Journal
BIOCONTROL
Volume 55, Issue 3, Pages 413-422Publisher
SPRINGER
DOI: 10.1007/s10526-009-9265-2
Keywords
Beauveria bassiana; Metarhizium anisopliae; UV damage; Dose-survival modeling; Fungal tolerance; Myzus persicae; Microbial control
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Funding
- Natural Science Foundation of China [30930018]
- Ministry of Science and Technology [2009CB118904, 2007DFA3100, 2006AA10A212, 2007AA021305]
- Zhejiang RD programs [2007C12035, 2008C12057, 2008C02007-1]
- National Research Foundation [41404]
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Conidia of Beauveria bassiana and Metarhizium spp. smeared on glass slides were assayed for their responses to irradiation with weighted 312-nm UV-B and 365-nm UV-A at gradient doses of 0.005-1.1 and 1.0-18.0 J cm(-2), respectively. All inverted, sigmoid dose-survival trends showed good fit to a survival model (r (2) a parts per thousand yen 0.97), yielding respective UV-B LD(50)s of 0.23-0.59 and 0.05-0.65 J cm(-2) for 24 B. bassiana and 36 Metarhizium isolates, and UV-A LD(50)s of 2.78-10.46 J cm(-2) for 24 Metarhizium isolates. Myzus persicae apterae on detached leaves were sprayed with a concentrated spore suspension of B. bassiana or M. anisopliae, followed by exposure to the UV-B doses to cause 10-90% viability losses. These doses caused aphid mortality reductions as expected but affected neither spray-to-death period nor fungal growth on cadavers. The results highlight the merits of using UV-tolerant candidates and photoprotection measures in fungal formulations for pest control.
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