ヤノネカイガラムシ雌成虫における卵巣の発育と幼虫発生との関係,とくにその予察への応用

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  • Relationship between the Ovarial Development and the Appearance of Nymphs in Arrowhead Scale, with Special Reference to its Application to Forecasting
  • ヤノネカイガラムシ メス セイチュウ ニ オケル ランソウ ノ ハツイク ト ヨウチュウ ハッセイ ト ノ カンケイ , トクニ ソノ ヨサツ エ ノ オウヨウ

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The leaves on which the arrowhead scale, Unaspis yanonensis Kuwana, feeds were collected throughout a period from February 1964 to January 1965 at an interval of 4 or 5 days, and all of the female adults were examined on the following points; (1) the degree of maturation of the ovaries, (2) whether the oviposition has been finished or not, (3) number of the eggs in ovaries of the matured females, and (4) number of the first instar nymphs found under the scale. Seasonal fluctuation of the first nymphs under natural condition were also investigated in order to check the results obtained from those experiments. The close relationship was found between the pattern of the appearance of the first instar nymphs under natural conditions and the percentage curve of the female adults having matured ovaries, as well as the percentage curve of the females which were ovipositing and oviposited. It was clearly recognized that the ovaries of females showed the regular changes before the appearance of the first instar nymphs. The number of the eggs contained in ovaries fluctuated in parallel with that of the first instar nymphs which were found later under the scales. The seasonal fluctuation in number of the nymphs observed under the scales was parallel with that of the population of the first instar nymphs under natural condition. It was ascertained that fluctuation curve of the first instar nymphs in the first and second generation can be estimated from the number of nymphs under the scales. The time of the first instar nymph appearance may be estimated about 2 months ahead in the first generation and 1 month earlier in the second generation by observing the time of blastoderm formation and yolk formation respectively.

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