The genotoxic effects of insecticide cymax5% was examined on the root tip meristem cells and meiotic cell divisions of the two Varieties of Vicia faba plants ( Giza 843 and Giza 716) .Mitotic index decreased and chromosomal aberrations increased by increasing of the concentration of insecticide. The chromosomal anomalies include stickiness, fragment, star-shaped, bridge and c- metaphase .The percentage of abnormal pollen mother cells, (PMCS) increased as the concentration and treatment period increased. The most common abnormalities were stickiness, disturbed, laggard, bridges, ring and micro- multinuclei. These results showed that the types of abnormalities were more or less common in both the varieties but the percentages of aberrations were comparatively higher in Variety Giza 716 indicating its greater sensitivity to Cymax5%