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Erysiphe diffusa a New Record for Powdery Mildew Fungi from Pakistan Breeding

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AFSHAN AKBAR, SALIHA AFZAL, NAJAM UL SEHAR AFSHAN, MUHAMMAD FIAZ & ABDUL NASIR KHALID

Biologia (Lahore), Vol.70, Iss. 1, Pages 16-19

Abstract

During mycological field surveys in 2021, infected leaves of Lespedeza tomentosa(Erysiphe diffusa a New Record for Powdery Mildew Fungi from Pakistan Breeding) were gathered from District Swat and Battagram, Khyber Pakhtunkhwa, Pakistan. The infection symptoms seemed to be white powder on foliage with numerous tiny blackened to brownish round ascomata. The causal agent was recognized as Erysiphe diffusa based on molecular and morpho-anatomical analyses. This is the first report of Erysiphe diffusa on Lespedeza tomentosa from Pakistan.

Introduction

A group of infective fungi belonging to Erysiphaceae, commonly known as powdery mildews, are causing a serious disorder on approximately 10,000 angiosperm plants species (Bradshaw & Tobin, 2020; Amano, 1986). From Pakistan, only 50 species in 10 genera of Erysiphaceae are confirmed. Erysiphe R. Hedw. is the biggest genus of Erysiphaceae with twenty-two species in Pakistan, (Afshan et al., 2021; 2022; 2023). Previously, two species of Erysiphe i.e. E. communis (Wallr.)(Erysiphe diffusa a New Record for Powdery Mildew Fungi from Pakistan Breeding) Schltdl. and E. glycines var. Lespedezae (U. Braun & R.Y. Zheng) were observed on the plant genus Lespedeza Mich., worldwide (Manjunatha et al., 2020; Far and Rossman, 2012). Genus Lespedeza comprises about 40 species, found in East and Tropical Asia, Tropical Australia and Temperate North America. Five species of Lespedeza occur in Pakistan. During field scrutiny in Khyber Pakhtunkhwa, plants of Lespedeza with a white powdery mildew fungus on the leaves were found in Swat, and Battagram districts. (Erysiphe diffusa a New Record for Powdery Mildew Fungi from Pakistan Breeding)They were collected, dried and labelled.
Microscopic and molecular phylogenetic investigation of parasitized plants indicate that the causing agent of the disease is associated with Erysiphe.(Erysiphe diffusa a New Record for Powdery Mildew Fungi from Pakistan Breeding) A thorough explanation is provided including illustrations of morpho-anatomical structures and a phylogram to demonstrate its accurate taxonomic position with the genus Erysiphe.

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