Oviposition response of the mosquito, Culex quinquefasciatus to the secondary metabolite(s) of the fungus, Trichoderma viride.
Secondary metabolites produced by Trichoderma viride, a deuteromycetes fungus, under submerged culture condition were formulated and evaluated for oviposition attractancy against gravid females of Culex quinquefasciatus mosquito. At a concentration of 10  g ml-1 the formulation showed remarkable attractancy with an oviposition active index (OAI) of +0.52. When the oviposition attractancy of the formulation was compared with a known oviposition attractant, p-cresol, both at 10  g ml-1, the former was found to be more attractive to result in 70% egg laying than the later with 30% egg laying. Thin layer chromatography fractions of the secondary metabolites showed that a fraction with Rf value of 0.88 was highly active as oviposition attractant with an OAI of +0.65. Further work on identification of the active principle(s) of the microbial formulation might lead to an oviposition attractant useful in mosquito vector management.
Geetha
I
I
Vector Control Research Centre, Indian Council of Medical Research, Pondicherry, India.
Paily
K P
KP
Padmanaban
V
V
Balaraman
K
K
D000818:Animals; D002855:Chromatography, Thin Layer; D003408:Cresols / Q000494:pharmacology*; D003465:Culex / Q000033:anatomy & histology / Q000187:drug effects*; D003470:Culture Media; D005260:Female; D010058:Oviposition / Q000187:drug effects*; D010572:Pest Control, Biological / Q000379:methods*; D014242:Trichoderma / Q000737:chemistry*
D003408:Cresols; D003470:Culture Media; C032538:4-cresol