Itchgrass (±ottboellia cochinchinensis) control with nicosulfuron in no-till corn
1999
Rungsit Suwanketnikom | Sodsai Changsaluk (Kasetsart Uni., Bangkok (Thailand). National Corn and Sorghum Research Center)
Corn varieties tolerant to nicosulfuron at 40 g ai/ha are DK 888, Pioneer, Tevada 77, DK 818, KSX 3601, KSX 3504, Big 717, Pacific 300, Pacific 700, Uniseed, Pioneer 3012, and Royal. The appropriate time for application of nicosulfuron to get maximum control of itchgrass and minimum phytotoxicity to corn was at 3 weeks after corn germination. Nicosulfuron provided the same degree of inchgrass control under tillage and no-tillage system. Split application of nicosulfuron at 3 and 6 week after corn germination gave good control of itchgrass and reduced 95 percent and 80 percent of number of itchgrass in tillage and no-tillage system respectively. Split application of nicosulfuron caused slightly phytotoxicity to corn but no yield reduction was observed. While the preemergence application of pendimethalin and followed by the postemergence application of nicosulfuron caused high injury to corn and the yield was reduced. The combination of 2,4-D, triclopyr and fluroxypy with nicosulfuron improved the control of purple nutsedge (Cyperus rotundus), tropical spiderwort (Commelina benghalensis) and wild poinsettia (Euphorbia heterophylla). But they caused severe injury to corn and the yield was reduced. Adjuvants, Latron CS-7, APSA 80 and Sylgard 309 increased the activity of nicosulfuron for itchgrass control but caused severe phytotoxicity to corn and reduce the height and the yield of corn. The spray volume at 62.5 and 250 I/ha increased the activity of nicosulfuron for itchgrass control more than at 500 I/ha.
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