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Life History and Development of Scymnus frontalis (Fabricius) (Coleoptera: Coccinellidae) on Four Species of Aphid
Roberta L. Gibson, Norman C. Elliott and Paul Schaefer
Journal of the Kansas Entomological Society
Vol. 65, No. 4 (Oct., 1992), pp. 410-415
Published by: Kansas (Central States) Entomological Society
Stable URL: http://www.jstor.org/stable/25085390
Page Count: 6
You can always find the topics here!Topics: Insect larvae, Peas, Grains, Species, Beetles, Fecundity, Larval development, Eggs, Adult insects, Immatures
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The ladybird beetle, Scymnus frontalis (Fabricius), was imported from Turkey as a potential predator of the Russian wheat aphid, Diuraphis noxia (Mordviklo). Larval developmental time and adult fecundity were examined for S. frontalis fed four aphid species: the Russian wheat aphid; the greenbug, Schizaphis graminum (Rondani); the English grain aphid, Macrosiphum avenae (L.); and the pea aphid, Acyrthosiphon pisum (Harris). Larvae reared on Russian wheat aphids completed development 0.7 to 1.4 days sooner and weighed 0.5 to 0.3 mg less than those reared on English grain aphids or pea aphids, respectively. No differences were found in adult survival or fecundity for adults reared on Russian wheat aphids, greenbugs, or pea aphids. The intrinsic rate of increase (0.73) was significantly greater for S. frontalis fed Russian wheat aphids compared with those fed pea aphids or greenbugs (0.60 and 0.63, respectively). In a prey preference test, S. frontalis larvae ate 323/600 first- or second-instar Russian wheat aphids and 274/600 English grain aphids indicating a slight preference for Russian wheat aphids as prey.
Journal of the Kansas Entomological Society © 1992 Kansas (Central States) Entomological Society