, Volume 135, Issue 3, pp 163–170

Effects of temperature and solar radiation interactions on the survival of quiescent conidia of the entomopathogenic hyphomycetePaecilomyces fumosoroseus (Wize) Brown and Smith


    • Unité de Recherches en Lutte BiologiqueI.N.R.A.
  • Jacques Fargues
    • Unité de Recherches en Lutte BiologiqueI.N.R.A.
  • Marc Rougier
    • Unité de Recherches en Lutte BiologiqueI.N.R.A.
  • Robert Goujet
    • Unité de BioclimatologieI.N.R.A.
  • Bernard Itier
    • Unité de BioclimatologieI.N.R.A.
Entomopathogenic Fungi

DOI: 10.1007/BF00632338

Cite this article as:
Smits, N., Fargues, J., Rougier, M. et al. Mycopathologia (1996) 135: 163. doi:10.1007/BF00632338


The detrimental effect of solar radiation on the survival of conidia of the entomopathogenic fungusPaecilomyces fumoroseus was studied by monitoring germinability and ability to form colonies (CFU) of conidia irradiated at two temperatures, 25 and 35 °C, harmless to shaded conidia. There was no apparent effect when spores were exposed to a high level of artificial radiation (0.66 W m−2 UVB). However, at a lower level of irradiance (0.33 W m−2), effects of radiation occurred more quickly at 35 °C than at 25 °C. Under natural solar radiation, the rate of decrease in germinability or viability was doubled at 35 °C as compared to 25 °C, indicating an interaction between temperature and radiation effects under natural conditions. This interaction was not detected in indoor experiments, indicating that the spectral distribution of UV radiation has to be taken in account as well as its irradiance when studying its effects.

Key words

Entomopathogenic hyphomycetePaecilomyces fumosoroseusinoculum persistencesolar radiationtemperature



Colony Forming Units


Universal Time Coordinates


Ultra Violet B radiation (280–320 nm)

Copyright information

© Kluwer Academic Publishers 1996