Evaluation of fungal pathogen, Fusarium semitectum Berk and Ravenel against okra aphid, Aphis gossypii Glover under laboratory and green house conditions

G T JAYASIMHA, R R RACHANA, V B RAJKUMAR, M MANJUNATHA

Abstract


Efficacy of fungal pathogen, Fusarium semitectum Berk and Ravenel was evaluated against okra aphid, Aphis gossypii Glover under laboratory and greenhouse conditions at the Department of Entomology, College of Agriculture, Shimoga, India during 2007-08. The results showed that the highest mortality of 79.90 and 64.40 per cent nymphs and adults, respectively was recorded at 4.60 x 109 spores per ml of F. semitectum. The earlier instars were more susceptible to fungal infection than the later stages. Among the seven treatments evaluated under greenhouse conditions, the combination of F. semitectum at 4.60 x 109 spores per ml + dicofol 0.03 per cent recorded the highest mortality of 66.30 per cent where as dicofol alone recorded the mortality of 87.26 per cent.


Keywords


Aphis gossypii, Fusarium semitectum, okra

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