Herbicide Amaranthus retroflexus

Rola, H. and J. Rola (1996). Occurrence of Amaranthus retroflexus, Chenopodium album and Echinochloa crus-galli in southwest Poland and their control by herbicides. In R. DePrado, J. Jorrin, L. Garcia Torres, and G. Marshall, eds., Proceedings of the international Symposium on Weed and Crop Resistance to Herbicides. Cordoba, Spain Graficas TYPO, S.L, pp. 42-44. 

McNaughton, K.E., J. Letarte, E.A. Lee, and E.J. Tardif (2005). Mutations in ALS confer herbicide resistance in redroot pigweed (Amaranthus retroflexus) and Powell amaranth (Amaranthus powellii). Weed Sci., 53 17-22. 

Sibony, M., A. Michel, H.U. Haas, B. Rubin, and K. Hurle (2001). Sulfometuron-resistant Amaranthus retroflexus Cross-resistance and molecular basis for resistance to acetolactate synthase-inhibiting herbicides. Weed Res., 41 509-522. 

Some of the problem dicotyledonous weeds, such as common lambsquarters (Chenopodium album), pigweed (Amaranthus retroflexus) and Russian thistle (Salsola kali), are resistant to asulam. On the other hand, as a postemergence herbicide asulam is effective against Rumex spp., Averui fatua and Pteridium aquilinum. 

Pyridate is a contact selective herbicide with foliar activity. It is effective for the control of annual broad-leaved weeds and some grassy weeds on cereals, maize, rice and some other crops at a rate of 1.0-1.5 kg active ingredient/ha. It has the advantage of killing efficiently some triazine-resistant weeds, such as Galium aparine and Amaranthus retroflexus in their early development (Discus et al., 1976). 

For the purpose of determining the influence of environmental factors and rainfall, herbicidal activity of 30 % BTWS EC, was determined at different times of treatment under a simulant rainy condition. 41 % MCPA EC was included as a positive control. Common amaranth Amaranthus retroflexus) was used as the tested plant. 

---