journal of kerbala university

The study was carried out to determine the effect of aquatic extract of some plants including Medicago sativa ,Datura innoxia ,D. metel , Ocimum basilicum , allium porrum and Apium graveolens on the growth of the pathogenic fungus ,Fusarium oxysporum F.sp. lycopersicon and protection of tomato plants from infection by this fungus Results of laboratory experiments showed that the aquatic extract of alfalfa , Medicago sativa , caused the highest rate of inhibition of fungus growth since the diametes of fungus culture reached only 4.31 cm ,whereas it reached 9.0cm in control treatment .Also ,all extracts were effective in reduction of the fungus sporulation compared with control treatment .Highest percentages of reduction in fungus dry weight were achieved by using M. sativa and O. basilicum extracts . These percentages reached 63.48 and 67.72 in the treatment of these two extracts , respectively. The extract of O. basilicum was the most effective among all other extracts in protection of tomato plants from infection by this fungus .The rate of infeation in plants treated with extract of O. basilicum was 2% while it reached 3.5 , 4 ,4.5 ,5 ,7 and 40.30 % in plants treated with extract of M. sativa , D.innoxia, D. metel, A. graveolens ,A.porrum ,respectively. The addition of dry powders of these plant to the soil contaminated by the fungus reduced the numbers of spores per each gram of soil .These numbers were 7165 , 7330,1835 ,3000, 3500 and 5170 spore per gram of soil in the treatment of six above _mentioned powdered plants ,respectively wthile it reached 26665 spore per gram in control treatment.