Management of powdery mildew of pumpkin through chemicals, nutrition and systemic acquired resistance
2014
Iqbal, R.T.
Powdery mildew of pumpkin caused by Sphaerotheca fuliginea is severe plant disease resulting in enormous yield losses worldwide. In present study, three disease management approaches were adopted based on chemicals, nutrient supplements and systemic acquired resistance. Efficacy of 5 chemicals, 2 nutrient supplements and 5 plant activators were evaluated at 3 different concentrations with one control of each against powdery mildew disease of pumpkin under field conditions. Seeds of a single powdery mildew susceptible pumpkin variety (Mahadeev) were cultivated at research area of the Department of Plant Pathology, University of Agriculture Faisalabad, during 2014 under randomized complete block design (RCBD) with three replications. The collected data was analyzed statistically and means were compared by using Least Significant Differences (LSD) test. Among chemicals, minimum disease incidence was expressed by Difenconazole (15.50%) followed Topsin-M (15.66%), Copper hydroxide (18.06%), Chlorothalonil (22.22%) and Sulfur (24.81 %) as compared to control (47%). Among nutrient supplements, minimum disease incidence was expressed by Macronutrients (16.64%) followed by Micronutrients (19%) as compared to control (44.54%). Among plant activators, minimum disease incidence was expressed by Salicylic acid (18.67%) followed by Benzoic acid (24.71%), K2HPO4 (27.36%), KH2PO4 (28.50%) and Citric acid (30.11 %) as compared to control (80.50%). Difenconazole @ 3g/L, Macronutrients @ 1.5% and Salicylic acid @ 0.5% concentrations performed better against powdery mildew of pumpkin; among all chemicals, nutrient supplements and plant activators. Present study concludes that all treatments, concentrations, sprays and their different interactions show significant result against powdery mildew disease.
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