コナガの翅長および産卵能力の季節的変化とその解析

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The damage to crucifers inflicted by the diamond-back moth, plutella xylostella (L.) varies both in season and locality in Japan. In Kanagawa Prefecture, a conspicuous tendency was recognized i.e., the damage in summer is moderate whereas it becomes serious to a large extent in winter. This work was conducted as a part of studies which were carried out to clarify the reason why the above mentioned phenomenon is caused, and the following facts were determined : (1) As a result of a succesive four year observation the monthly number of adult moth, caught in light traps, reached its peak in May and June and fell in August. Furthermore, there was a marked tendency for the forewings of adult moths to be minimal in length for both sexes, in August but the length appeared increased before and after this month. (2) Pupae were collected seasonally from grown cabbage leaves and the adult moths that emerged were kept as 25C°under 12- and 16-hr. photoperiods, respectively, to investigate longevity and fecundity. The summer female moths (emerged from pupae collected in August) were short-lived and laid less eggs, whereas the winter moths (emerged from pupae collected in December and January) were long-lived and laid more eggs. Both spring moths and autumn moths had an intermediate character. It was concluded that the fecundity of adult moths was not merely associated with longevity, but was determined by pupal sige and this was affected by the temperature during immature stages. It was also observed that the difference in daylength in the adult stage had no influence on the above mentioned characteristics of the adult.
日本応用動物昆虫学会の論文
1972-12-25

コナガの翅長および産卵能力の季節的変化とその解析

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