EFFECT OF HERBICIDES ON CRTAIN ROOT ROT DISEASE OF SEASAME IN NINAVEH PROVINCE

Labrotory test of four herbicides on growth of fungi (Pythium aphanidermatum, Macrophomina phaseolina and Fusarium solani) showed that focusultra inhibited the growth of pathogenic fungi causing root rot disease, while the effect of the herbicide on percentage and severity of disease showed that all herbicides except treflan gave aprotection for plants during three months, and the symptoms of the disease appeared later .Focusultra was the best herbicide for reducing the percentage and severity infection which were 10 % and 0.04, respectively. Results of field and greenhouse experiments were applicated together.