Parthenium hysterophorus has become a major weed of various areas of the country in a relatively short time. In the present study the detailed survey of district Sialkot with total 53 sites was conducted to evaluate the extent of infestation of Parthenium hysterophorus. Along with P. hysterophorus a great number of other weeds were also observed during the survey. Among the waste lands of Sialkot infestation of P. hysterophorus was more than 50%, along the road side was 60%, the waterways 46% and along the crop fields was 56% and at the banks of rice fields and Trifolium sp. and in fallow...