The fungistatic and fungicidal effects of volatiles from metathoracic glands of soybean-attacking stink bugs (Heteroptera: Pentatomidae) on the entomopathogen Beauveria bassiana

Journal of Invertebrate Pathology
Rogério B LopesMarcos Faria

Abstract

This study was initially designed to evaluate the differential susceptibility of three soybean-attacking pentatomids to the entomopathogenic fungus Beauveria bassiana in standardized bioassays. Euschistus heros (Eh) was shown to be significantly less susceptible than Chinavia ubica (Cu), whereas Dichelops melacanthus (Dm) adults were highly susceptible to fungal infections. A deeper look at the mechanisms involved in the possible role of volatiles from metathoracic glands on fungal infections was undertaken, and gland extracts from Nezara viridula (Nv), a species known for its resilience to fungal infections, were also included in the assays. Atmospheres with volatiles from pentatomids with very low-susceptibility to B. bassiana infections (Eh and Nv) had a significant effect on speed of germination as shown in counts performed up to 22h post-inoculation, by which time 0.1 (control), 0.6 (Dm), 17.9 (Cu), 32.6 (Eh), and 43.4% (Nv) of conidia had not germinated. The fungistatic (inhibitory) and fungicidal (lethal) effects of Eh and Nv volatile-rich atmospheres were subsequently quantified in Petri dishes with either PDA or PDA medium amended with carbendazim, which allowed germination rates to be determined at 18 and 48h post-ino...Continue Reading

References

Jun 14, 2006·Proceedings. Biological Sciences·Hermógenes Fernández-MarínWilliam T Wcislo
Jul 19, 2006·Clinical Microbiology Reviews·Håvard JenssenRobert E W Hancock
Oct 24, 2007·Journal of Invertebrate Pathology·Aya YanagawaSusumu Shimizu
Feb 1, 2008·Journal of Chemical Ecology·Jürgen GrossAndreas Vilcinskas
Jun 29, 2011·Journal of Insect Physiology·Casey HamiltonMark S Bulmer
Aug 24, 2012·Journal of Chemical Ecology·Carla F FávaroPaulo H G Zarbin
Jan 1, 2013·Journal of Invertebrate Pathology·Rogério B LopesMarcos Faria
Jan 13, 2015·Journal of Invertebrate Pathology·Marcos FariaStephen P Wraight
Mar 26, 2015·Journal of Invertebrate Pathology·Rodrigo Alves da SilvaPedro Henrique Ferri

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