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
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.