Abstract
Abstract In the last two decades, three previously common coccinellids (Adalia bipunctata (L.), Coccinella transversoguttata richardsoni Brown, and Coccinella novemnotata Herbst) have declined in abundance in South Dakota, while two invasive species (Coccinella septempunctata (L.) and Harmonia axyridis (Pallas)) have become established there. The objectives of this study were to survey coccinellids in various habitats in South Dakota to better characterize the current coccinellid fauna, determine the extent of exploitation by invasive coccinellids, and possibly identify refuge habitats of previously common coccinellid species. Overall, 2827 coccinellids, comprising 23 species, were collected on yellow sticky traps in field and woody habitats and during timed visual searches in field crops. Adalia bipunctata was found during additional sampling in Butte County in western South Dakota. However, it was not present in samples from eastern and central parts of the state, which is consistent with previous findi...
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