Pest Management Science (2008) 64, 1008-1014

Shao-Feng Jin, Ming-Guang Feng and Jue-Qi Chen (2008)
Selection of global Metarhizium isolates for the control of the rice pest Nilaparvata lugens (Homoptera: Delphacidae)
Pest Management Science 64 (10), 1008-1014
Abstract: BACKGROUND: This study was initiated to search for fungal candidates for microbial control of brown planthopper (BPH) Nilaparvata lugens Stål, to which little attention has been paid in the past two decades.
RESULTS: Thirty-five isolates of Metarhizium anisopliae (Metschnikoff) Sorokin and M. flavoviride Gams and Rozsypal from different host insects worldwide were bioassayed for their lethal effects against third-instar BPH nymphs at 25 °C and a 14:10 h light:dark photoperiod at ca 1000 conidia mm^-2. On day 9 post-treatment, mortality attributable to mycosis ranged from 6.5 to 64.2% and differed significantly among the tested isolates with no apparent relationship to their host origin. Only two BPH-derived M. anisopliae isolates from the Philippines (ARSEF456) and Indonesia (ARSEF576) killed > 50% of the nymphs. Both isolates were further bioassayed for time-concentration-mortality responses of the nymphs to the sprays of 19-29, 118-164 and 978-1088 conidia mm^-2 in repeated bioassays. The resultant data fitted a time-concentration-mortality model very well. Their LC₅₀ values were estimated as 731 and 1124 conidia mm^-2 on day 7 and fell to 284 and 306 conidia mm^-2, respectively, on day 10.
CONCLUSION: The two M. anisopliae isolates are potential biocontrol agents of BPH for further research. This is the first report of the lethal effects of global Metarhizium isolates on the rice pest.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Nilaparvata lugens		Indonesia
	Nilaparvata lugens		Philippines
Metarhizium anisopliae (entomopathogen)	Nilaparvata lugens		Indonesia
Metarhizium anisopliae (entomopathogen)	Nilaparvata lugens		Philippines