Weed control in dwarf cogongrass (Imperata cylindrica (L.) Beauv. var. koenigii (Retz.) Durand et Schinz) fields by herbicides

• Published in: Journal of Weed Science and Technology Vol. 64; no. 4; pp. 140 - 146
• Main Authors: Yamashita, Miku, Tanaka, Maiko (Okazaki), Inoue, Takayasu, Kono, Akiko, Ohno, Naoki, Ogasawara, Masaru
• Format: Journal Article
• Language: Japanese; English
• Published: The Weed Science Society of Japan 2019
• Subjects: Dwarf cogongrass (Imperata cylindrica L.); post-emergence herbicide; pre-emergence herbicide; sequential application; weed control
• ISSN: 0372-798X; 1882-4757
• DOI: 10.3719/weed.64.140

To better understand which herbicides were best suited for controlling weeds in Dwarf cogongrass (Imperata cylindrica (L.) Beauv. ‘Hajime’) field, their safeties to Dwarf Cogongrass and herbicidal activities against a variety of weeds were investigated using pot and field test. The results of pot test in a greenhouse showed that of 18 herbicides tested, six could be used with Dwarf cogongrass; three were effective pre-emergence herbicides (S-metolachlor, pyroxasulfone, triaziflam) and three were effective post-emergence herbicides (harosulfuron-methyl, atrazine, triclopyr). The findings obtained from field test showed that the two sequential applications, S-metolachlor/harosulfuron-methyl and S-metolachlor/atrazine, are effective for control weeds without damaging Dwarf cogongrass when S-metolachlor was applied as a pre-emergence herbicide at a rate of 300 g a.i./10 a, followed by harosulfuron-methyl as a post-emergence herbicide at a rate of 100 g a.i./10 a and/or atrazine as a post-emergence herbicide at a rate of 300 g a.i./10 a.