Herbicide Selectivity among Grain and Weedy Amaranthus Species1
- C. S. Endres and
- D. E. Longer2
The cultivation and evaluation of the grain amaranths Amaranthus hypochondriacus and Amaranthus cruentus as potential field crops has been initiated by several investigators worldwide. Because of their similarity to the grain amaranths, the pigweeds (Amaranthus spp.) represent a potential weed-control problem. To date, no research on chemical weed control in grain amaranth has been reported. Greenhouse herbicide screening studies were conducted on a Captina silt loam soil (fine-silty, siliceous, mesic Typic Fragiudults) to evaluate herbicide selectivity for control of smooth pigweed (Amaranthus hybridus L.) and Palmer amaranth (Amaranthus palmeri S. Wats.) without injury to the grain amaranths. Of the herbicides tested, bentazon [3-(l-methylethyl)-lH-2,l,3-benzothiadiazin-4(3H)-one 2,2-dioxide], naptalam [2-[(l-naphthalenyl-amino)carbonyl]benzoic acid} + dinoseb [2-(sec butyl)-4,6-dinitrophenol], and metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-l-methylethyl) acetamide] exhibited a degree of selectivitytowards A. cruentus or A. hypochondriacus. These findings offer encouragement for further studies on the effects of rates and time of application on herbicide selectivity for grain amaranths.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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