Compatibility of Beauveria bassiana with acaricides

Abstract

Compatibilidade de Beauveria bassiana com AcaricidasRESUMO -Visando avaliar a compatibilidade in vitro, entre o fungo entomopatogênico Beauveria bassiana (Bals.) Vuil. e acaricidas, 12 formulações com os ingredientes ativos clorfenapir, fenpiroximate, amitraz, acrinatrim, hexitiazox, abamectina, piridine, dimetoato, piridaphetion, óxido de fenbutatim, azociclotim e cihexatim, foram testadas em três concentrações (concentração Média -CM, metade da CM e duas vezes a CM). Para os parâmetros germinação de conídios, crescimento vegetativo e esporulação, apresentaram diferenças significativas na compatibilidade entre o fungo e as formulações utilizadas. As formulações mais compatíveis com o fungo, para os parâmetros avaliados, foram as pertencentes ao grupo químico da avermectina e piretróide. As formulações pertencentes ao grupo químico do organofosforado e organostânico afetaram drasticamente a germinação de conídios, bem como o crescimento vegetativo e a esporulação. PALAVRAS-CHAVE: Seletividade, fungitoxicidade, fungo entomopatogênico, MIPABSTRACT -The in vitro compatibility of the entomopathogenic fungus Beauveria bassiana (Bals.) Vuil. with 12 acaricide formulations was evaluated. The active ingredients Clorfenapyr, Fenpyroximate, Amitraz, Acrinathrin, Hexythiazox, Abamectin, Pyridine, Dimethoate, Pyridaphethion, Fenbutatin Oxide, Azocyclotin and Cyhexatin were tested in three different concentrations (mean concentration -MC, half MC and twice the MC). The formulations tested affected conidial germination, vegetative growth and sporulation of the fungus in different levels. The formulations more compatible with B. bassiana were Avermectin and the pyrethroids. The acaricides belonging to the organophosphate and organostanic chemical groups, however, drastically affected conidial germination as well as vegetative growth and sporulation.

Compatibility of Metarhizium Anisopliae (Ascomycota: Hypocreales) with Several Insectisides

“…In the authors opinion germination inhibition decreases the efficiency of pathogena as biocontrol agent, either of those already occurring in the agro-ecosystem or those applied by overflow, associated or not to pesticide products. De Olivera and Neves (2004) evaluated compatibility of B. bassiana with 12 acaricides and showed that Avermectin and the Pyrethroids were more compatible with B. bassiana than the others. This knowledge should facilitate the choice of chemicals with or less harmful to naturally occurring or artificially inoculated beneficial fungi.…”

In vitro susceptibility of nematophagous fungi to antiparasitic drugs: interactions and implications for biological control

“…In vitro test techniques that evaluate compatibility of chemicals with entomopathogenic fungi usually make use of different serial dilutions of the chemicals added to a culture medium, making the method both laborious and costly (Oliveira and Neves, 2004;Barci et al, 2009;Asi et al, 2010). This study, however, used the broth dilution method based on (CLSI -M38A).…”

Effect of Disinfectants and Pesticides Used in Poultry Houses on Beauveria Bassiana (Bals.) Vuill.fungus

“…The objective of the applied methodology was to simulate actual conditions of fungus exposure to the chemical products, as indicated by Oliveira & Neves (2004), and therefore, the responses obtained in the present experiment actually express the interaction between the fungus and the products and their impact on the evaluated parameters.…”

“…Leger et al, 1991). Germination may also be reduced when certain molecules bind to receptors in the fungal cytoplasm, affecting membrane permeability and enzyme synthesis, changing conidial metabolism (Moore-Landecker1982; Ghini & Kimati 2000;Oliveira & Neves, 2004).…”