Influence of weed density on efficacy of two soil-applied herbicides Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ff3658132

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  • Several studies were conducted to determine the effect of weed density on herbicide efficacy. Diuron [3-(3, 4- dichlorophenyl) -1, 1- dimethylurea] was tested on various densities of Italian ryegrass (Lolium multiflorum Lam. ) under greenhouse and field conditions. Cycloate (S-ethyl N-ethylthiocyclohexanecarbamate) was tested on green foxtail (Setaria viridis (L. ) Beauv. ) in the greenhouse. Under both greenhouse and field conditions, control of Italian ryegrass decreased as plant density was increased. This trend was observed at extremely high densities and also at densities commonly observed in the field. Similar results were obtained from cycloate on green foxtail. Not all experiments showed this trend, however, and further research is needed to determine the reasons for this inconsistency. Diuron is a nonvolatile herbicide that enters the plant primarily through the roots and inhibits photosynthesis. Cycloate is a volatile herbicide that is taken up by the shoot and affects the meristematic region of the grasses. These differences suggest that the observed results may not be limited to the herbicides and plants studied.
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