Abstract
For the removal of Poaceae perennials (cogongrass and broomsedge) exuberant in the green tract at an electrical power substation with herbicide without affecting growth of Japanese lawngrases, a phytotoxicity test in a greenhouse and an herbicidal effect test in Wagner pots were conducted. The mixture of Asulam and trifloxysulfuron-sodium was confirmed to have an herbicidal effect on Poaceae perennials from the aerial part to the underground stem.
The experiment field was settled on a place where cogongrass grow in the green area (with Japanese lawngrases) of an substation land, and an Asulam and trifloxysulfuron-sodium mixture was sprayed. At the first spraying, the herbicide could not translocate thoroughly through the body of cogongrass; cogongrass geminated from the surviving underground stem and grew up. However, spraying the mixture twice a year almost suppressed the development of cogongrass.
The interaction mechanism between two herbicides which showed a high herbicidal effect in the combination used was inferred.
