Some like it hot, some not: influence of extreme temperatures on Lariophagus distinguendus and Anisopteromalus calandrae
Article first published online: 17 APR 2012
© 2012 Blackwell Verlag, GmbH
Journal of Applied Entomology
Volume 137, Issue 1-2, pages 146–152, February 2013
How to Cite
Niedermayer, S., Obermaier, E. and Steidle, J. L. M. (2013), Some like it hot, some not: influence of extreme temperatures on Lariophagus distinguendus and Anisopteromalus calandrae. Journal of Applied Entomology, 137: 146–152. doi: 10.1111/j.1439-0418.2012.01726.x
- Issue published online: 10 JAN 2013
- Article first published online: 17 APR 2012
- Received: January 13, 2012; accepted: March 20, 2012.
- biological control;
- empty space treatment;
- Sitophilus granarius ;
- stored product pests;
- stored products protection
The parasitic wasp species Lariophagus distinguendus (Förster) (Hymenoptera: Pteromalidae) and Anisopteromalus calandrae (Howard) (Pteromalidae) are used for inoculation biological control of the granary weevil Sitophilus granarius (L.) (Coleoptera: Curculionidae) in grain stores in Europe. To assess their suitability for biological control under extreme temperatures in winter and summer, we studied the influence of temperatures on their parasitization behaviour under natural fluctuating temperature conditions in the field and under constant temperature conditions in the laboratory. At low temperatures (≤20°C), L. distinguendus showed a higher parasitization rate than A. calandrae. At high temperatures (≥25°C), A. calandrae performed better than L. distinguendus that was negatively affected already at temperatures above 30°C. These findings suggest a temperature-dependent release of either L. distinguendus or A. calandrae to allow a more efficient application of the wasps in biological control.