Environmental Entomology (1990) 19, 1163-1167

Irena Majchrowicz, Tadeusz J. Poprawski, Pierre-Henri Robert and Nguya K. Maniania (1990)
Effects of entomopathogenic and opportunistic fungi on Delia antiqua (Diptera: Anthomyiidae) at low relative humidity
Environmental Entomology 19 (4), 1163-1167
Abstract: The pathogenicity of Beauveria bassiana (Balsamo) Vuillemin and Paecilomyces fumosoroseus (Wize) Brown and Smith to the onion maggot, Delia antiqua (Meigen), was studied at 50% RH in the laboratory. Conidiospores of P. fumosoroseus sprayed on puparia of the onion maggot at the concentration 1 x 10⁸ ml^-1 (= 4 x 10⁵ cm^-2) increased pupal mortality to 47.5% as compared with 6.6% in the controls. There was no latent effect on adults that emerged from treated puparia. Spores of B. bassiana sprayed at the same concentration had no effect on pupal and adult mortality. Sixteen additional species of fungi were recovered from test puparia during reisolation of B. bassiana and P. fumosoroseus. Species from the genera Aspergillus, Fusarium, Geotrichum, Penicillium, Mucor, and Scopulariopsis were isolated, A. clavatus Desmazières being the most common among them. This fungus grew faster than the entomopathogens in vitro and might have inhibited their action in vivo.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Nguya K. Maniania

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
environment/habitat manipulation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Delia antiqua
Beauveria bassiana (entomopathogen)	Delia antiqua
Cordyceps fumosorosea (entomopathogen)	Delia antiqua