Preventative measures: Preventing dense populations of Commelina benghalensis from establishing in agricultural areas helps avoid the accumulation of large seed banks. Cultivation of a cover crop can be used to smother emerging and established populations of C. benghalensis, however mechanical or chemical removal may be needed prior to planting the cover crop. Increasing the density of plants in soybeans and doubling rows in corn helps control and shade out C. benghalensis (Flanders, 2007; NAPPO, 2003; Prostko, 2005).
Physical: Removal by pulling or use of a tool such as a hoe, or mechanical cultivation have a varying, but usually low, degree of success due to the regenerative properties of C. benghalensis. In one study, comparing conventional tillage to strip tillage, conventional tillage was shown to have a much lower density (3 plants/m2 versus 60 plants/m2) of C. benghalensis in a weed count performed after peanuts and cotton were planted (Brecke, 2007; NAPPO, 2003).
Chemical: The use of herbicides with residual activity to combat C. benghalensis is often most effective because of the weed's ability to germinate through out the growing season. C. benghalensis is resistant to glyphosphate in "Roundup Ready" cotton . In one study, adding metachlor to the first glyphosphate application increased control to 96% under conventional tillage and 75% under strip tillage with 50% soil disturbance. According to Prostko (2005), "Dual Magnum" is the most effective residual herbicide to control C. benghalensis in cotton crops. Prostko also suggests "Dual Magnum" application in peanuts for successful suppression, especially if at least 0.5 inches of rain or irrigation is received within 7-10 days. Early post-emergence applications of herbicide should be performed before seedlings of C. benghalensis reach 3-4 inches (Brecke, 2007; Flanders, 2007).
Integrated management: Pieces of cut stems of C. benghalensis, usually cut during physical eradication or cultivation, have the ability to survive a short period of drought stress and resprout. Stem segments must desiccate to a moisture content of 50% for a period of 30 days to reach a 0% regeneration rate, however the size of the stem segment may lengthen the period of viability (Grey, 2007).
Location Specific Management Information
Commelina benghalensis is listed as a 'Class A noxious weed' in Alabama (USDA NRCS 2008).
Commelina benghalensis is listed as a 'Quarantine pest' in California (USDA NRCS 2008).
Commelina benghalensis is listed as a 'Noxious weed' in Florida (USDA NRCS 2008).
Commelina benghalensis is listed as a 'Class A noxious weed' in North Carolina (USDA NRCS 2008).
United States (USA)
Commelina benghalensis is listed as: a 'Noxious weed' in the USA; a 'Prohibited' weed in Massachusetts; a 'Prohibited noxious weed' in Minnesota; a 'Quarantine' pest in Oregon; a 'Plant pest' in South Carolina and a 'Class A Noxious weed' in Vermont (USDA NRCS 2008).
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