Reference

Response of lucerne cultivars to 2,4-DB and bromoxynil during establishment

Response of lucerne cultivars to 2,4-DB and bromoxynil during establishment. Schrodter, G. N.; Bowdler, T. M.; Lowe, K. F.; Rawson, J. E. (Dep. Primary Ind., Gatton 4343, Australia). Aust. Weeds, 3(3), 94-6 (English) 1984. CODEN: AUWEDT. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Lucerne cultivars Condura 73, Pioneer 581, Hunter River, Dekalb 185, Matador, and CUF 101 were sprayed with 2,4-DB [94-82-6] at 1.12, 1.68, and 2.24 kg/ha and with bromoxynil [1689-84-5] at 0.28, 0.42, and 0.56 kg/ha at the 3 trifoliate leaf stage. No significant interactions occurred between cultivars and herbicides in lucerne dry matter prodn. by the mean yields from the 3 rates of 2,4-DB were lower than the untreated controls in CUF 101 and Matador 7 wk after spraying. Dry matter yields of all cultivars were depressed at this stage by bromoxynil. All differences had disappeared by 14 wk after spraying. Dry matter yield of weeds and d. of common sowthistle (Sonchus oleraceus) were reduced below that of the control treatment by all herbicide treatments; dry matter yield of burr medic (Medicago polymorpha) was reduced below that of the control by all herbicide treatments except 1.12 kg/ha 2,4-DB 7 wk after spraying.

Control of annual morningglories (Ipomoea spp

Control of annual morningglories (Ipomoea spp.) in soybeans (Glycine max). Barker, Michele A.; Thompson, Lafayette, Jr.; Godley, F. Michael (Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27650, USA). Weed Sci., 32(6), 813-18 (English) 1984. CODEN: WEESA6. ISSN: 0043-1745. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Field studies were conducted in North Carolina in 1981 and 1982 to evaluate the efficacy of postemergence over-the-top and postemergence-directed herbicides for control of five morningglory species: entireleaf (I. hederacea integriuscula), tall (I. purpurea), ivyleaf (I. hederacea hederacea), pitted (I. lacunosa), and scarlet (I. coccinea). The glabrous morningglories (scarlet and pitted) were more easily controlled than the pubescent morningglories (ivyleaf, tall, and entireleaf). Lower soybean injury, higher morningglory control, and greater soybean seed yields were obtained with over-the-top herbicide applications at 4 wk after planting (WAP) than at 6 WAP. Pitted morningglory was tolerant to low rates of 2,4-DB [94-82-6]. This herbicide applied over the top at the R1 stage of soybean growth produced low yields, probably as a result of morningglory interference and herbicide injury to the soybeans. Postemergence-directed applications of linuron [330-55-2] and metribuzin [21087-64-9] alone or in tank mixts. with 2,4-DB resulted in soybean injury that ranged from 12 to 36%. Highest soybean seed yields (equiv. to weed-free control) from postemergence-directed herbicides were obtained with applications of 2,4-DB, linuron, and metribuzin-2,4-DB mixt. [65804-31-1].