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Among various factors responsible for low yield, weeds infestation and their management is one of the important factors. Weed competes with crop plants for water, nutrients, space and solar radiation resulting in reduction of yield by 20 to 50% (Bhan, 1998). In order to sustain global agriculture food production, the importance of protecting arable crops against negative yield effect from weeds is well recognized. Cultural, mechanical and chemical methods are commonly used for controlling weeds. Unavailability of manual labour in peak season and unfavorable weather do not permit timely control of weeds. Therefore, weed control by mechanical means alone is not feasible.