Abstract
A survey of weeds, endemic to cotton crop, was carried out in four districts of Multan Division. It was ascertained that major portion of weed flora infesting cotton fields comprised of monocots. amall rotunduS L. was the most prominent weed with 100Z distribution and formed denser stands than all the other weeds, it showed a mean density and frequency of 52.2 and 66.0a respectively and was followed by lanclEri. dactylon Pers. The next frequency positions were occupied by divots viz. Convolvulus arvensis L.,Trianthema maRayn2 L.,Tribulus terrestris L., Amarantus viridie L..Liphorbia prostrata Ait., and Corchorus tridens L. respectively.
INTRODUCTION
Weeds deteriorate the quality and quantity of the produce in all crops. Weeding is done to reduce conpetition of weeds with crops and avoid other harmful effects. These losses caused to crops depend on the type and densiky of weed infestation (Swan, 1g7I., Wyse et al., 1986). Therefore,quantitative analysis of weeds in crops is a prerequisite for developing econotaicallyand ecologically sound weed control programes. Such studies have been recently reported for some crops in various parts of Pakistan such as wheats Of Punjab (Saeed et al.} 1979), wheats of Quetta (Hussain et a1.,1985), and maize fields at Kotli ( Hussain and Malik, 1986). Distributional survey for cotton infesting weeds has been reported for six weed species only (Sneed et al., 1979). In the present studies quantitative analysis of cotton infesting weeds was taken up in Multan Division,
