A simple method to assess wheat yield loss by Italian ryegrass (Lolium multiflorum Lam.) in the fields

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  • Suzuki Tomoko
    Faculty of Agriculture, Shizuoka University
  • Adachi Yusuke
    Faculty of Agriculture, Shizuoka University
  • Ichihara Minoru
    Faculty of Agriculture, Shizuoka University United Graduate School of Agricultural Science, Gifu University Shizuoka Prefectural Research Institute of Agriculture and Forestry
  • Yamashita Masayuki
    Faculty of Agriculture, Shizuoka University
  • Sawada Hitoshi
    Faculty of Agriculture, Shizuoka University
  • Inagaki Hidehiro
    Shizuoka Prefectural Research Institute of Agriculture and Forestry
  • Ishida Yoshiki
    Shizuoka Prefectural Research Institute of Agriculture and Forestry
  • Kida Yoichi
    Shizuoka Prefectural Research Institute of Agriculture and Forestry
  • Asai Motoaki
    National Agricultural Research Center

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Other Title
  • コムギ圃場におけるネズミムギによるコムギ減収率の簡易査定法
  • コムギ ホジョウ ニ オケル ネズミムギ ニ ヨル コムギ ゲンシュウリツ ノ カンイ サテイホウ

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A field assessment method to visually evaluate the wheat yield loss by Italian ryegrass (Lolium multiflorum Lam.) was developed. This survey was conducted in soybean-wheat rotational fields during 2004 to 2007 at Toyozumi, Fukuroi city, Shizuoka Prefecture, Japan. In June of each year, Italian ryegrass infestation levels for each field were visually rated according to six grades, and wheat and weed yield were quantified. Visual grading of ryegrass infestation was a reliable predictor of the relative wheat yield loss and weed abundance (plant density and dry matter). Ryegrass density and dry matter correlated with wheat yield loss;the relationship was described with a quadratic hyperbolic regression curve. Wheat yield loss up to 20% was regressed at weed densities of 8 to 12 plants m-2. Our results suggest that visual estimation of weed infestation is easy and effective for regional assessment of weed monitoring, crop loss and economic damage.

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