BIOLOGY OF HARMONIA-AXYRIDIS (COLEOPTERA, COCCINELLIDAE) IN WINTER AGGREGATIONS

Citation
Ca. Nalepa et al., BIOLOGY OF HARMONIA-AXYRIDIS (COLEOPTERA, COCCINELLIDAE) IN WINTER AGGREGATIONS, Annals of the Entomological Society of America, 89(5), 1996, pp. 681-685
Citations number
22
Categorie Soggetti
Entomology
ISSN journal
00138746
Volume
89
Issue
5
Year of publication
1996
Pages
681 - 685
Database
ISI
SICI code
0013-8746(1996)89:5<681:BOH(CI>2.0.ZU;2-F
Abstract
Adults of the introduced coccinellid Harmonia axyridis (Pallas) were c ollected at aggregation sites in the autumn of 1993 and 1994 and descr ibed in terms of sex, size, and phenotype. Mating status and ovariole numbers of females and parasitism rates of both sexes were obtained by dissection. Females were larger than males, and beetles of both sexes from high elevations were larger and darker than their counterparts f rom lower elevations. In 1993, 11.8% of females had sperm in their spe rmathecae but 41.4% of females were mated in 1994. Adults were parasit ized by Strongygaster triangulifera (Loew) (Tachinidae) at rates of 14 .2 and 1.4% in 1993 and 1994, respectively.