Temperature-dependent development in an Oregon population of Harmonia axyridis (Coleoptera: Coccinellidae)
1998
Lamana, M.L. | Miller, J.C.
The multicolored Asian lady beetle, Harmonia axyridis (Pallas), and aphidophagous coccinellid, was first seen in Benton County, OR. in 1993. Coincident with the 1st occurrence of H. axyridis, we initiated a study on its temperature-dependent survival and development. Survival from 1st instar to adult emergence ranged from 83-90% between 18 and 30 degrees C, and at 10 and 34 degrees C was 42 and 25%, respectively. Mean time for complete development ranged from 14.8 d at 30 degrees C to 81.1 d at 14 degrees C. No eggs hatched at 10 degrees or 34 degrees C and no 1st instars transferred to 10 degrees C survived. The mean lower threshold for egg-to-adult development of 11.2 degrees C is typical relative to other temperate aphidophagous Coccinellidae and was not significantly different from 10.5 degrees C calculated for a French population of this beetle. Conversely, the mean number of degree-days (DD) required for complete development was higher in the Oregon population (267.3 DD) than the French population (231.3 DD), although this may have been due in part to a different diet. Times for preimaginal development and values for thermal requirements suggest that the species is a thermal generalist in western Oregon.
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