Abstract：
AIMS: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 . CONCLUSIONS: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.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Gutierrez AC,Machado JA,Hubner-Campos R,Pennisi MA,Rodrigues J,López Lástra CC,García JJ,Fernandes ÉK,Luz Cdoi
10.1111/jam.13254subject
Has Abstractpub_date
2016-11-01 00:00:00pages
1373-1383issue
5eissn
1364-5072issn
1365-2672journal_volume
121pub_type
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journal_title：Journal of applied microbiology
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