Theentomopathogenic fungus, Nomuraea rileyi (Farlow) Samson was isolatedfrom the cadavers
of Spodopteralitura (F.) collected from groundnut field of University of AgriculturalSciences,
Dharwad.rDNA-ITS sequence of N. rileyi isolate IOF1 showed considerable homologywith those of other isolates. Pathogenicity of N. rileyi isolate IOF1against S. litura was studied by topical application of spores at aconcentration of 108conidiaper litre to first to fifth instars. Early instars were highly susceptible witha mortality of 70.17 percent, which decreased significantly as the age of thelarvae advanced. Lethal time for 1st to 5th instars of S. litura was 130.71,137.77, 148.04, 235.65 and 263.10 hrs, respectively. In vitro compatibilityof N. rileyi with fungicides, insecticides and botanicals at theirrecommended dosages was studied. Among the fungicides, carbendazim and mancozebresulted in complete growth inhibition (100%), whereas tridemefon andcyperconazole inhibited the growth by 49.65% and 55.25%, respectively. Growthinhibition with insecticides endosulfan and dichlorvos was high (52.77% and50.68%, respectively). However, Methomyl and λ-Cyhalothrin resulted in low(11.81%) growth inhibition. Among the botanical extracts, both Annonasquamosa and Polyalthia longifolia showed higher growth inhibition(55.76%) when compared to those of Vinca rosea (2.40%) and Adhatodavasica (4.85%). Hence, the new isolate IOF1 of N. rileyi is aneffective entomopathogenic fungus that can be used against S. litura.
How to cite this article:
Patil, R.K.*, Bhagat, Y.S., Halappa, B. and Bhat, R.S. 2014. Evaluation of entomopathogenic fungus, Nomuraea rileyi (Farlow) samson for thecontrol of groundnut Spodoptera litura(F.) and its compatibility with synthetic and botanical pesticides. Journalof Biopesticides, 7, 106-115.
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