Kaiser D., Bacher S., Mène-Saffrané L., Grabenweger G.
Efficiency of natural substances to protect Beauveria bassiana conidia from UV radiation.
Pest Management Science, 2018, 1-8.
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Résumé:
BACKGROUND: Solar radiation is assumed to be a major factor limiting the efficacy of entomopathogenic fungi used as biocontrol
agents in open field applications. We evaluated 12 natural UV-protective co-formulants for their effect on the survival
of UV-exposed Beauveria bassiana spores on agar plates, colza leaf discs and in the field.
RESULTS: Colony-forming unit (CFU) counts of unformulated conidia on agar plates and leaf discs dropped to ≤ 50% after
exposure to UV radiation. The highest UV protection was achieved with humic acid, which provided > 90% protection
of UV-B-exposed conidia in laboratory experiments. In the field, 10% humic acid increased spore persistence up to 87% at 7
days after application. Sesame and colza oil also provided high UV protection in both assays (> 73% and > 70%, respectively).
CONCLUSIONS: This study shows that it is possible to increase the persistence of B. bassiana spores under exposure to
UV radiation by formulation with natural UV-protective additives. UV protectants might, therefore, increase the efficacy of
entomopathogenic fungi as biocontrol agents in open field applications.
© 2018 The Authors. Pest Management Science published by JohnWiley & Sons Ltd on behalf of Society of Chemical Industry.
ISSN Print 1526-498X
ISSN en ligne: 1526-4998
Digital Object Identifier (DOI): https://doi.org/10.1002/ps.5209
ID publication (Code web): 40415
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