Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Biocontrol potential of four deadly strains of Alternaria macrospora isolated from Parthenium weed.

Abstract

Parthenium hysterophorus is a weed of global significance causing severe economic, environmental, human and animal health problems in Asia, Africa, Australia and the Pacific. A field survey and the systematic sampling were made during two years (November 2012 to October 2014) in KUK campus and its surrounding area. During a series of extensive surveys for natural enemies of Parthenium hysterophorus, leaf spot diseases creating epiphytotics were regularly observed on P. hysterophorus. The organism was isolated from the affected parts of the Parthenium by following the standard isolation techniques using Potato Dextrose Agar (PDA) and Parthenium Dextrose Agar (PeDA) medium. Koch's postulate was performed and found satisfactory for all the isolates and proved to be pathogenic to this weed. On the basis of cultural, morphological and molecular characteristics, these pathogens were identified as different strains of Alternaria macrospora. The literature survey indicates that Alternaria macrospora has never been reported on the Parthenium weed and it is the first report of occurrence of this pathogen causing leaf spot on Parthenium weed from the world. Further study will be conducted to develop mycoherbicide by using these fungal pathogens in combination or single.