Ritsuko Tsukuda

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The larvae ofPlutella xylostella were fed on five wild crucifers,Capsella bursa-pastoris, Lepidium virginicum, Cardamine flexuosa, Rorippa indica, R. islandica and a crop, cabbage. The developmental period of the immature stages, adult longevity, preoviposition period, fecundity and morphometrical characters of the adults were measured. The flight activity(More)
The wild crucifers,Rorippa indica andLepidium virginicum, are known to serve as host plants for the diamondback moth (DBM),Plutella xylostella, but they are less suitable than the preferred cultivated cruciferous plant, cabbage, in terms of adult body size and fecundity. The life history traits and flight activity of DBM adults grown on various host plants(More)
Guided by bioassay test results, we have isolated an active compound from the hexane layer of the extract of Andrographis paniculata and it was identified as 14-deoxyandrographolide. Although this compound has been known as a medicine in Pharmacology, its antifeedant activity against insects has never been reported yet. The minimum effective dose (MED =(More)
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