ミナミアオカメムシの生殖組織の変化とその季節的消長の予察への応用

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  • The Change in Reproductive System of the Southern Green Stink Bug, <i>Nezara viridula</i>, and its Application to Forecasting of the Seasonal History
  • ミナミアオカメムシ ノ セイショク ソシキ ノ ヘンカ ト ソノ キセツテキ ショウチョウ ノ ヨサツ エ ノ オウヨウ エイブン

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A total of 1, 161 females of the southern green stink bug, Nezara viridula were dissected throughout its active season from April to December in 1962 at an interval of four or five days. Each individual was examined in regard to the following points; (1) degree of maturation of the ovaries discriminating five stages, (2) virgin or mated, (3) non-oviposited or oviposited, (4) appearance of black spots in the ovarioles as an indication of termination of oogenesis, (5) number of eggs contained in the ovaries of mature female and (6) amount of fat body. To check the results obtained from the dissection, censuses were conducted during the oviposition period of each generation to determine the egg laying process relative to time. Capture records of adults by a light trap were employed in interpretation of the seasonal history of the bug.<br>It was suggested that by regular dissections of females, it was possible to predict the process of oviposition knowing the intervals among percentage curves in regard to the mating, oviposition and black spotted, respectively. The number of generations in a year can be assessed by the dissection even when generations overlap, and the occurrence of an additional generation can be forecasted by dissecting its parents. The relation between the percentage curve of oviposited females and the accumulated percentage curve of the number of egg masses which were laid in the field was available for estimating the fecundity of the natural population. The number of eggs in the ovaries of the mature females corresponded well with the size of the egg masses observed actually in the field. The amount of the fat body considerably increased before and during hibernation. This seemed to be responsible for the hypertrophy of the cells. The differential maturity between the sexes in the hibernating population was suggested.<br>It was concluded that the changes in the reproductive system provide a useful means predicting the changes of seasonal history in the population of the southern green stink bug and application of this method is promising to other insect pests.

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