Effects of the fungus <Emphasis Type="Italic">Lecanicillium lecanii</Emphasis> on survival and reproduction of the aphid <Emphasis Type="Italic">Schizaphis graminum</Emphasis> |
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Authors: | Sonia Ganassi Pasqualina Grazioso Antonio Moretti Maria Agnese Sabatini |
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Institution: | 1.Dipartimento di Biologia Animale,Università di Modena e Reggio Emilia,Modena,Italy;2.Istituto Scienze delle Produzioni Alimentari (ISPA), CNR,Bari,Italy |
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Abstract: | This study investigated the effects of a strain of the fungus Lecanicillium lecanii (Zimm.) Zare and Gams (Hypocreales: Ascomycota) on the aphid Schizaphis graminum (Rondani) (Hemiptera: Aphididae). The fungus was administered to fourth instar nymphs and to alate and apterous adult morphs
as a ground rice-kernel formulation. This study showed that L. lecanii formulation affected the survival of the aphids and interacted differently with the studied morphs, the Lethal Time values
being lower for alate compared to apterous morphs and nymphs. The treatment also caused a significant reduction in the fecundity
of the three treated aphid groups. Histological analysis revealed that the hyphae invaded the host hemocoel of a limited number
of alate and apterous morphs: the fungus only entered through the spiracles. Scanning Electron Microscope observations revealed
that L. lecanii adhered to the body surface of both adults and nymphs without differentiation. In conclusion, the present study suggests
that this strain might be a good candidate for a programme of biological control of S. graminum and other aphid species. |
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