トビイロウンカとヒメトビウンカのはね型決定に及ぼす密度効果

概要

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The brown planthopper, Nilaparvata lugens STAL and the smaller brown planthopper Laodelphax striatellus FALLEN were reared on the rice seedling in grass tubes under the conditions of constant temperature of 27.5℃ and day lenght of 16 hr illnmination per day. In N. lugens, the percentage of the number of the brachypterous females was increased by reducing the density of hoppers per rice seedling whenever the density of hoppers per tube was high. While, in L. striatellus the appearance of the brachypterous female was induced under the rearing condition of the low hopper density per food plant or per tube. In N. lugens the appearance of brachypterous male ws induced by the high hopper density when the quantity of food was sufficient for the hopper. In L. striatellus, brachypterous male appeared very few through the present experiment. In both species, the feeding on the feeble rice seedling scarcely caused the appearance of brachypterous male and female even under the isolated rearing. The visual stimulation effect among hoppers for the determination of the wing-forms of L. striatellus was not clear in this experiment. It was statistically examined that the first instar hoppers of both species had a habit of aggregation.
日本応用動物昆虫学会の論文
1967-06-25