it is not yet demonstrated beyond doubt that isolated chemicals are actually responsible for allelopathic activity under field conditions. Furthermore, possible joint action of che- micals in determining allelopathic activity is an area of study that largely remains neglected. We can employ molecular and biotechnological tools to study the genetic control of quantitative trait and mapping of genes (Olofsdotter, 2001). Duke et al. (2000) state ‘‘We speculate that biotechnology may eventually allow for the production of highly allelopathic crops through the use of transgenes to increase allelochemical production to levels that effectively manage weeds without herbi- cides or with reduced herbicides input’’. Fischer et al. (1997) suggested that a little compromise with the crop yield in favor of better competitiveness is a profitable deal, particularly in view of the high cost of weed control and environmental hazards associated with the overuse of herbicides. We need to pay more attention to employ allelopathy as an alternate weed management strategy. With recent sophisticated molecular and biotechnological tools, the importance of allelopathy can be better explored and understood in weed management.