Induction of resistance in onion against purple leaf blotch disease through chemicals
Muhammad Younas1, Muhammad Atiq1, Nasir Ahmed Rajput1, Wasim Abbas2, Muhammad Rizwan Bashir2, Salman Ahmad3, Muhammad Sami Ullah1, Waqas Ashraf Bhatti4, Nadia Liaqat1, Irfan Ahmad5
1Department of Plant Pathology, University of Agriculture, Faisalabad, Pakistan
2Plant Pathology Section, PPRI, Ayyub Agricultural Research Institute, Faisalabad, Pakistan
3Department of Plant Pathology, College of Agriculture, University of Sargodha, Sargodha, Pakistan
4Department of Plant Pathology, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
5Department of Forestry and Wildlife, University of Agriculture, Faisalabad, Pakistan
Abstract
Onion is one of the world’s most important vegetable crop cultivated in Pakistan and plays a significant role in human diet. Numerous diseases attack on onion crop, but purple leaf blotch is the most important one, because it causes 80 to 90% of onion yield loss all over the world. In current experiment twenty-three fungicides at three concentrations (0.5, 1, and 1.5 g/L) were evaluated against Alternaria porri causing purple blotch under Randomized Complete Block Design (RCBD) on susceptible variety of onion (Pink Panther). Among all fungicides, chlorostrobin expressed prominent results causing 62.05% reduction in disease severity, followed by Nanok (61.55), Shincar (54.86), Cabrio top (53.33), Thril (50.00), Jalwa (48.11), Success (45.00), Alliette (41.61), Rally (39.83), Copper oxychloride (36.66), Score (33.05), Topas (29.88), Melodydue (13.27), Dithane M (11.66), Sulphax (6.55), Ridomil Gold (3.38) % respectively as compared to control. Similar results were observed in case of interaction b/w treatments and their concentrations. Results of current study are helpful for farmers, scientist, and researchers for timely management of purple leaf blotch disease of onion.
