Biocontrol Science and Technology (1998) 8, 357-364

P.A. Shah, O.-K. Douro-Kpindou, A. Sidibe, C.O. Daffe, H. van der Pauuw and C.J. Lomer (1998)
Effects of the sunscreen oxybenzone on field efficacy and persistence of Metarhizium flavoviride conidia against Kraussella amabile
Biocontrol Science and Technology 8 (3), 357-364
Abstract: A field trial was performed at Mourdiah, north-west Mali, to evaluate whether the performance of Metarhizium flavoviride conidia would improve by using 2% oxybenzone, an oil-soluble ultraviolet light protectant. Conidia were applied in an ultra-low volume formulation against nymphs of the grasshopper Kraussella amabile. Mortality was assessed by collecting grasshoppers directly from field plots (sweep net samples) or by exposing untreated nymphs to sprayed vegetation for 48 hours (cage samples). For sweep net samples, mortalities in M. flavoviride treatments varied between 94.5-99.9% up to seven days after treatment, while control mortalities were significantly lower (20.7-55.0%). There were no significant differences between M. flavoviride treatments with or without oxybenzone. Average survival times were found to be significantly lower for fungal treatments (4.9 days) compared to the control treatment (11.8 days). With field cage samples, mortality in M. flavoviride treatments declined from >95.0% for nymphs exposed just after application to <30.0% for nymphs exposed to treated vegetation on the tenth day after application. Control mortalities varied between 5.1-37.2% and were significantly lower than fungal treatments for samples placed just after application and ten days after application. Overall average survival times were 10.9 and 10.7 days for M. flavoviride with and without oxybenzone respectively and 13.9 days with the control treatment. An exponential regression was fitted using cage mortality data which indicated the half-life for conidial infectivity was 4.3 days on treated vegetation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Ouro Kobi Douro-Kpindou, Chris J. Lomer

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
formulation/storage of bioagents

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Kraussella amabile		Mali
Metarhizium acridum (entomopathogen)	Kraussella amabile		Mali