An Integrated Weed Control Method for Herbicide-resistant Water Foxtail (Alopecurus aequalis) and Beckmann's Grass (Beckmannia syzigachne) in Wheat and Barley Fields Using the Partial Shallow Tilling and Sowing Technique

Abstract

Field experiments were conducted in 2009 to establish integrated weed control methods for prevention of herbicideresistant water foxtail (Alopecurus aequalis) and Beckmann's grass (Beckmannia syzigachne), which cause serious problems in the wheat and barley fields in northern Kyushu. Partial shallow tilling and sowing (PSTS) combined with glyphosate potassium salt treatment were effective for the control of water foxtail and Beckmann's grass. PSTS without glyphosate potassium salt treatment increased the number of survived water foxtail plants and Beckman's grass to 117～185% and 185%, respectively. It increased fresh weight to 202～321%, and dry weight of Beckmann's grass to 190% of that under the conventional method. Howeve, PSTS combined with glyphosate potassium salt treatment reduced the number of survived water foxtail plants to 25～53% and their fresh weight to 22～24%. It reduced the number of survived Beckmann's grass to 13% and dry weight to 5% of that under the conventional method.