Pathogenicity of the entomopathogenic fungi Beauveria bassiana (Balsamo)‎ and Verticillium lecanii (Zimmerman)‎ against aphid Macrosiphum rosae, Linnaeus (Hemiptera : Aphididae)‎ under laboratory conditions

الملخص EN

The effects of two entomopathogenic fungi, Beauveria bassiana and Verticillium lecanii were studied on aphid adults of Macrosiphum rosae under laboratory condition (25 ± 1 ºC, 80 ± 5% RH and a photoperiod of 12 L: 12 D h).

Bioassay was conducted by putting 1 μl from each concentration on insect body by micro-applicator as topical application method.

This experiment was conducted with six replications on CRD design.

Laboratory bioassay studies were carried with six different concentrations (104, 105, 106, 107, 108 spore/ml) of B.

bassiana and L.

lecanii on adult aphids of M.

rosae.

The LC50 values L.

lecanii and B.

bassiana were obtained 1.38 ×104 and 2.66 ×105 spores/ml, respectively.

The LT50 values ranged from 1.80 to 3.05 days with L.

lecanii concentrations and from 2.30 to 3.16 with B.

bassiana concentrations on adult aphids.

Results showed that LC50 and LT50 values L.

lecanii were lower than B.

bassiana.

Therefore, L.

lecanii has higher virulence compared with B.

bassiana on adult aphids of M.

rosae.