Occurrence of Sulfonylurea-resistant Biotypes of Scripus juncoides Roxb. var. ohwianus. T. Koyama in paddy fields of Hokkaido prefecture, Japan.

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  • Kohara Hiroshi
    Hokkaido Central Agricultural Experiment Station
  • Konno Kazuo
    Hokkaido Central Agricultural Experiment Station present address: Hokkaido Kitami Agricultural Experiment Station
  • Takekawa Masakazu
    Hokkaido Central Agricultural Experiment Station present address: Hokkaido Dounan Agricultural Experiment Station

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Other Title
  • 北海道におけるスルホニルウレア系除草剤抵抗性イヌホタルイ（Ｓｃｉｒｐｕｓ　ｊｕｎｃｏｉｄｅｓ　Ｒｏｘｂ．ｖａｒ．ｏｈｗｉａｎｕｓ　Ｔ．Ｋｏｙａｍａ）の出現
  • ホッカイドウ ニ オケル スルホニルウレアケイ ジョソウザイ テイコウセイ イヌホタルイ Scirpus juncoides Roxb. var. ohwianus. T. Koyama

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Abstract

Scripus juncoides Roxb. var. ohwianus. T. Koyama, a perennial sedge, was one of the most serious paddy weeds from 1960s to 1980s in Japan. The weed had been easily controlled by sulfonylurea herbicides in 1990s in Hokkaido prefecture, Japan. In 1997, however, S. juncoides survived in Iwamizawa, Nakafurano and Kuriyama town where the situation in paddy fields was characterized as follows; 1) The herbicides were properly used. 2) Other weeds were completely controlled by the herbicides. 3) Severe infestation of S. juncoides had occurred for more than two years. 4) S. juncoides had been completely controlled before. 5) Sulfonylurea herbicides were used for more than five years.<br>Two pot experiments were conducted to investigate the response to bensulfuron-methyl, pyrazosulfuron-ethyl and imazosulfuron (Figs. 1, 2 and Tables 4, 5).<br>The results indicated that sulfonylurea-resistant biotypes of S. juncoides had occurred. The sulfonylurea-resistant biotypes of S. juncoides showed a cross-resistance to the surfonylurea herbicides. 50% lethal dose (LD50) of the resistant biotypes was 40 to 140 times higher than that of the susceptible biotypes sampled from the experimental paddy fields in Hokkaido Central Agricultural Experiment Station (Table 4). Combination of herbicides including pretilachlor·benfuresate·pyrazolate·dimethametryn or including pyributicarb·bromobutide·benzofenap was effective in controlling the sulfonylurea-resistant biotypes of S. juncoides (Table 5). This suggested that if the occurrence of surfonylurea-resistant biotypes of S. juncoides is confirmed, effective herbicides should be used to control the sulfonylurea-resistant biotypes of S. juncoides.

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