First record of powdery mildew of Egyptian acacia (Acacia rubra Mill.) in Mosul / Iraq

Abstract

First record of Egyptian acacia (Acacia rubra Mill.) powdery mildew disease was recorded in Iraq / Mosul , the infected trees were cultivated as road sides and for ornamental as the beauty of its flowers this was in Al-Arabee situation in Mosul , field survey were done threw autumn / 2013 up to spring / 2014 , especially at May and the infecting percent were (25-60 %) incorporation , Symptoms at upper surface of leaves were appeared as a white color powder and then developed to lower surface , Microscopic test were done, conidia and conidiophore noticed under microscope , conidia had barrel shape , its dimension the same of Oidium spp. This genus is the conidial stage of powdery mildew, there were no sexual stage appeared threw the test . Pathogenicity results showed high pathogenicity ability with acacia seedlings which reached to 100 % of infection ratio after artificial inoculation