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Abstract
Information is presented on the occurrence, development, and feeding of
Scymnus (
Neopullus)
ningshanensis Yu et Yao. Information on its biology was collected in the field and laboratory in China and in quarantine in the United States. This lady beetle was found in China only on hemlock infested with
Adelges tsugae Annand and did not occur on nearby pine infested with another adelgid. In the laboratory, newly hatched larvae survived only if they could feed on hemlock woolly adelgid eggs. Development of the immature stages was about 10% faster than
S. (
N.)
sinuanodulus that occurs farther south in China. The climate in the native habitat of
S. ningshanensis is similar to the climate of Connecticut in respect to temperature, but rainfall is lower in the winter and higher in the summer than in Connecticut. Eggs are laid in the spring for several weeks, both in the laboratory and field. Feeding on hemlock woolly adelgid eggs stimulates egg production. The species is univoltine and without a true diapause, although adults are inactive at temperatures below 7°C.
Citation
Montgomery, Michael; Wang, Hongbin; Yao, Defu; Lu, Wenhau; Havill, Nathan; Li, Guangwu. 2002. Biology of
Scymnus ningshanensis (Coleoptera: Coccinellidae): A predator of
Adelges tsugae (Homoptera: Adelgidae). In: Onken, B.; Reardon, R.; Lashomb, J., eds. The hemlock woolly adelgid in the eastern United States symposium; 2002 February 5-7; East Brunswick, NJ. East Brunswick, NJ: New Jersey Agricultural Experiment Station and Rutgers University: 181-188.
