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d) Chemical Control: The selection of a herbicide depends on the area of <br />infestation. 1-lerbicides that can be used independently or in <br />combination according to EPA recommendations are picloram (Tordon <br />22K) or any other EPA approved chemicals. <br />Field bindweed (Convolvulus arvensis): Field bindweed is a creeping deep rooted <br />perennial that reproduces by seed and horizontal roots. It is a difficult plant to <br />control because the seeds can survive in soils for up to 40 years. <br />1. Control Measures <br />a) Cultural Control: Plant competition from various grasses can be a very <br />effective management tool. Revegetation with aggressive desirable <br />perennials in disturbed areas can assist in preventing an infestation. <br />b) Mechanical Control: Mechanical- control can be accomplished by <br />disking or cultivating every three weeks throughout the summer. <br />This is not practical at Cyprus Henderson. <br />c) Biological Control: No biological control techniques are currently <br />approved for Field bindweed. <br />d) Chemical Control: There are numerous herbicides labeled for use on <br />Field bindweed. The selection of a herbicide depends on the area of <br />infestation. Some herbicides that can be used independently or in <br />combination according to EPA recommendations are picloram (Tordon <br />22K}, dicamba (Banvel(+2,4-D)), 2,4-D (Weedpro #6 Lovol), glyphosate <br />(Roundup, Rodeo) or any other EPA approved chemicals. Rodeo is <br />approved for aquatic use and can be applied directly over water. <br />Houndstongue (Cynoglossum officinale): Houndstongue is a biennial that <br />reproduces by seed. It is a difficult plant to control because the seed is easily <br />transported. Waterways provide ideal transport systems as the seeds will float and <br />attach to the bank for germination. <br />1. Control Measures <br />a) Cultural Control: Plant competition from various grasses can be a very <br />effective management tool. Revegetation with aggressive desirable <br />perennials in disturbed areas can assist in preventing an infestation. <br />b) Mechanical Control: Since the plant has a deep taproot, mechanical <br />control is difficult. Frequent mowing will prevent seed production and <br />reduce carbohydrate reserves. Cutting down the tall seed stalks reduces <br />seed dissemination. <br />