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The present study was carried out to investigate that how rapidly Parthenium hysterophorus L., a native of tropical America, is colonizing and spreading on new wasteland areas. For this purpose a four hectors piece of land in Punjab University Lahore that has been fallow for the last two years was selected to study the colonization of Parthenium in comparison with the local flora. A total of 31 weed species were found at the selected site. Phytosociological study of the site revealed that Parthenium has become the third most frequent weed after Cynodon dactylon (L.) Pers. and Malvestrum tricuspidatum A. Gray and the most densely populated weed only second to C. dactylon at this site within the two years. Fast growth rate, high reproductive potential, adaptive nature and interference by allelopathy are the major contributing factors for rapid spread and successful establishment of this weed in any ecosystem
Arshad Javaid. (2006) PARTHENIUM WEED – AN EMERGING THREAT TO PLANT BIODIVERSITY IN PAKISTAN, , Volume 3, Issue 3.
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