The effect of 2,4'-dinitro-4-trifluoromethyldiphenylether (C-6989) on beans (Phaseolus vulgaris L.) under certain soil and light conditions Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/rb68xg673

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  • Oregon is the largest producer of green beans for processing in the United States. Because the repeated use of a single herbicide may lead to changes in the weed population, build up of residues, and other undesirable factors, a continuous search for new herbicides is taking place. C-6989¹[superscript /] has been registered and used in soybeans; however, the response of green beans to the chemical has not been studied in detail. In this work the following factors were studied: The tolerance of beans and other plants to C-6989, site of uptake, type and site of action of the herbicide and the extent to which mechanical conditions of the soil surface is responsible for herbicidal injury to bean seedlings. An evaluation was made of the residual effects of C-6989 in rotation crops. Results indicated that the herbicide is taken up by roots, shoot or combination of both, depending upon species. Applied at high rates on beans, the effects observed were that of a contact type herbicide. It appeared to block the photosynthetic process by destroying chlorophyll pigments. Under field conditions, a rate of 4 lb/A applied preemergence controlled a broad spectrum of weeds without harmful effects to five varieties of bean. Delays in the application of the herbicide after bean planting, as well as delays in irrigation, tended to cause crop injury. The residual life appears to be short enough under summer conditions to allow the planting of rotation crops without injury. ¹[superscript /] Trade name is Preforan. Chemical name is 2, 4'-dinitro-4-trifluoromethyl-diphenylether.
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