Graduate Thesis Or Dissertation
 

The bionomics of the cabbage flea beetle, Phyllotreta cruciferae (Goeze), in western Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/n583xx71f

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  • The cabbage flea beetle, Phyllotreta cruciferae (Coleoptera: Chrysomelidae) was introduced into the United States from Europe during the 1920's and 1930's. It was described as a new species, P. columbiana, native to North America by F. H. Chittenden in 1927. This synonymic situation was discovered in 1953 after P. cruciferae had become established as an economically important pest of crucifers in northeastern and northwestern United States. The immature stages (egg, three larval stages, prepupal and pupal stage) are soil inhabitants. The adult is bluish black and two to three millimeters in length. P. cruciferae was found to be univoltine in western Oregon, with the adults of the annual generation apparently overwintering in a state of reproductive diapause. Grass sod appeared to be the favored overwintering site. Circumstances indicated that darkness was a factor influencing oviposition. Oviposition was not observed, but the probable oviposition period occurred from June to the middle of July. The preoviposition period was found to be about three and one half days. The females laid about 37 eggs per mating. Field sampling indicated a 1:1 ratio of males to females existed. The major attack, which causes the greatest economic loss, arises from the overwintered generation feeding on spring-planted crucifers. The larvae feed externally on the roots of crucifers. One natural enemy, tentatively identified as Microctonus vittatae Muesebeck (Hymenoptera:Braconidae) was found parasitizing ten percent of P. cruciferae in the field.
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file details MeisterHermanS1969.pdf 2017-08-14 Público Descargar