Ikram et al. (2019) / J. Biosci. Agric. Res. 19(02): 1628-1638 https://doi.org/10.18801/jbar.190219.197 1628 Published with open access at journalbinet.com EISSN: 2312-7945, © 2019 The Authors, Research paper. Impact of biochemical changes on the development of powdery mildew of pea Amna Ikram 1 , Hafiz Muhammad Usman Aslam 2,3 , Owais Yasin 2 , Akhtar Hameed 2 , Qurban Ali 4 , Nasir Ahmad Khan 2 , Salman Ghuffar 5 , Waqas Ahmed Khan 2,3 and Faheem Ahmed 2 1 Department of Pest Warning and Quality Control of Pesticides, Punjab, Pakistan 2 Department of Plant Pathology, University of Agriculture, Faisalabad, Pakistan 3 Department of Plant Pathology and Microbiology, Iowa State University, USA 4 Entomological Research Institute, Ayub Agricultural Research Institute, Punjab Pakistan 5 PMAS Arid Agriculture University Rawalpindi, Pakistan. ✉ For any information: ask.author@journalbinet.com Article received: 09.10.18; Revised: 26.02.19; First published online: 14 March 2019. ABSTRACT Powdery mildew of pea is an air-borne disease of global dispersal. Erysiphe pisi, which is responsible for powdery mildew of pea is the major threat for pea production in Pakistan and in the world. Although other fungal pathogens such as Erysiphe baeumleri and Erysiphe trifolii have also been reported by initiating this disease on pea and involved in 25–50% yield drop. In the current study 6 varieties of pea from which 3 resistant (Peas 2009, No. 267, F-16) and 3 susceptible (PF-450, Climax and Mateor) were cultivated in research area of the Department of Plant Pathology, University of Agriculture Faisalabad to analyze the biochemical deviations in pea leaves after the induction of powdery mildew disease. The results indicated that among six chemical elements (P, K, Ca, Mg, Zn and Fe) potassium, calcium and zinc contents were higher (1.34 ppm, 2.14 ppm, 1.25 ppm respectively) in diseased leaves while phosphorus, iron and magnesium contents were decreased (0.72 ppm, 7.40 ppm and 0.35 ppm respectively) in diseased leaves as compared to the healthy leaves in both the reaction groups (resistant, susceptible). Keywords: Pea, Nutrients, Susceptible and Biochemical changes I. Introduction Plant diseases are the most important restraint to improve the production efficacy and the quality of crops as they diminish the nutrient availability, uptake, supply, or consumption by the plant (Dordas 2008). Pea (Pisum sativum) is a commonly grown crop in Pakistan and also in the world. This crop is Published with Open Access at Journal BiNET Vol. 19, Issue 02: 1628-1638 Journal of Bioscience and Agriculture Research Journal Home: www.journalbinet.com/jbar-journal.html Cite Article: Ikram, A., Aslam, H. M. U., Yasin, O., Hameed, A., Ali, Q., Khan, N. A., Ghuffar, S., Khan, W. A. and Ahmed, F. (2019). Impact of biochemical changes on the development of powdery mildew of pea. Journal of Bioscience and Agriculture Research, 19(02), 1628-1638. Crossref: https://doi.org/10.18801/jbar.190219.197 Article distributed under terms of a Creative Common Attribution 4.0 International License.