2007•The Journal of Animal and Plant SciencesRequires access

SPREAD OF AGGRESSIVE ALIEN WEED PARTHENIUM HYSTEROPHORUS L. IN DISTRICT OKARA, PAKISTAN

Arshad Javaid, Tabinda Riaz

Abstract

Distribution of aggressive alien weed species Parthenium hysterophorus L. was studied in district Okara, Pakistan during September-October 2006. Eight waste and grazing lands, each of about 1 ha, were selected randomly in different parts of district Okara with 3–8 km distance between the two adjacent localities. P. hysterophorus was found in 7 out of 8 studied sites exhibiting 88% prevalence. The absolute and relative frequencies of P. hysterophorus were 36% and 2.56%, and absolute and relative densities were 0.56 and 2.71%, respectively. The frequency and density of P. hysterophorus were higher than 28 and 30 out of 38 weed species, respectively, identified from the studied areas.

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Key concepts: Parthenium hysterophorus, Weed, Alien, Biology, Parthenium, Grazing, Agronomy, Veterinary medicine