Estimation of the economic injury level in the rice leaf roller, Cnaphalocrocis medinalis Guenee (Lepidoptera:pyralidae). I. Relation between yield loss and injury of rice leaves at heading or in the grain filling period.

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  • コブノメイガの要防除水準　Ｉ　　出穂期および登熟期の被害葉率と収量の関係
  • コブノメイガの要防除水準 (1) : 出穂期および登熟期の被害葉率と収量の関係
  • コブノメイガ ノ ヨウボウジョ スイジュン 1 シュッスイキ オヨビ トウジュ
  • I. Relation between Yield Loss and Injury of Rice Leaves at Heading or in the Grain Filling Period
  • I. 出穂期および登熟期の被害葉率と収量の関係

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To define the injury caused by the rice leaf roller, larvae on the rice plant were collected and the relationship between yield loss and period and extent of damage was analysed. Yield loss was not observed when the damage occurred in the grain filling period, although 67% of the leaves were injured. Yield was reduced by the decrease in the percentage of ripened grains and 1, 000-kernel-weight when the damage occurred at heading time, even if the ratio of leaf injury was below 67%. Yield was reduced in proportion to the ratio of the damaged area of the two upper most leaves. The ratio of yield reduction (Y) increased in proportion to the square of the ratio of injured leaf (X) as represented by the regression equation Y=1.55+0.0067X2 (r=0.9925).

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