In vitro Evaluation of the Efficacy of Ginger and Coriander Ethanolic Extracts Against the Early Blight Disease Caused by Fungus Alternaria solani in tomato plants (Solanum lycopersicum)

Abstract

Tomato(Solanum lycopersicum) is one of the most popular and widely consumed vegetables grown worldwide. It is considered as an importance source of some vitamins and mineral salts. Tomatoes are attacked by many diseases and pests in Sudan, the important diseases in Sudan include; Damping off-of seedling, Tomato yellow leaf curl virus (TYLCV), powdery mildew, bacterial spot, fuzarium wilt, late blight and Early blight ,but the early blight has highly significant effects in Sudan . This study which conducted under laboratory condition of Plant Pathology, College of Agricultural Studies, Sudan University of Science and Technology during January- February 2016, to isolate and identify of causal pathogen the Early blight of tomato more over to investigate , the inhibitory effect of ethanolic extracts of ginger rhizomes and coriander seeds and standard fungicide (score 250EC) against the fungus A. solani (compared to control). Used Three concentrations of ethanolic extract of ginger rhizomes is 12.5% ,25% and75 %, coriander seeds 12.5% ,25% and 50% and fungicide (score 250Ec) 100% were used in addition to the control sure. The results showed that all concentrations of ethanolic extracts of all plants tested and fungicide exhibited significant high inhibitory effect against linear growth of tested fungus compared to control. The highest concentration of ethanolic extract of ginger rhizomes at 75%concentration caused the highest reduction (inhibition percentage) of mycelial growth of A. solani (95.6%), followed by ginger rhizomes at 25%and12.5% (93.3%,84.6%),coriander seeds at 12.5%(89%)and 50%(87.6%), the standard fungicide and coriander seeds at 25% (88% and 83.3%),respectively. Generally, the results showed that the antifungal activity increase with increase in extract concentration of ginger rhizomes, and decrease in extract concentration of coriander seeds .