Vol. 1, Issue 5 (2016)
Management of early blight of tomato through the use of plant extracts
Author(s): Waqas Raza, Muhammad Usman Ghazanfar, Yasir Iftikhar, Kanwer Shahzad Ahmed, Naveed Haider, Muhammad Hamid Rasheed
Abstract: Early blight of tomato caused by Alternaria solani (Ellis & Martin) Sorauer is the most serious and destructive disease worldwide. In the present study, five plant extracts were used viz; Azadirachta indica (Neem), Allium sativum (Garlic), Parthenium hysterophorus (Chatak Chandni), Datura stramonium (Datura) and Eucalyptus camaldulensis (Safeda) against this disease. Experiment was laid out in Completely Randomized Design (CRD) with three replications by poisoned food technique. Mycelial growth and inhibition percentage of A. solani were recorded after 3, 5 and 7 days post application. All the tested plant extracts significantly inhibited the mycelial growth of the pathogen when compared with control. However, among all five tested plant extracts Azadirachta indica (69.65%) was significantly superior over other treatments followed by Allium sativum (66.15%), Parthenium hysterophorus (59.94%) and Datura stramonium (49.46%). Least inhibition was observed in Eucalyptus camaldulensis (49.31%). Overall results demonstrated that all the tested concentrations of Azadirachta indica were found significantly effective for controlling early blight of tomato.