop yield due to the infection varied from one variety to the other and from one period of age to other during the infection. In addition, the results showed that using pesticide Gaucho (Imidacloprid) lowered the infection rate of BYDV in both varieties examined, in addition to increase of the production compared to the non-treated inoculated plants.
