Julius-Kühn-Archiv (Mar 2012)
Thiencarbazone-methyl (TCM) and Cyprosulfamide (CSA) – a new herbicide and a new safener for use in corn
Abstract
Thiencarbazone-methyl is a new herbicide for the selective control of grasses and broadleaf weeds primarily in corn. The active ingredient belongs to the chemical class of sulfonly-amino-carbonyl-triazolinones (SACT) and acts as an inhibitor of the ALS-enzyme. The compound offers cross spectrum activity against grasses and broadleaf weeds and can be applied at the pre-emergence and the post-emergence timing. The use rate depends on the application timing and may vary from 22 – 45 g a.i./ha in pre-emergence applications and 10 – 15 g a.i./ha in post-emergence applications. Sequential treatments are possible as long as the maximum seasonal dose of 45 g a.i./ha is not exceeded. In commercial corn herbicides, TCM is always combined with safener technology such as the novel safener cyprosulfamide and with other herbicidal active ingredients. In pre-emergence applications, the primary herbicidal mixpartner is isoxaflutole. In herbicides designed for postemergence use, TCM is co-formulated with foramsulfuron, iodosulfuron or tembotrione. The commercial herbicides composed of TCM and CSA plus sulfonylurea or triketone partners have demonstrated high weed control success in conventional and herbicide-tolerant corn production systems. Depending on the product, the potential for one pass weed control has been confirmed. Control of perennial grasses like Sorghum halapense and Elymus repens together with control of problem weeds like Polygonum convolvulus and suppression of Cirsium arvense and Convolvulus arvensis appear to be among the most attractive features of TCM-based herbicides under European conditions. High crop tolerance of herbicides combining two or three highly active ingredients in one commercial product is ensured by the novel safener cyprosulfamide which can protect corn via root uptake and via leaf uptake from herbicide damage.
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