Abstract
This study aimed was to diagnose the causal agent of decline Apricot trees in Nineveh governorate, Pathogenicity , and effects on site infection contents of Salicylic acid for tested cultivars tissue.Phaeoacremonium aleophilum W.Gams, Crous was identify as a major pathogen of decline apricot tree and this is considered the first record of this fungus on apricot in Iraq, and was accompanied with Monilia sp. Percent 15 %.Result of Pathogenicity trial of P.aleophilum and Monilia sp. on apricot local cultivars (LC)Abo-zyngeel showed that P.aleophilum was most aggressive when caused twig decline and stem cankers.(Quzany ,Affly ,Turkey , Abo-zyngeel and Qussay). The highly disease severity was recorded on Qussay and Affly LCs. with 0.63 and 0.65 respectively along with the canker length of about 1.33 and 1.2 cm respectively after one month from inculcation .P.aleophilum showed ability to induce Salicylic acid production in some LC's. particularly on Qussay LC after 2 hours of inculcation (0.758 %), in Turkey LC significant increasing was recorded after one months (0.592%).
