Field bioassay of Metarhizium anisopliae strains to control the poultry red mite Dermanyssus gallinae

The poultry red mite, Dermanyssus gallinae is one of the most economically deleterious ectoparasite of laying hens worldwide. To evaluate the efficacy of three strains (V245, 3247 and 715C) of entomopathogenic fungus Metarhizium anisopliae with potential as acaricides against D. gallinae, this inves...

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Published in:	Veterinary parasitology Vol. 178; no. 3; pp. 374 - 378
Main Authors:	Tavassoli, M., Allymehr, M., Pourseyed, S.H., Ownag, A., Bernousi, I., Mardani, K., Ghorbanzadegan, M., Shokrpoor, S.
Format:	Journal Article
Language:	English
Published:	Netherlands Elsevier B.V 10-06-2011
Subjects:	acaricides Animals bioassays Biological control cages cardboard Chickens conidia Dermanyssus gallinae ectoparasites entomopathogenic fungi farms Female Helianthus Iran laying hens Metarhizium - growth & development Metarhizium anisopliae Mite Infestations - prevention & control Mite Infestations - veterinary mites Pest Control, Biological - methods Poultry Diseases - parasitology Poultry Diseases - prevention & control Poultry red mite spraying sunflower oil traps Trombiculidae - microbiology Iran Poultry red mite Dermanyssus gallinae Metarhizium anisopliae Biological control
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Summary:	The poultry red mite, Dermanyssus gallinae is one of the most economically deleterious ectoparasite of laying hens worldwide. To evaluate the efficacy of three strains (V245, 3247 and 715C) of entomopathogenic fungus Metarhizium anisopliae with potential as acaricides against D. gallinae, this investigation was carried out in a commercial caged laying poultry farm in Naghedeh, West Azarbaijan of Iran. The parasite infestation already existed in the farm. Sunflower oil suspension of all fungal strains, each in two concentrations (1 × 10 7 and 1 × 10 9 conidia/ml) were used separately as spray on hens and cages, and in the control group the cages were only sprayed with sunflower oil and sterile distilled water. For estimating the population rate of mites before and after treatment, special cardboard traps were fixed to cages during a 1-month period. The traps were placed on weeks –1, 0, 1, 2 and 3 and always removed after 1 w. The results showed that the population rates post fungal treatment with the lower concentration were not significantly different compared to the control group. However, the reduction in mite numbers induced by all three strains at the concentration of 1 × 10 9 conidia/ml was significantly higher than the control ( P < 0.05). The results revealed that under field conditions, higher concentrations of M. anisopliae will be required for controlling D. gallinae.
Bibliography:	http://dx.doi.org/10.1016/j.vetpar.2011.01.031 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0304-4017 1873-2550
DOI:	10.1016/j.vetpar.2011.01.031