Effect of aqueous and alcoholic leaves extract of Platanus occidentalis L. in Cupressus sempervirens root rot.

Abstract This study was conducted in the laboratory and nursery of the Department of forest sciences, College of Agriculture and Forestry/ University of Mosul, the aim of this study was to investigate the seasonal distribution of root rot disease, which causes severe damage to cypress seedling Cupressus sempervirens L. , this study showed through a field survey conducted of some private and public nurseries in Mosul city during September and the November of 2020 and January , March, May and July of 2021, as it was found that the highest rate of infection with the disease was in May 2021, it amounted to 22%, and that the lowest rate of infection was in January of the same year,which amounted to 8%, Fusarium solani was appeared at highest rate 50% in July 2021, and the lowest rate of isolation reached 8.33% of Rhizoctonia solani in September 2020 and January 2021. The results of study concentrations effect of Platanus occidentalis L leaves extract on fungal growth rates showed that alcoholic extract had the highest inhibitory effect on the growth of Rhizoctonia solani fungus, which was 100% at the fourth concentration than the first concentration of aqueous extract which showed the lowest inhibition rate 3.75%