Pathogenicity of the fungs Beauveria bassiana (bals.) vuill to the red palm weevil, Rhynchophorus ferrugineus (oliv.) (col.: curculionidae) under laborratory and field conditions [electronic resource].

By: Contributor(s): Description: P.81-85Uniform titles:
  • Egyptian journal of biological pest control, 2009 v. 19 (1) [electronic resource].
Subject(s): Online resources: In: Egyptian Journal of Biological Pest Control 2009.v.19(1)Summary: Pathogenicity of the entomopathogenic fungus, Beauveria bassiana (Bals.) Yuill. to the red palm weevil,Rhynchophorus ferrugineus (Oliv.) was studied using a local strain "UAE-B2" in United Arab Emirates. For adult weevils, the calculated LCso was 6.3x106 conidia /ml. Duration of the parasitic phase of the fungus was 9.6 days. Most of insects died between the 8th and 13th days. In the first 6 days after contamination, no symptoms were observed. In the 7th day, diseased adults appeared sluggish in their movement and the insects were unable to get up of their back. Larvae differed in their susceptibility to infection due to their age. The young instars were more susceptible than the old ones. In adult and larval stages, the fungus remains dormant inside the cadavers and starts to continue its saprophytic development when RH approaching 100%. For adults, duration of the saprophytic phase was 14.1 days and the fungus successfully developed on 81.5% of the dead insects. Complete mycosed cadaver produced 2.12 x 109 conidia. For young larval instars, duration of the saprophytic phase was 6.6 days and the fungus successfully developed on 85.7% of the dead larvae. Complete mycosed cadaver produced 4.3 x 107 conidia. Release of the fungus in a date palm plantation by two application methods caused a mortality of 12.8-21.2% and 23-47.1% in adult population in 2005 and 2006 seasons, respectively. The results lead to better understanding of the biology and pathogenicity of Beauveria bassiana as a biological control agent against the red palm weevil.
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Pathogenicity of the entomopathogenic fungus, Beauveria bassiana (Bals.) Yuill. to the red palm weevil,Rhynchophorus ferrugineus (Oliv.) was studied using a local strain "UAE-B2" in United Arab Emirates. For adult weevils, the calculated LCso was 6.3x106 conidia /ml. Duration of the parasitic phase of the fungus was 9.6 days. Most of insects died between the 8th and 13th days. In the first 6 days after contamination, no symptoms were observed. In the 7th day, diseased adults appeared sluggish in their movement and the insects were unable to get up of their back. Larvae differed in their susceptibility to infection due to their age. The young instars were more susceptible than the old ones. In adult and larval stages, the fungus remains dormant inside the cadavers and starts to continue its saprophytic development when RH approaching 100%. For adults, duration of the saprophytic phase was 14.1 days and the fungus successfully developed on 81.5% of the dead insects. Complete mycosed cadaver produced 2.12 x 109 conidia. For young larval instars, duration of the saprophytic phase was 6.6 days and the fungus successfully developed on 85.7% of the dead larvae. Complete mycosed cadaver produced 4.3 x 107 conidia. Release of the fungus in a date palm plantation by two application methods caused a mortality of 12.8-21.2% and 23-47.1% in adult population in 2005 and 2006 seasons, respectively. The results lead to better understanding of the biology and pathogenicity of Beauveria bassiana as a biological control agent against the red palm weevil.

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