Skip to Main Content
Scymnus camptodromus (Coleoptera: Coccinellidae) larval development and predation of hemlock woolly adelgid (Hemiptera: Adelgidae)Author(s): Samita Limbu; Melody A. Keena; David Long; Nancy Ostiguy; Kelli Hoover
Source: Environmental Entomology. 44(1): 81-89.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
View PDF (264.67 KB)
DescriptionDevelopment time and prey consumption of Scymnus (Neopullus) camptodromus Yu and Liu (Coleoptera: Coccinellidae) larvae by instar, strain, and temperature were evaluated. S. camptodromus, a specialist predator of hemlock woolly adelgid Adelges tsugae (Annand) (Hemiptera: Adelgidae), was brought to the United States from China as a potential biological control agent for A. tsugae. This beetle has been approved for removal from quarantine but has not yet been field released. We observed that temperature had significant effects on the predator's life history. The larvae tended to develop faster and consume more eggs of A. tsugae per day as rearing temperature increased. Mean egg consumption per day of A. tsugae was less at 15°C than at 20°C. However, as larvae took longer to develop at the lower temperature, the total number of eggs consumed per instar during larval development did not differ significantly between the two temperatures. The lower temperature threshold for predator larval development was estimated to be 5°C, which closely matches the developmental threshold of A. tsugae progrediens. Accumulated degree-days for 50% of the predator neonates to reach adulthood was estimated to be 424. Although temperature had a significant effect on larval development and predation, it did not impact survival, size, or sex ratio of the predator at 15 and 20°C. Furthermore, no remarkable distinctions were observed among different geographical populations of the predator.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLimbu, Samita; Keena, Melody A.; Long, David; Ostiguy, Nancy; Hoover, Kelli. 2015. Scymnus camptodromus (Coleoptera: Coccinellidae) larval development and predation of hemlock woolly adelgid (Hemiptera: Adelgidae). Environmental Entomology. 44(1): 81-89.
KeywordsScymnus camptodromus, Adelges tsugae, development time, prey consumption, degree-day
- Host range specificity of Scymnus camptodromus (Coleoptera: Coccinellidae), a predator of hemlock woolly adelgid (Hemiptera: Adelgidae)
- Low temperature in the hemlock woolly adelgid system
- Impacts of hemlock decline and ecological considerations for hemlock stand restoration following hemlock woolly adelgid outbreaks
XML: View XML