| Autor: |
Coseglia, Alfred F., Simpson, Robert G., Eklund, Leslie R. |
| Zdroj: |
Annals of the Entomological Society of America; September 1977, Vol. 70 Issue: 5 p695-695, 1p |
| Abstrakt: |
Mesochorus nigripes Ratzeburg is an indirect solitary hyperparasite of Bathyplectes stenostigma (Thomson) and B. curculionis (Thomson). Females lay single eggs in larvae of these parasites which are within larvae of the alfalfa weevil. The egg is hymenopteriform and continually enlarges from oviposition to eclosion. The 1st stage larvae eclose in 43–100 h. Once this stage reaches maximum size, the larva becomes quiescent and overwinters. The larva molts to the 2nd instar with the onset of warm spring weather. Both 2nd and 3rd stages require ca. 3 days for completion. The 4th stage larva matures in 4–5 days. Pupation requires 7–8 days for completion. Females emerge in 16–21 days at 26.7°C. Males were not found in field collections or in laboratory rearings. The initial hyperparasitism of the larval parasites ranged as high as 30% in newly-infested fields, but dropped and has remained relatively constant at 10% in older infestations. This reduction may be a natural phenomenon caused by environmental pressure or it may be due to a normal cyclical fluctuation in the population. The spread of this hyperparasite to other nearby states appears inevitable. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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