Abstract
The effectiveness of herbicides for selective control of annual ryegrass (Lolium rigidum) in oilseed rape (Brassica napus), field peas (Pisum arvense) and narrow-leafed lupins (Lupinus angustifolius) was investigated in nine experiments in north-eastern and southern Victoria. Of the herbicides tested, di-allate, trifluralin and simazine significantly reduced ryegrass populations in all experiments where they were used. Pre-planting incorporated treatments were generally more effective than post-sowing or post-emergence treatments in oilseed rape and field peas. Control of ryegrass generally resulted in higher grain yields in all three crops, although lupins showed the greatest response. Dalapon, applied to oilseed rape after emergence, caused flower distortion and reduced yields in some experiments.
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