A field experiment was undertaken to evaluate the performance of different weed control treatments in cluster bean during kharif, 2011 at Tabiji, Ajmer in randomized block design with three replications. Treatment of weed free check was found best by recording highest values of yield attributes, seed (12.20 q/ha), haulm (32.16 q/ha) and biological yield (44.36 q/ ha) with maximum weed control efficiency at successive stages. It was at par with Pendimethalin 1.0 kg/ha (PRE) + one hand weeding,

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... azethapyr 40 g/ha and imazethapyr 60 g/ha at 20 days after sowing (DAS). Among different herbicides treatments, imazethapyr 60 g at 20 DAS showed highest values of yield attributes, seed yield (11.65 q/ ha), haulm yield (31.12 q/ ha), weed control efficiency ( 90.1, 88.0 and 83.9 per cent at 30, 60 DAS and at harvest, respectively) and minimum weed index (4.7). In monetary term also imazethapyr 60 g/ha recorded higher net returns (Rs 69030/ha) and benefit-cost ratio (5.31) than season long weed free check (Rs 66990/ ha and 4.05, respectively) on account of higher cost of cultivation involved in latter treatment to a tune of Rs 5930/ ha. Cluster bean (Cyamopsis tetragonoloba), vernacularly known as 'Guar', is a drought hardy leguminous, rainy season crop of semi-arid and arid regions of India. Presence of 30-35 per cent galactomann (gum) in its endosperm has changed it from a conventional crop to industrial crop. India ranks at top position in the world trade for guar gum and earns lot of foreign exchange by its export. Rajasthan ranks first in both area (33.2 lakh ha) and production (12.6 lakh tones) of cluster bean which constitutes 80.5 and 78.2 per cent of total area and production in the country, respectively.