journal of al-qadisiyah for pure science(quarterly)

Abstract

This study included obtained random samples of onion product with complete parts of it ,roots,stems
and leaves from places that culture with onion that belong to Al- Qadisia ,these samples included the
four types of onion,white,yellow,green and red.
The parts of onion were cultured in the lab on medium potato dextrose agar (PDA) in dispossoble petri
dish,after growth of fungi the species of fungi are identified and the percentage frequency of each
fungus were calculate .The fungi Alternaria alternate gived higher percentage frequency from other
fungi it about %66.66 in the red onion roots the second fungus is Aspergillus niger the percentage
frequency about %43.47 in yellow onion roots ,in fungus Fusarium oxysporium the percentage
frequency is %33.33 in red onion roots .The onion stems ,the higher number record from fungus
Penicillium notatium is about %38.88 in yellow onion stem ,the second fungus was Alternaria
tenussimia about %32 in white onion stem ,many numbers observed that isolated from onion leaves
like Curvularia lunata, the percentage frequency about %52.63 from the white onion leaves while the
fungus Alternaria alternate recorded %23.07 in green onion leaves and the fungus Penicillium
notatium record %21.05 from white onion leaves .
Key words: Onion ,Onions benefits, Fungi diseases ,Isolation and identification diseases fungi