The effect of pictoram (Tordon 22K) in the control of white horsenettle under irri gated and dryland conditions was studied. Ten treatments consisted of Tordon 22K at 6. 12 and 18 lit/ha, Tordon 22K at 6 lit/ha plus 0.5, 1.5 and 2.5 kg a.i. of 2,4-D/ha, Tordon 22K at 6 lit/ha applied at 4, 8 and 12 monthly intervals and an untreated control. The population of white horsenettle was estimated four months after the final spray. The results indicated highest degree of weed control (90 per cent) with Tordon 22K at 6 lit/ha) applied at four-monthly intervals.
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