Effect of Entomofungal Pathogens on Sugarcane Woolly Aphid (Ceratovacuna lanigera Zehntner) and its Predators


Abstract

Four isolates in each of B. bassiana, M. anisopliae and V. lecanii were tested for their pathogenicity to the sugarcane woolly aphid (SWA), Ceratovacuna lanigera Zehntner in oil emulsion formulations under field conditions at Arabhavi, Karnataka. Mycosis was observed with six isolates viz., B. bassiana, Bb4 (10%). Bb5a (19.8%), Bb6 (8.3%) and M. anisopliae. Ma2 (4.7%), Ma3 (16.2%.) and Ma4 (42.3%). Pathogenicity was confirmed by re-isolation of respective fungal isolates from the mycosed aphids. None of the V. lecanii isolates showed mycosis on C. lanigera. I n the laboratory bioassay studies. M. anisopliae (Ma4) and B. bassiana (BbSa) were found pathogenic to the predator of sugarcane woolly aphid, Dipha aphidivora causing 29.3 and 10.4 per cent mycosis. M. anisopliae (Ma 4) isolate was also found pathogenic to another predator of SWA, Micromus sp. causing 29.14 per cent mycosis.

Keywords

Beauveria Bassiana, Ceratovacuna Lunigcra, Dipha Aphidivora, Metarhizium anisopliae, Oil in Water Emulsion, Verticillium lecanii

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