Generations and reproduction in the predacious miteAmblyseius swirskii Ath.-Hen. (Acari, Phytoseiidae) fed with artificial and natural diets

  • A. Abou-Awad
  • S. A. Elsawi
Article

Abstract

The predatory mite,Amblyseius swirskii Athias-Henriot successfully went through 5 generations on a diet consisting of pollen grains ofRicinus communis (L.) and a mixture compositing of yeast, milk, cystine, proline, arginine, sucrose, and glucose in the ratio 1∶2 respectively. It was able to return to their natural prey,Tetranychus urticae Koch, in the six generation, apparently unaffected by the artificial-pollen diet. The average reproduction as well as percentage attaining maturity were normal through successive generations indicating no deficiencies in the predator mite biology. Females on both tetranychid prey and pollen diet gave rise to the ratio approximating 2.2 females to 1 male; this ratio was changed to an average 1.7 females and 1 male in females fed on artificial-pollen diet.

Keywords

Glucose Sucrose Plant Physiology Prolin Plant Pathology 

Zusammenfassung

Die Raubmilbe,Amblyseius swirskii, durchlief erfolgreich 5 Generationen bei Fütterung mit einer Diät, die aus einem Gemisch vonRicinus communis-Pollen (1 Teil) sowie Hefe, Milch, Cystin, Prolin, Arginin, Sucrose und Glukose (2 Teile) bestand. Die Population war imstande, danach (in der 6. Generation) zu ihrer Naturnahrung, der SpinnmilbeTetranychus urticae, zurückzukehren, ohne daß die mittlere Reproduktion und die Maturitätsquote sich veränderten. Das Geschlechterverhältnis war bei Tieren, die mit reinem Pollen ernährt wurden, das gleiche wie bei Ernährung mit Naturbeute (2,2 Weibchen:1 Männchen), während es bei Fütterung mit Pollen-Diätgemisch sich zugunsten der Männchen verschob (1,7 Weibchen:1 Männchen).

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References

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Copyright information

© Verlag Paul Parey 1992

Authors and Affiliations

  • A. Abou-Awad
    • 1
  • S. A. Elsawi
    • 1
  1. 1.Plant Protection DepartmentNational Research CentreCairoEgypt

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