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Control of weeds in sugar beets beta vulgaris cultivar mono hy d 2 with hand hoeing and herbicides

Control of weeds in sugar beets beta vulgaris cultivar mono hy d 2 with hand hoeing and herbicides

Weed Science 31(4): 493-499

Handweeding sugarbeets (B. vulgaris L. 'Mono Hy D2') for 8 wk after planting prevented sugarbeet yield losses. Weeds invading sugarbeet plots at the 2-leaf stage (4 wk after planting) reduced sugarbeet yield 26%. Cycloate (S-ethyl N-ethylthiocyclohexanecarbamate) caused more visual sugarbeet injury and stand reduction than did ethofumesate [(.+-.)-2-ethoxy-2,3-dihydro-3,3-dimethyl-5-benzofuranyl methanesulfonate]. Broadleaf and grass weeds differed in their response to cycloate and ethofumesate, but overall, total weed yields were lower in plots treated with cycloate. Ethofumesate injured sugarbeets more when applied before planting and incorporated into the soil than when applied preemergence. Herbicides applied when sugarbeets had 4-6 leaves generally injured sugarbeets less, but controlled weeds less effectively, than when sugarbeets had 2-4 leaves. None of these herbicide treatments were as effective as handweeding in providing season-long weed control. Every 1120 kg/ha of oven dry weeds present in sugarbeet fields corresponded to a decrease in sugarbeet root yields of 10,000-11,500 kg/ha.

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Accession: 005051882

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