Abstract
Maize (Zea mays L.) is an important food crop worldwide. Some Fusarium species cause maize ear rot leading to significant yieldlosses and, for Fusarium verticillioides, potential risk of mycotoxin contamination and produces Fumonisin mycotoxins .a survey ofpopulation composition of Fusarium species on maize in Iraq representative important task due to high infection in maize plants ineach field. The aim of this study survey the frequency of fungi associate with maize ears .The result showed that the Fusariumspecies isolates were highly frequent in all plant parts , F. verticillioides out off Fusarium spp were highest frequency found in allmaize samples, it was showed frequency percentage 45%. PCR assay are more accurate for identification Fusarium spp. compared toconventional cultural approaches. Conclusion that Fusarium species representative common pathogen on maize plants.