Vol. 4, Issue 2 (2019)
Eco-friendly management of Phytophthora infestans causing late blight of potato
Author(s): Rao Asim Ali Khan, Muhammad Usman Ghazanfar, Waqas Raza
Abstract: The traditional defense of potato plant against potato late blight caused by Phytophthora infestans involved the frequent use of synthetic chemicals but due to development of resistance in most common pathogenic fungi against chemicals and also its residual effect on human health has given a push for obtaining alternatives strategies. Therefore, in the present study, five plant extracts were evaluated namely, Azadirachta indica (Neem), Moringa oleifera (Sohanjna), Acacia nilotica (Keekar), E. camaldulensis (Safeda) and C. limon to test antimicrobial activity against P. infestans. Experiment was arranged out in Completely Randomized Design (CRD) with three replications by poisoned food technique. Mycelial development and inhibition percentage of P. infestans were recorded following 3, 5 and 7 days post application. The result revealed that all the plant extracts significantly inhibited the mycelia growth of the pathogen when compared with control. However, among all plant extracts, A. indica (59.77%) was significantly superior over other treatments followed by M. oleifera (50.61%), A. nilotica (43.65%), E. camaldulensis (38%) and least inhibition was observed in C. limon (24.68).The result of present study suggested that neem extract was found most effective for controlling late blight of potato.