Impact of moisture on survival of Aedes aegypti eggs and ovicidal activity of Metarhizium anisopliae under laboratory conditions

The effect of relative humidity (43%, 75%, 86% and > 98%) on Aedes aegypti eggs treated with Metarhizium anisopliae or water only was tested for up to a six months exposure at 25ºC. Survival of larvae inside eggs was clearly affected by the lowest humidity (43%) tested, and eclosion diminished at...

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Published inMemórias do Instituto Oswaldo Cruz Vol. 103; no. 2; pp. 214 - 215
Main Authors Luz, C, Tai, M.H.H, Santos, A.H, Silva, H.H.G
Format Journal Article
LanguageEnglish
Published Brazil Fundação Oswaldo Cruz, Fiocruz 01.03.2008
Instituto Oswaldo Cruz, Ministério da Saúde
Fundação Oswaldo Cruz (FIOCRUZ)
Subjects
Aedes - microbiology
Animals
biological control
egg
entomopathogenic fungi
Humidity
Hypocreales - physiology
Insect Vectors - microbiology
Larva - microbiology
mosquito
Ovum - microbiology
PARASITOLOGY
Pest Control, Biological
Time Factors
TROPICAL MEDICINE
biological control
entomopathogenic fungi
egg
mosquito
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Summary:The effect of relative humidity (43%, 75%, 86% and > 98%) on Aedes aegypti eggs treated with Metarhizium anisopliae or water only was tested for up to a six months exposure at 25ºC. Survival of larvae inside eggs was clearly affected by the lowest humidity (43%) tested, and eclosion diminished at all humidities after increasing periods of exposure. M. anisopliae showed to have a strong ovicidal activity only at humidity close to saturation. No difference of activity was found between conidia and hyphal bodies tested. This fungus affected larvae inside eggs and has potential as a control agent of this important vector in breeding sites with high moisture.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1678-8060
0074-0276
0074-0276
1678-8060
DOI:10.1590/S0074-02762008000200016