Effect of Natural Phytosanitary Products on Beauveria bassiana
(Bals.) Vuill. in vitro
Natalia Ramos Mertz, Luís F. Angeli Alves, Angelina
M Marcomini, Daian G. Pinto de Oliveira, Juliana C. dos Santos
Abstract
The associated use of natural
products with entomopathogenic fungi can be an efficient strategy to
pest and
disease control and to reduce the environmental impacts, however, these
products can act adversely against the fungi, affecting its vegetative
growth, conidiogenesis,
viability and
pathogenicity. In view of the above, were evaluated the in
vitro effects of the commercial products Agro-mos®,
Ecolife® and Dalneem®
(concentrations 0.25; 0.5; 1; 2 and
4%) and the plant extracts of Curcuma
longa (Zingiberaceae),
Cymbopogon citratus and Cymbopogon nardus (Poaceae) (1; 5; 10;
15 e 20%) against Beauveria bassiana,
which were mixed in a Potato Dextrose Agar (PDA) medium, into Petri
dishes.
Were verified the micelial growth, the conidiogenesis and the conidia
viability, besides the fungi pathogenicity, when produced in contact
with these
products, against Galleria mellonella (Lepidoptera:
Pyralidae) caterpillars. The commercial products affected all the
parameters,
being toxic in all concentrations and the plant extracts reduced the
viability
in at least 50% when compared to the control. Curcuma
longa was compatible to fungi in the 1% concentration, Cymbopogon citratus was compatible until
15% and Cymbopogon nardus until 10%
and all of them did not affect the fungi virulency. The results prove
the
necessity of such studies in order to do not affect the action of
biological
control agents.
Key
words
- compatibility, entomopathogenic fungi, vegetable
extracts, Agro-mos®, Ecolife®.
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