Population Growth, Longevity and Fecundity of <i>Rhopalosiphum maidis</i> FITCH (Homoptera: Aphididae), on Wheat and Barley Seedlings Grown under Different Nutritional Conditions

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  • 寄主の栄養条件とトウモロコシアブラムシの増殖
  • キシュ ノ エイヨウ ジョウケン ト トウモロコシアブラムシ ノ ゾウショク エイブン

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Population growth, survival rate and fecundity of apterous Rhopalosiphum maidis were examined on wheat and barley seedlings growing under different nutritional conditions. Barley plants grown under all the cultural conditions tested always gave more rapid population growth, higher survival rate and greater fecundity of the aphid than wheat plants. On wheats, the aphid increased its population more rapidly on seedlings cultured in low-nitrogen solution (termed as low-N wheat) than on seedlings grown in high nitrogen solution (high-N wheat) and in manured soil (soilplanted wheat). Survival rate and fecundity of the aphid were highest on the low-N wheat, lower on the high-N wheat and lowest on the soil-planted wheat. The suitability of barley and wheat seedlings grown under different nutritional conditions as a host plant are arranged as follows: soil-planted barley=high-N barley>low-N barley>low-N wheat>high-N wheat>soil-planted wheat.<br>The suitability of wheat seedlings as a host plant seems to correlate positively with sugar content and negatively with nitrogen content of the seedlings. The wheat seedlings may contain an antibiotic substance against Rhopalosiphum maidis, synthesis and/or acitivity of which reduced under such conditions as nitrogen deficiency.

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