Efeito do feromônio de alarme do percevejo verde, Nezara viridula (L.) (Hemiptera: Pentatomidae), sobre o fungo entomopatogênico Metarhizium anisopliae (Mestch.) Sorok.

Abstract

Effect of the Alarm Pheromone of the Southern Green Stink Bug, Nezara uiridukx (L.) (Hemiptera: Pentatomidae) on the Entomopathogenic Furigi Meta rhizi u in anisopliae (Metsch.) Sorok.The effect of the alarm pheromone extract of the southern greeri stink bug, Nezara uiridula (L.), and some of the synthetic pherornone fractions, were evaluated agairist the eritomopathogenic fungus, Metarhizium anisopliae (Metsch.) Sorok. It was obscrved an irreversible inhibition on the germination of M. anisopliae spores, owing to the compounds trans-2decenal and trans-2-hexenal. These compounds are reported as fungal inhibitors or fungicides.

Selection of entomopathogenic fungi to control stink bugs and cotton boll weevil1

“…Studies conducted with M. anisopliae BRM 2335 (tested in our studies) by Silva et al (2015) demonstrated that the differential susceptibility of the rice stalk stink bug T. limbativentris to fungus infection was age-specific (early instar nymphs were more susceptible than late instars and adults) and partly mediated by fungistatic properties of aldehydes (E)-2-hexenal, (E)-2-octenal and (E)-2-decenal, which were produced by scent glands of both nymphs and adults. Other studies conducted with N. viridula, an important stink bug of soybean, showed similar results related to fungistatic compounds (Borges et al 1993, Sosa-Gómez et al 1997.…”

“…In the case of some fungal infections, several species of stink bugs deploy biochemical barriers (aldehyde production) that are quite efficient (Sosa-Gómez et al 1997, Sosa-Gómez & Moscardi 1998, Pike 2014, Silva et al 2015. These chemicals affect spore adhesion and germination, vegetative growth and sporulation (Borges et al 1993, Sosa-Gómez et al 1997, Lopes et al 2015, Silva et al 2015, Pedrini 2018). Studies conducted with M. anisopliae BRM 2335 (tested in our studies) by Silva et al (2015) demonstrated that the differential susceptibility of the rice stalk stink bug T. limbativentris to fungus infection was age-specific (early instar nymphs were more susceptible than late instars and adults) and partly mediated by fungistatic properties of aldehydes (E)-2-hexenal, (E)-2-octenal and (E)-2-decenal, which were produced by scent glands of both nymphs and adults.…”

Inter- and intraspecific variation in defensive compounds produced by five neotropical stink bug species (Hemiptera: Pentatomidae)

“…These semiochemically mediated interactions with natural enemies show that understanding the variability in the production of these compounds, and their effects on predators and parasitoids could be important in determining the potential success of biocontrol strategies. Pentatomid species differ in their susceptibility to entomopathogenic fungi, with E. heros being less susceptible than P. guildinii or N. viridula (Sosa-Go´mez and Moscardi, 1998), and it has been shown that two components of the exocrine secretions of N. viridula, (E)-2hexenal and (E)-2-decenal, inhibit spore germination and mycelial development of this fungus (Borges et al, 1993). It is possible that components of the exocrine blend contribute to these differences in susceptibility.…”

“…For example, there is evidence that (E)-2-hexenal, (E)-2-decenal and (E)-2-octenal are attractive to parasitoids in the genus Telenomus both in the laboratory (Laumann, Moraes and Borges, unpublished data) and in the field (Borges and Aldrich, 1994;Peres, 2004). Thus, quantitative knowledge of similarities and differences within and between species could prove to be important when designing control strategies using natural enemies, including entomopathogenic fungi, since some compounds have fungicidal activity (Borges et al, 1993).…”