in vitro growth, sporulation and germination of five strains of Metarhizium and their virulence on Bemisia tabaci eggs and nymphs
DOI:
https://doi.org/10.33885/sf.2011.3.1076Keywords:
biological control, entomopathogenic fungi, whiteflyAbstract
In vitro growth, sporulation and germination of four wild and one commercial strains
of Metarhizium and their virulence on Bemisia tabaci eggs and second instar nymphs under
laboratory and greenhouse conditions were evaluated. The radial growth of the colony was
significantly lower for MaSin strain (0.30 cm/day). The sporulation was significantly higher in
6 6 MaSin (8.5x10 conidia/ml) and MaCol strains (6x10 conidia/ml). The conidial germination was
not significantly different between the strains evaluated. The virulence of the Metarhizium
strains on B. tabaci was evaluated by immersion of leaves that contained eggs or nymphs in
7 conidial suspension (1 x 10 conidia/ml). There was no significant difference on mortality of eggs
under laboratory (9.9-32.2%) or greenhouse (18.7-30.7%) conditions by the effects of the
Metarhizium isolates. There was no difference either on mortality of nymphs (67.7-88.2%) by
the effects of the strains in laboratory conditions. However, in greenhouse conditions, MaSan
and MaCol strains caused significantly higher mortality, with values of 60 y 50.5%, respectively.
These results indicated that all strains are more virulent for nymphs than for eggs of B. tabaci.
MaSan and MaCol strains could be potential candidates for the management of B. tabaci.
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