Trifloxysulfuron-sodium: a new post-emergence herbicide for use in Australian cotton and sugarcane

摘要

Trifloxysulfuron-sodium (formerly CGA 362622), a new sulfonylurea herbicide, has been under evaluation in Australia since 1997 for use in cotton and as a readymix with ametryn in sugarcane. Key attributes of trifloxysulfuron-sodium include: 1) excellent activity on many of the 'most troublesome weeds' in these crops, 2) flexibility of use in both sugarcane and cotton, 3) ultra-low use rate, 4) short but effective residual activity, and 5) an excellent environmental and safety profile. Applied post-emergence it is effective against troublesome broadleaf weeds such as Xanthium spp. (Noogoora burr, Bathurst burr), Ipomoea spp. (peachvine, bellvine), sesbania pea (Sesbania cannabina (Retz.) Poir.) and nutgrass (Cyperus rotundus L.) at very low use ratesranging from 11.25 to 22.5 g a.i. ha~(-1). A number of other weeds were also controlled or suppressed. Trifloxysulfuron-sodium is a versatile tool for both sugarcane and cotton growers in combating weeds by offering the flexibility of 'over the top' application. It has a wide window of application allowing treatment of cotton up until row closure and in plant cane and ratoon cane from two leaves until the 'out of hand' stage. Such flexibility is not found amongst the current commercial standards.