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

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Abstract

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.

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Abbreviations

CFU:

Colony Forming Units

UTC:

Universal Time Coordinates

UVB:

Ultra Violet B radiation (280–320 nm)

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Authors and Affiliations

  1. Unité de Recherches en Lutte Biologique, I.N.R.A., Campus international de Baillarguet, 34982, Montferrier-sur-Lez, France

    Nathalie Smits, Jacques Fargues & Marc Rougier

  2. Unité de Bioclimatologie, I.N.R.A., 78850, Thiverval-Grignon, France

    Robert Goujet & Bernard Itier

Authors
  1. Nathalie Smits
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  2. Jacques Fargues
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  3. Marc Rougier
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  4. Robert Goujet
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  5. Bernard Itier
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Correspondence to Nathalie Smits.

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Smits, N., Fargues, J., Rougier, M. et al. Effects of temperature and solar radiation interactions on the survival of quiescent conidia of the entomopathogenic hyphomycetePaecilomyces fumosoroseus (Wize) Brown and Smith. Mycopathologia 135, 163–170 (1996). https://doi.org/10.1007/BF00632338

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  • DOI: https://doi.org/10.1007/BF00632338

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