Journal of Applied Microbiology (2016) 121, 1373-1383

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A.C. Gutierrez, J.A.R. Machado, R. Hubner-Campos, M.A. Pennisi, J. Rodrigues, C.C. López Lástra, J.J. García, É.K.K. Fernandes and C. Luz (2016)
New insights into the infection of the American cockroach Periplaneta americana nymphs with Metarhizium anisopliae s.l. (Ascomycota: Hypocreales)
Journal of Applied Microbiology 121 (5), 1373-1383
To study the marked resistance of Periplaneta americana to entomopathogenic Metarhizium anisopliae.
Methods and Results
The low susceptibility of 4th instar nymphs applied topically with conidia seemed to be related to an active removal of conidia by the cockroach and to a disabled or retarded germination and subsequent development of conidia on the cuticle (up to 80% germination in the next 7 days after application). Inhibitions or delays of germination were related to the composition of the epicuticular fatty acids (30·1% w/w oleic, 28·3% w/w linoleic, 24·5% w/w palmitic and 11·7% w/w stearic acid) reported here. Propagules invading the nymphs through the cuticle took at least 3 days to reach the haemocoel, and no propagules were found after day 8 post-treatment. Strain IP 46 infected >50% of nymphs treated with doses >2 × 104 hyphal bodies (HB) nymph-1 and reduced the survival of nymphs < 50%. Most nymphs (>70%) survived after injection of 6 × 103 and 2 × 103 HB nymph-1.
Findings emphasize a distinct resistance of nymphs of the American cockroach to infections by M. anisopliae.
Significance and Impact of the Study
Our findings provide support for the development of biological control of this synanthropic cockroach 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
Database assignments for author(s): Christian Luz

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Periplaneta americana
Metarhizium anisopliae (entomopathogen) Periplaneta americana