水稲のツマグロヨコバイ耐虫性　ＩＩ　　イネの生育時期による抗生作用の変動

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タイトル別名
  • Resistance of Rice Plant to the Green Rice Leafhopper, <i>Nephotettix cincticeps</i> UHLER
  • スイトウ ノ ツマグロヨコバイ タイチュウセイ ニカンスルケンキュウ 2 イネ
  • 2. 稲の生育時期による抗生作用の変動

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The antibiosis of the resistant rice varieties was evaluated using the leaf blade testing method (KISHINO and ANDO, 1978) from the seedling period to maturity. The intensity of the antibiosis fluctuated with the growing stages of the rice plant. The response of the resistant varieties which was strong at the young seedling stage, decreased at the 5th-6th leaf stage but increased thereafter, although its degree varied with the varieties. The strongest response was observed approximately 20 days before heading time. The antibiosis of the whole plant was also tested by caging the insects with the entire tiller. The fluctuation in the antibiosis was similar to that observed with the leaf blade test. It was pointed out that non-preference and decrease in fecundity of insects feeding on the resistant rice varieties also tended to fluctuate with the growing stages of the plant.

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